1000 Sentences With "dorsal fin" | Random Sentence Generator

My back hurts and I have grown an early-onset dorsal fin.

"The dorsal fin 2015/2017 comparison photo shows the mother's dorsal fin from 2015 and 2017 which helped us confirm it was the same dolphin we'd spotted in Monterey Bay in both 2015 and 2017," she told Gizmodo.

Then, the crew cinched the SmartTag in place around the shark's dorsal fin.

It seems to have a grayish body, a white belly and a dorsal fin.

They have small eyes, up to 4 inches of blubber, and no dorsal fin.

At first, Charlie hires an avuncular softy (hilariously portrayed by Alan Alda) to represent him, but then is convinced to go with Jay (a fearsome and funny Ray Liotta), a shark all too willing to go dorsal fin-to-dorsal fin with Nora.

The dorsal fin coloration of the male is a circular red spot ringed with blue.

The dolphin, which lacks a dorsal fin, appears black with a white streak on its underbelly.

Lydia, a great white shark, has worn a satellite tracker on her dorsal fin since 2013.

Rosetti Superyachts' newest concept design mimics the appearance of a killer whale, down to the dorsal fin.

By the time beachgoers caught sight of the sleek dorsal fin bisecting the water, it was too late.

He was perched on the top of the Farley Mowat when he saw a vaquita's dorsal fin slowly surface.

When the shark's dorsal fin emerged, I thought I had the shot but hesitated a fraction of a second.

Every white cap is a head sticking out of the water, every piece of flotsam is a dorsal fin.

Observers spotted an adult vaquita last year and again this year, identified by distinctive markings on the dorsal fin.

It looks like a shark's dorsal fin, spiking in the teenage years and then long-tailing off to the left.

Up to about 14 inches (35 cm) long, it had a vertical tail fin and a long, narrow dorsal fin.

These now-extinct sharks featured exaggerated and oddly shaped dorsal fin spines, some resembling sailing booms and others ironing boards.

The team believes the twins did not survive long after they were born, since their dorsal fin was not yet erected.

It will have four decks, an extended tail with a helipad, and an elongated radar mast to symbolize a dorsal fin.

Mr. Miranda poked a tweezer through the big fish's gills, pressed down the smaller fish's lodged dorsal fin and extracted the fish.

Most bluegills (and occasionally some of their hybrids) also sport a dark spot on the trailing edge of their soft dorsal fin.

Its dorsal fin and tail flukes appeared soft and flimsy, and its mother was still excreting some blood, according to a press release.

By outfitting them with special dorsal fin tags, scientists are able to follow the sharks in real time, for up to a decade.

The dorsal fin coloration of the male is a circular red spot ringed with blue which scientists said reminded them of Obama's campaign logo.

Vaquitas, which translates to "small cow" in Spanish, have a gray or white complexion, a tall dorsal fin, dark eye rings, and long flippers.

Earlier this month, a saltwater fish discovered in Hawaii was named after Obama because its dorsal fin coloration was reminiscent of his campaign logo.

After the research team collected some samples, they attached a satellite tag to the shark's dorsal fin and released her, hoping to track her recovery.

It was about the size of a squished bread loaf, with a razor-sharp front dorsal fin and dark, tigrine stripes covering its shimmering bronze body.

Basically, whenever I catch a shark I implant a tag at the base of the dorsal fin, record some data on the shark, and quickly release it.

Throughout that evolution, from the same family as pufferfish, its dorsal fin and anal fin fused together, giving it the appearance of a giant head with fins.

Ocearch traces the path by plotting the pings that occur every time Mary Lee's dorsal fin surfaces; it is tagged with a device linked to a satellite.

Subtle at first, then swelling into a filmy dorsal fin, slight but proud, that follows the spine down to the end in the sweep of a curled tail.

The shark violently shakes as it tries to make its way back into the water below, but its long dorsal fin keeps it from slipping back into the ocean.

But he was starting to panic about losing the $20133,000 accessory called a SmartTag that the shark was wearing around its dorsal fin, like a giant, bright orange Fitbit.

Wapner told the Tribune that he believes the shark was a great white, and estimated it to be about 15 feet in length with an 18-inch dorsal fin.

The video then cuts to the men—after having seemingly been able to squeeze the shark's dorsal fin through the railing— lowering the shark into the water with the rope.

Miss Costa has about 11,300 followers checking in on her whereabouts, which are sent to OCEARCH researchers by "pings" -- signals that emit from a tag on the shark's dorsal fin.

Compared to other dogfish, its distinguishing features include a longer body, a tighter gap between its eyes, a shorter caudal fin (its tail fin), and a differently proportioned first dorsal fin.

Photo: James H (Flickr)If movies were scientifically accurate, here's how Jaws would pan out: As the film's signature theme begins to play, a black dorsal fin slinks around the water's surface.

Although it had a typical melon-headed whale's dorsal fin shape and dorsal cape, it was also blotchy in pigmentation and had a sloping forehead, more reminiscent of a rough-toothed dolphin.

Most deceiving: The three-spined stickleback, a tiny but incredibly ferocious fish with three very sharp spines beneath its dorsal fin that can be used, like knives, as a weapon against predators.

What made Davidson and his fellow Eden whalers so unusual was their collaboration with a pod of killer whales, or orcas, each one recognizable by the nicks and scars on its dorsal fin.

He explained it's the large dorsal fin and its location in respect to the pectoral fins that suggests it is a sandbar shark, as the features are not consistent with a bull shark.

"The startling, very white coloration, the cleft upper lip, the absence of a dorsal fin, the beautiful way it moves, and the shape of its head," he said, "it's without a doubt a beluga whale."

The whale also had older, linear scars on its dorsal fin and tail flukes, suggesting it may have been entangled in a net or suffered some other interaction with human activity earlier in its life.

A satellite-linked transmitter is visible on the dorsal fin of L87, an orca from the southern resident group of killer whales, while swimming in Puget Sound in view of a state ferry west of Seattle.

Another symptom of boredom: I saw the whales float motionless for hours upon hours every day, leading, among other things, to complete dorsal fin collapse on 100 percent of all captive adult males and even some females.

Image: Rebikoff Foundation/Science AAAS/YouTubeDeep sea anglerfish look like some kind of tragic holdover from the Precambrian Era, with their large head, dead eyes, fang-like teeth, and glowing "fishing rod" that extends from their dorsal fin.

The Black Car has a roofline similar to what is known of that rather mysterious Atlantic, including a dorsal fin running down the center; the horse collar grille; and the signature swoop of the passenger compartment's side windows.

If you're more of a shark person, you can watch a great white shark hunting through a kelp forest for its next meal (and maybe even feel like one, too — the camera is attached to the shark's dorsal fin).

Because the shirt is covering the dolphin's dorsal fin, the wildlife officers can't tell if the animal was previously tagged, nor can they identify it from a set of local dolphin photos (dorsal fins are like fingerprints—no two are the same).

Since then, Mary Lee, named after the mother of Ocearch founder Chris Fischer, has travelled more than 40,000 miles, according to the New York Times, helping Ocearch understand more about great whites by sending a ping with her location from a tracker on her dorsal fin to a satellite.

So, we designed an experience with these scientists at its heart; and it led to the almost unbelievable discovery of a new species — the 'type D killer whale' with a pointer dorsal fin and a smaller white patch by its eye — during one of our trips to Antarctica.

Generation Zero, Bannon's delirious 2010 documentary about the decay of American ideals, features, within its first six minutes: scenes of robbery, fiery plane crashes, heavy rain, emoji-faced men with their tongues wagging at money, handshakes in back alleys, incinerated houses, the boat sail-size dorsal fin of an approaching shark.

Scales on the body are ctenoid. The first dorsal fin is elongated and separated from the second dorsal fin. Both have a stiff first spine. The second dorsal fin and the anal fin are roughly the same size.

The first dorsal fin is long-based and triangular, with the apex almost forming a right angle; the second dorsal fin is some two-thirds as high as the first. The origin of the first dorsal fin lies over the pectoral fin insertions, while that of second dorsal fin lies over the pelvic fin rear tips. No ridge exists between the dorsal fins. The anal fin is smaller than the second dorsal fin and has a strong notch in the rear margin.

Juveniles are dark with a red nape, upper back and spiny dorsal fin, and a dark ocellus at the rear base of the dorsal fin.

The dorsal fin continuous with a very short first spine, there are a 10 spines which progressively become higher towards the tail, the first rays in the soft-rayed portion of the dorsal fin is only slightly higher than the spiny portion giving the dorsal fin an almost straight profile. The soft-rayed part of the dorsal fin contains 26-28 soft rays. The anal fin has 3 spines and 27-28 soft rays. The soft portion of the dorsal fin is notably longer than they spiny portion.

The spiny dorsal fin is placed halfway down the body and is detached from the soft dorsal fin. The soft dorsal fin extends down the body and ends shortly before the caudal fin. The anal fin mirrors the soft dorsal fin down the underside of the body before the caudal fin. The shape of the caudal fin varies based on family, but is generally either rounded, forked or truncate.

The pectoral fins are moderate in size, with somewhat pointed tips and nearly straight trailing margins. The pelvic fins are small, with short claspers in males. The first dorsal fin has a narrowly curved apex, while the second dorsal fin is much smaller and lower. The first dorsal fin origin lies over the rear half of the pelvic fin bases, while the second dorsal fin origin lies slightly behind the anal fin origin.

The fins are all hyaline in appearance except for the dorsal fin which becomes dusky terminally with 5 or 6 rows of dusky spots on the soft dorsal fin membrane.

The preoperculum is hooked and has four spines, on pointing forwards and the remaining three point backwards. There are two high dorsal fins, taller in males than in females, and the first dorsal fin in males is a little higher than the second dorsal fin. The first dorsal fin has four rays and the second has 9-10 rays. The anal fin is similar in size to the second dorsal fin and it has a long tail.

This male (Tilikum), at SeaWorld Orlando, had a collapsed dorsal fin. Most captive male killer whales, and some females, have a dorsal fin that is partially or completely collapsed to one side. Several hypotheses exist as to why this happens. A dorsal fin is held erect by collagen, which normally hardens in late adolescence.

Head and body reddish orange and white ventrally. First dorsal fin dark red in color with second dorsal fin red with black marking. Pectoral fin bright red. A symphyseal knob on the lower jaw absent.

The second dorsal fin is very long and sickle-shaped. The fish grows up to 50 cm long. The second dorsal fin is longer and sickle-shaped. Its dorsal fins have bony, knife-like spines.

Dorsal fin of the Phaeton dragonet with the typical black blotch.

The dorsal fin has a large spine with retrorse serrations behind.

There is a strong dark horizontal stripe along the midline, and sometimes a thinner dark band about half-way between the midline band and the base of the dorsal fin. There are often dark blotches along the base of the dorsal fin. Faint dark vertical bars can sometimes be seen on the flanks. The tip of the dorsal fin is edged in red.

The dorsal fin is continuous and there is almost no difference in form between the spiny and rayed parts of the dorsal fin. The spiny part is about a third longer than the rayed portion. The spines become longer towards the trail and the soft rays are noticeably longer than the spines. The soft-rayed part of the dorsal fin is rounded.

The dorsal fin of the males can become long and flowing. Both sexes have the eye-catching blood-red spot in the pectoral area. Both also have the black and white patch on the dorsal fin.

These spines are very noticeable in males, and resemble a dorsal fin.

Ariosoma Sokotranum's dorsal fin originates slightly anterior to base of the pectorals.

The first bar is on the nape, the third bar runs through a dark brown or black blotch on the body at base of rearmost 3 spines of the dorsal fin while the final bar is on the caudal peduncle. These dark bars reach the base of dorsal fin. The margin of the dorsal fin is yellow or orange with a line of dusky yellow or orange spots along middle of spiny part of that dorsal fin and another along base of the fin. These rows have one spot on each membrane.

River blackfish are elongated with a rounded body, distinct snout and large mouth, and small to moderate sized eyes. The caudal fin, soft dorsal fin and anal fin are rounded. The spiny dorsal fin is low, weak and blends into the soft dorsal fin. Colour varies but is usually either yellow or green with dark green mottling, or a very dark purple/black colour.

Some individuals have 5 or 6 incomplete vertical bars extending from around the dorsal fin to the level of the pectoral fins. The fins are generally yellow in colour, with varied dusting and blotching. The spinous dorsal fin has irregular spotting and a faint duskiness distally, but does not exhibit a distinct patch of dark pigmentation. The soft dorsal fin is dusky at the base.

The first dorsal fin is tall and slightly falcate (sickle-shaped), originating behind the pectoral fin bases; its free rear tip lies over the origin of the pelvic fins. The second dorsal fin is smaller than the first, but still rather large, with a concave, trailing margin. The pelvic fins have nearly straight trailing margins. The anal fin is taller and longer than the second dorsal fin.

The pectoral fin allows them to turn left or right, they also support the stability of the fish (Aquaveiws, 2009). The dorsal fin helps aid the fish to make sharp turns and helps the fish in rolling (Aquaveiws, 2009). The dorsal fin on the garfish is located well back on the fish (Montgomery & Saunders, 1984). Unlike most fishes, the dorsal fin of the garfish lacks spines.

The ornate rainbowfish is a small, slender and rather elongated species of rainbowfish. It has two dorsal fins that are only narrowly separated, and the first dorsal fin is considerably smaller than the second. There are 3 to 5 thin, soft spines in the first dorsal fin while the second dorsal fin has 11–15 segmented rays. This species is highly variable in colour over its range.

The anal fin is about the same size as the dorsal fin. The white crappie has six dorsal fin spines, whereas the black crappie has seven or eight dorsal fin spines. White crappies are also slightly more elongated than black crappies. The white crappie is a deep-bodied fish with a flattened body, or a depth that is one- third of the length of the fish.

Abudefduf vaigiensis are white bluish with a yellow top. They have a black spot around their dorsal fin. It has yellow eyes. The dorsal fin on this fish has 13 dorsal spines and 11 to 14 dorsal soft rays.

It is characterized by its very long jaw, silvery belly, lateral stripe, and single dorsal fin. The dorsal fin is located directly above the anal fin origin.DeLancey, L. Anchoa mitchilli. Comprehensive Wildlife Conservation Strategy, South Carolina Department of Natural Resources. 2006.

The fish has one lateral line, one dorsal fin and one anal fin. There are ten spines and 14 to 16 fin rays on the dorsal fin and three spines and 11 to 13 fin rays on the anal fin.

The size of this fish is up to . Its body is compressed laterally and is endowed with a dorsal fin starting from the top of the head until joining practically the superior base of the caudal fin. When the dorsal fin is spread, it looks like a toothed crest. The 12 to 15 spines of the dorsal fin are venomous, and it has seven or eight soft rays.

There is a dusky band along the margin of the soft rayed portion of the dorsal fin except for a white tip on highest anterior part. The tip of the snout and the tip of the chain are blackish. The dorsal fin is deeply notched. There are 10 spines and 10-11 soft rays in the dorsal fin with 3 spines and 10-12 soft rays in the anal fin.

The medium-sized first dorsal fin originates just behind the pectoral fin rear tips. The second dorsal fin is about two-thirds as tall as the first, and there is no midline ridge running between them. The pelvic fins are broad and slightly larger than the anal fin. The anal fin has a strong notch in the trailing margin and is positioned slightly behind the second dorsal fin.

The anal fin is usually equal in length or longer than the dorsal fin.

It is somewhat distinctive for having a single long dorsal fin which leans back.

Males are smaller, more slender and have a more pointed dorsal fin than females.

The dorsal fin has become modified to a single spine located under the rostrum.

The pectoral fin has a shallowly concave posterior margin. The first dorsal fin is moderately high, and both dorsal fin spines are very stout. Coloration is light grey above, paler below, with no white spots. The pale dorsal fins have dusky tips.

The specific name otrynter is derived from Latin, and means a driver, in allusion to the whip-like ray of the second dorsal fin. The common names of the species, threadfin jack and thread pompano, also refer to the filamentous, threadlike dorsal fin.

The melon, which is not very prominent, slopes quite steeply to the short beak. The dorsal fin is triangular to slightly hooked, small, and rounded at the tip. The leading edge of the dorsal fin joins the body at a sharp angle.

Thread-sail filefish grow to a maximum adult length of about . The first dorsal fin is a strong retractable (folding backwards) spine. The second dorsal fin and anal fin are soft. They have comparatively small pectoral fins and truncated, fan-shaped tail fins.

However it does have a caudal and dorsal fin. Both are covered in similar scales.

The hana fusa or white pompom oranda is an elegant pompom with a dorsal fin.

All species have a dorsal fin to prevent themselves from involuntarily spinning in the water.

Tribodus is found to have dorsal fin-spines and head spines, though only in males.

The rest of it is gray, except for the area right under the dorsal fin.

It can be distinguished from congeners by the unique number of dorsal fin spines (18).

The species within Atherion are characterised by having rough, sharkskin-like denticles around the mouth and in other places on the head. The origin of the first dorsal fin is to the rear of the pelvic fin tip. The first dorsal fin has 3–6 spines while the second dorsal fin has a single spine and 8–13 soft rays. The anal fin also has a single spine and has 13–17 soft rays.

The margin of the dorsal fin is blue and orange and the caudal fin is dull yellow with diagonally converging blue and rose lines. The males and females are similarly patterned but males are larger than females. There is another black spot on the spine near the origin of the dorsal fin. The dorsal fin has 9 spines and 11 soft rays; the anal fin has 3 spines and 12 soft rays.

The Sandhills chub is a minnow that has a large mouth in a terminal position with a small flap-like barbel located on the corners of their mouths. It has nine dorsal fin rays and either has a light black spot or does not at the base of the dorsal fin. Their dorsal fin is located behind the pelvic fins. It has a slightly lunate caudal fin giving it a more curved fin.

The posterior angle of the maxillary extends beneath the anterior part of the eye, up to the middle of pupil. It possesses two rows of teeth in each jaw. The outer row of teeth inside the upper jaw is larger and more widely spaced, while the inner row is characteristically minute. The first dorsal fin is low, much in advance of the second dorsal fin but not reaching the second dorsal fin when depressed.

Fish of this family have dorsal fins covered by skin. An adipose fin is also present, and is fused with the caudal fin in some species. The dorsal fin base is short and the dorsal fin spine is weak. The anal fin base is short.

The dorsal fin is moderate in length and spans 2-4 trunk rings and 3-5 tail rings. In females, the dorsal fin is usually banded. The caudal fin is present and rounded. The anal fin is greatly reduced, and the pelvic fins are absent.

The dorsal fin is dark while the pectoral, pelvic and anal fins are orange. During the breeding season the male becomes very colorful with steel blue upper parts in front of the dorsal fin, lustrous green upper parts behind and deep salmon- pink underparts.

However, the bars of banded archerfish extend to the dorsal fin whilst those of the smallscale archerfish do not; they stop below the dorsal fin, with another dark spot on the fin itself. The smallscale is also has a shorter snout than other archerfish.

A small fish, with maximum recorded size of about 4.8 cm. Small unbranched supraorbital, nasal and nuchal cirri. Lip margins smooth. Deep notch in dorsal fin between spiny and rayed sections, dorsal fin attached to base of caudal peduncle by a membrane, anal fin free.

Its long dorsal fin consists of 19 dorsal spines. Between the spines and rays of the dorsal fin is a notch. The anal fin consists of 2 spines and 19 segmented rays. Both the dorsal and anal spines are long, often flexible, and longest anteriorly.

Zingel zingel is distinguished has two separate dorsal fins with 13-15 spines in the first dorsal fin and 18-20 soft rays in the second dorsal fin. There are no scales on the cheeks. They grow to in length with a maximum length of .

It has 10–13 spines in its dorsal fin and 12–15 in its anal fin.

There is a dark spot at origin part of dorsal fin. It feeds on small planktons.

A stout spine precedes the dorsal fin, and the forked caudal fin has equal sized lobes.

The first dorsal fin originates to the front of the pelvic fin and the second dorsal fin is located in front of the anal fin's insertion. They typically reach a maximum size of 68 cm in total length, but they average between 30 and 60 cm.

Mature females or young males only show the two black spots on the dorsal fin. Mature males display only the first black spot on the front of the dorsal fin, a lighter-colored spot just behind the eye and irregular greenish to pinkish lines on the face.

The dorsal fin contains 11 spines and 15-17 soft rays while the anal fin has 3 spines and 8 soft rays. The membranes between the dorsal fin spines are slightly incised. The caudal fin is rounded. There are 53-63 scales in the lateral line.

Chromis iomelas is split in color, being solid black from the middle of the dorsal fin to the nose, and solid white from the middle of the dorsal fin to the end of the caudal fin. It grows to a size of 8 cm in length.

The dorsal fin originates just over or behind where the pelvic fin originates. When depressed, the first dorsal fin extends beyond the last ray. The tip of the pelvic fin can reach beyond the origin of the pelvic fin. There are eight rays in the anal fin.

Sea chubs are easily recognized by distinct morphological characteristics such as their ovate-shaped bodies, small mouths, and weakly- forked strong caudal fin. A key characteristic also being a spinous dorsal fin with low spines followed by a higher evenly curved or falcate soft dorsal fin.

The caudal fin and the second dorsal fin have fine brownish bars. The mature males develop a depressed head and enlarged jaws. The first spine in the first dorsal fin is the longest and normally develops into a filament. It attains maximum size of in standard length.

Differentiating between the male and female three spot gourami is by the dorsal fin. In the male, the dorsal fin is long and pointed and the anal fin is pointed, while the female's are shorter and rounded. However, some females may have a dorsal fin as long as the male's. When ready to breed, the male builds a bubble nest and then begins to entice the female by swimming back and forth, flaring his fins and raising his tail.

There are 11 spines and 13-15 soft rays in the dorsal fin while the anal fin contains 3 spines and 9 soft rays. The membarnes between the dorsal fin spines have deep notches. The caudal fin has a rear margin which is convex in juveniles of standard lengths less than and is straight or concave in adults. The overall colour is dark brown with a black margin to the spiny part of the dorsal fin.

The species within Belonoperca are elongated, predatory fish that produce the toxin grammistin in the mucus on their skin.The two species in the genus have 9 spines in their dorsal fin, although B, chabanaudi may have 10, and both have 10 dorsal fin rays. Other members of the tribe Diploprionini have more dorsal fin rays than the species of Belonoperca. They also differ from related fishes in the arrangement of the spines and rays in the anal fin.

The body is slim and streamlined, with a very tall, narrow, and falcate (sickle-shaped) first dorsal fin that originates over the bases of the rather small pectoral fins. The second dorsal fin is much smaller and originates over the aft third of the anal fin base. The anal fin is about half again as long as the second dorsal fin. A lengthwise groove is on the caudal peduncle at the dorsal origin of the caudal fin.

This species has a moderately elongate and laterally compressed body. The lower jaw has a short sideways-projecting spine on either side near the tip. The dorsal fin has 15 to 21 soft rays and the anal fin has 14 to 17. The small pelvic fins are at the midpoint of the body, the origin of the dorsal fin is slightly behind this and the origin of the anal fin is below the centre of the dorsal fin.

Courtship includes the erection of the dorsal fin and the lowering of the pelvic and anal fins.

The juveniles use the elongated, detached front portion of their dorsal fin to impersonate drifting dead leaves.

Its greatest distinguishing characteristic from other mudskippers is its greatly reduced first dorsal fin in both sexes.

The pectoral fins and dorsal fin contain venomous spines; care should be used when handling this fish.

There is a large, round, dusky blotch directly below the first dorsal fin which sits beneath the lateral line at level of first dorsal fin, this blotch is similar in size to the eye. The lesser African threadfin can attain a total length of but is more normal.

The first dorsal fin is triangular, uncurved, and moderately sized, and the second dorsal fin is much smaller than the first and bears a large black patch at its apex. The whitecheek shark's dorsal (upper) surface is grey or brownish-grey, while its ventral (under) surface is pale.

The first dorsal fin is small and widely separated from the second. The second dorsal fin is roughly the same size as the anal fin. The pectoral and ventral fins are pointed and are about the same lengths. It has a whitish body with scattered tiny brown spots.

The pectoral fins are fairly small, narrow, and angular. The pelvic fins are small, with long, elongate claspers in males. The first dorsal fin has a rounded apex and originates over the posterior half of the pelvic fin bases. The second dorsal fin is much smaller and roughly triangular.

The coloration is grayish to brownish above and white below, with a pattern of scattered small, dark spots unique to each individual. The tips of the first dorsal fin and upper caudal fin lobe, and sometimes also the second dorsal fin and lower caudal fin lobe, are bright white.

This species is light grey to bronze above, darkening at the tips of the second dorsal fin and upper caudal fin lobe (though this may be indistinct in larger sharks), and pale below. The underside is off-white, and the first dorsal fin has a pale trailing margin.

The two species of Squaliolus are the only sharks with a spine on the first dorsal fin but not the second. The spine is sexually dimorphic, being typically exposed in males and enclosed by skin in females. The first dorsal fin is tiny and originates over the trailing margin of the pectoral fins. The second dorsal fin is low, with a base twice as long as that of the first, and originates over the anterior half of the pelvic fin bases.

Regalecus russelii can grow up to 8 meters in length, and it has two dorsal fin crests that can reach 1 meter high. The species can be distinguished by its red dorsal fin crests, light brown head, and scaleless, silver body. The body is covered by dermal tubercles, which are concentrated along the ventral and lower side regions of the body. Each dorsal fin has 333 to 371 rays, which shorten and then become longer at the middle of the body.

As with most of the genus Sillago, the Indian whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales extending to the cheek and head. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 21 to 22 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 22 to 23 soft rays posterior to the spines.

As with most of the genus Sillago, the bay whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales extending to the two rows of cheek scales and head. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 17 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 17 soft rays posterior to the spines.

This species grows up to 8 centimetres (3 in) total length. It is easily differentiated from all other cardinalfishes by its tasseled first dorsal fin, elongated anal and second dorsal fin rays, deeply forked caudal fin, and color pattern consisting of three black bars across the head and body and prominent black anterior edges on the anal and second dorsal fin. The male can be differentiated from the female by a conspicuous, enlarged oral cavity, which is apparent only when they are brooding.

Acanthobunocephalus nicoi is the only species of catfish (order Siluriformes) in the genus Acanthobunocephalus of the family Aspredinidae. This species is known from only three localities and appears to be restricted to the upper Orinoco River system of Venezuela and possibly the upper Rio Negro system of Brazil. Acanthobunocephalus nicoi can be differentiated from other aspredinids by the presence of a dorsal fin spine locking mechanism and a rigid dorsal fin spine. The lateral line is truncated at about the dorsal fin level.

Kyphosichthys (Greek for "bent fish") has a strongly arched hump between the head and the dorsal fin, from which its name derives. The holotype measures 96 mm in total length, and 76 mm in standard length. The greatest body height occurs at the posterior opercular margin, where the body height is over 70% of the standard length. The dorsal fin and anal fin are located far back on the body, the latter is only half as long as the dorsal fin.

The dorsal fin has ten to twelve soft rays, the anal fin fifteen and the pectoral fins twelve. The dorsal fin is shorter than the anal fin, and its origin is posterior to the origin of the anal fin. The fifth ray of the dorsal fin is the longest but is not as long as the second ray of the anal fin. This is modified in males into an "andropodium", a movable intromittent organ used to deliver milt into the female's genital opening.

The first dorsal fin originates over the posterior half of the pectoral fin bases. The second dorsal fin is about half as tall as the first and located over or slightly ahead of the anal fin. The anal fin is smaller than the second dorsal fin and has a deep notch in the rear margin. The caudal fin has a well-developed lower lobe and is preceded by a crescent-shaped notch on the upper side of the caudal peduncle.

Sphyraena chrysotaenia has a very elongated, torpedo-shaped body, typical of the barracudas, with two well- separated dorsal fins, the first dorsal fin has with five spiny rays, with the first ray being the longest, the rays then progressively decrease in size posteriorly. The second dorsal fin has its origin in front of the origin of the anal fin. The tail is markedly forked. The pectoral fin sits directly below the origin of the first dorsal fin with the pelvic fin below it.

Juveniles are white with a black spot on the dorsal fin and an orange band through the eye.

The membranes between dorsal fin spines have a yellow margin. This species attains a maximum total length of .

It can be distinguished from other darters by its unique front and rear spots on the dorsal fin.

The dorsal fin is short and possesses strong, serrated, fin spines, which are strong enough to inflict wounds.

Some spots are from dark green to black, the abdomen is somewhat grayish, and there is a circle outside. The turbot has a small amount of thorns on its surface, and its dorsal fin is hard and long, extending from the tip of the nose, with short rays and almost to the back. Both sides of the body are heavily scaled with small, and scales are deeply embedded in thick skin (73-86 along the side lines), scales on both sides cover lots of ventral surfaces. Its caudal fin is relatively small, similar in shape to the dorsal fin, and extends from the dorsal fin to the caudal fin at the same level as the dorsal fin.

This species is similar to the Tippecanoe darter but has scales on cheek behind the eye, 2nd dorsal under the 1st dorsal fin.. The golden darter has a gold margin to the 1st dorsal fin and the body is orange in color marked with vertical dark bars towards the tail.

The other fins have no distinctive markings, but do have pale posterior edges. The blackspot shark can be confused with the whitecheek shark (Carcharhinus dussumieri), but that species has a triangular first dorsal fin that is only slightly falcate, and a small second dorsal fin that merely has a dark margin.

Department of the Environment and Water Resources. Morphological differences include skull shape, presence or absence of a median dorsal groove in front of the dorsal fin, height of dorsal fin, and coloration. Genetic analysis constitutes a 5.9% difference between the two populations.Beasley, I., Robertson, K. M. and Arnold, P.. 2006.

Ventral part of caudal peduncle covered with plates showing a highly reduced number of odontodes. Dorsal-fin origin slightly anterior to pelvic-fin origin. Dorsal fin short; when adpressed, far from reaching preadipose unpaired plate. Adipose fin roughly triangular, preceded by one, or two fused into one, median unpaired raised plate.

The female is more full bodied and the male has a larger dorsal fin. The male is distinguished by longer extended dorsal and anal fins. The dorsal fin is elongated into a sickle shape that arches to the length of the tail base. The female has a shorter rounded fin.

The first dorsal fin is positioned closer to the pelvic than the pectoral fins, which are very short and broad. The second dorsal fin is much smaller than the anal fin. No ridge occurs between the dorsal fins. The back is bronze-gray in color, and the belly is white.

The pectoral fin spine is serrated anteriorly and posteriorly. The dorsal fin spine is serrated posteriorly but not anteriorly.

Dorsal fin has straight rear margins.Compagno, Leonard. "Sharks of the world." Shark Research Center Iziko-Museums of Cape Town.

Some individuals have dark blotches on the body or dorsal fin. Maximum recorded length if 76 cm (29.6 in).

The dorsal fin has 65–79 soft rays, the pectoral fin 10 to 11, and the ventral fin six.

The fins are all uniformly greyish, with some presence of dots on the rays of the second dorsal fin.

Kyhosus azureus has a moderately deep, compressed, oval body with a small head which has a pointed snout and a small, thickly lipped mouth. There is a continuous dorsal fin which contains 11 spines, which can be folded down into a scaly furrow, and 9 soft rays. The spiny part of the dorsal fin is longer than thesoft-rayed part. The anal fin has 3 spine and 10 The body is covered in thick, rough scales soft rays which are longer than those in the dorsal fin.

Like all sillaginids, the rough whiting has an elongate compressed body profile which tapers toward the small terminal mouth. The first spinous dorsal fin has 11 spines and the second dorsal fin has one spine and 17 soft rays. The anal fin has two spines and 17 soft rays. Between the base of first dorsal-fin spine and the lateral line 4 scales, although the amount of lateral line scales is not known, as is the case with vertebrae numbers, colour, and swim bladder morphology.

As with most of the genus Sillago, the Thai whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales extending to the two rows of cheek scales and head. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 21 to 22 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 21 to 22 soft rays posterior to the spines.

As with most of the genus Sillago, the Japanese whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales extending to the two rows of cheek scales and head. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 21 to 23 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 22 to 24 soft rays posterior to the spines.

As with most of the genus Sillago, the mud whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales extending to the two rows of cheek scales and head. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 20 to 22 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 21 to 23 soft rays posterior to the spines.

It takes its common name from a series of small black-brown rectangular blotches which become larger posteriorly on its back between the bases of the second dorsal fin rays. Also, a dark-brown, diffuse blotch is present on the operculum. The spinous dorsal fin is pale to dusky, while the second dorsal fin lobe is dusky with the ray tips yellowish. The anal fin distal margin is whitish-blue, and the caudal fin has a yellowish upper lobe and pale trailing edges and lower lobe tip.

The head is greenish with pink lines stretching to dots behind the eyes until the base of dorsal fin. A bright yellow spot appears at the border of the side and the dorsal fin. Some color variation occur with a possible black spot just behind the characteristic first yellow spot, and a second bright yellow spot can be seen along the edge of the dorsal fin but at the end of this later. In the Red Sea, half the back of some individuals may be colored blue.

240 pxAs with most of the genus Sillago, the trumpeter whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales, including the two rows of cheek scales. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 19 to 20 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 19 to 21 soft rays posterior to the spines.

Polydactylus sexfilis is a medium-sized species, which attains a maximum total length of and a weight of . It has a ponted snout and the head has an almost horizontal profile. There are two separated dorsal fins, the first dorsal fin has 8 spinesand the second dorsal fin contains a single spine and 12 or 13 soft rays. The anal fin has 3 spines and 11 or 12 soft rays, the base of the anal fin is roughly equal in length to the second dorsal-fin base.

The first dorsal fin is triangular with a rounded apex, originating in front of the pelvic fin insertions. The second dorsal fin is only one-half to two- thirds as large as the first; the distance between the dorsal fins is less than the length of the first dorsal fin base. The stout tail comprises about one-third of the total length, terminating in a caudal fin shaped like an equilateral triangle with slightly convex margins. The skin is soft and completely devoid of dermal denticles (scales).

Three broad diagonal bars run from its back down to its belly. The pectoral fins have three or four transverse rows of brown spots. Just behind the pectoral fins are a series of stripes. The first dorsal fin has two black or brown longitudinal bands, while the second dorsal fin has four.

The frillfin goby is a usually dark colored goby with mottled coloring of black, gray, and tan, but body color is variable between habitats. It has a thin, gray-green first dorsal fin and a trailing second dorsal fin of the same color. Its brown eyes are proportionally large. Its cheeks are large.

The western jumping blenny is identified from the allopatric but congeneric eastern jumping blenny by having a deep incision between the last spine of the first dorsal fin and the first spine of the second dorsal fin, as well as having two spines in the anal fin while the eastern has none.

This species has 9 spines in its dorsal fin, the first two of which are divided from the others by a notch. The dorsal fin also has 12 soft rays, while the anal fin has 3 spines and 12-13 soft rays. The largest males of this species attain a total length of .

The dorsal fin has 11 spines and 14-16 soft rays while the anal fin contains 3 spines and 9 soft rays. The membrane of the dorsal fin has deep indentations between the spines. The caudal fin is rounded with acutely angled corners. There are 72-76 scales in the lateral line.

Opercular opening extending above pectoral fin base. Pectoral fin soft rays 10 (rarely 11). Dorsal fin spines 2-6, isolated (with small triangular fin membrane), directed posteriorly and not inclined from middorsal line, and depressible in shallow groove. First dorsal spine shortest and last one longest. Dorsal fin soft rays 8-11.

The five pairs of gill slits are long and precede the pectoral fin bases. The pectoral fins are long and narrow. The first dorsal fin is large and high, with a rounded apex, and originating just behind the pectoral fin bases. The pelvic fins are much smaller than the first dorsal fin.

For example, in a fish, the pectoral fins are dorsal to the anal fin, but ventral to the dorsal fin.

They hide under small rocks for protection. They have a small black spot on the dorsal fin for easy identification.

Mackerels have a round body that narrows into the tail after the second dorsal fin, similar to a tuna fish.

Now named Knobble, so-called because of a knobble on his dorsal fin, the minke has become quite an attraction.

The pectoral fins are distinctively large and triangular, with rounded to pointed tips. The large first dorsal fin originates over the rear of the pectoral fin bases. The second dorsal fin is relatively tall and long, and originates over or slightly behind the anal fin origin. There is no ridge between the dorsal fins.

The pectoral fins, second dorsal fin, and lower caudal fin lobe are prominently tipped in black, while the first dorsal fin and dorsal caudal fin lobe are narrowly edged in black. The maximum size reached by the Pondicherry shark is uncertain due to a lack of large specimens, but is probably not much greater than .

The anal fins are a green or yellow-orange, the dorsal fin is an olive color, and the belly is cream-colored. The vertical bands fade as they near the belly. Spawning intensifies the bands in males, and they can be nonexistent in juveniles. The spiny anterior dorsal fin has 13 to 15 spines.

The tiny first dorsal fin originates about over the rear tip of the pectoral fin. The second dorsal fin is long and low, and originates over the front half of the pelvic fin bases. The pectoral fins are short with rounded margins, and the pelvic fins are long and low. The anal fin is absent.

The first dorsal fin has a slanting violet stripe, while the second dorsal fin is studded with small dark spots. The pectoral fin is also covered with small spots. The base of the anal fin and the rear portion of the ventral fins are black. The caudal fin has a stripe running through the center.

The body is strongly compressed laterally. The dorsal fins are situated approximately in the middle of the body. The first dorsal fin (with five to six rays) is arched and originates from the highest point of the back of the fish. It has thinner rays than the second dorsal fin (with seven to eight rays).

It has also two black ocellus: the first one on top part of its caudal peduncle and the second one in the middle of its dorsal fin. A black spot occurs on the first rays of the dorsal fin. Juveniles and females have in common an orange anal fin. Mature male are quite different.

The pectoral fins are large and broad, with gently concave posterior margins. The first dorsal fin is rounded and originates over the forward half of the pelvic fin bases. The second dorsal fin is much smaller and somewhat triangular, originating over the anal fin. The pelvic fins are small; males have very long claspers.

Around 61 (or 52–72) gill rakers can be counted, and the dorsal fin rays consist of one spine and 17 (or 15 to 18) soft rays. The anal fin has one spine and five soft rays. The basal length of the dorsal fin is rather long. The total length is 2.7× the body depth.

Dorsal fin diagram with landmarks labeled. Most sharks have eight fins: a pair of pectoral fins, a pair of pelvic fins, two dorsal fins, an anal fin, and a caudal fin. The members of the order Hexanchiformes have only a single dorsal fin. The anal fin is absent in the orders Squaliformes, Squatiniformes, and Pristiophoriformes.

Heniochus chrysostomus from French Polynesia The threeband pennantfish is a small-sized fish that can reach a maximum length of 18 cm. The body is laterally strongly flattened, with a basic white color and three broad oblique brown bands. The first dark brown band runs from the forehead up to the ventral fins, the second from the dorsal fin to the anal fin, the third is adjacent to the dorsal fin. The first rays of the dorsal fin is elongated and looks like a black and white feather.

Each upper tooth has an angled, knife-like main cusp with smaller cusplets on the trailing side, while each lower tooth has a single upright cusp. Five pairs of gill slits are seen. The first dorsal fin is rather large and positioned closer to the pectoral than the pelvic fins, though its origin lies posterior to the pectoral fin rear tips. The second dorsal fin roughly equals the first in size and is positioned slightly ahead of the anal fin, which is much smaller than either dorsal fin.

There are three pairs of fangs at the front of the jaws. The dorsal fin is very long, containing a few weak spines at the front followed by 116-123 soft rays. The origin of the anal fin lies beneath the 42nd to 44th dorsal fin ray; the anal fin contains 74-87 elements but only 14-17 have external rays, led by 2 small spines. The pelvic fins are reduced to only 1 scale-like spine and 1 soft ray, placed beneath the 8th or 9th dorsal fin ray.

The zebra turkeyfish is a scorpaenid fish with vertical stripes in orange, white and black on the body, and large, banded fan-like pectoral fins that flare out on either side as the fish lies on the seabed. The front dorsal fin is made up of thirteen tall, quill-like spines and the second dorsal fin has ten to eleven soft rays. The anal fin has three spines and about ten soft rays. The second dorsal fin, the anal fin and the rounded caudal fin are transversely banded in black and white.

As with most of the family Sillaginidae, the large-scale whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales, except for the two rows of cheek scales which are mostly cycloid. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 19 to 21 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 19 to 21 soft rays posterior to the spines.

The lateral-line shows an abrupt downwards curve below the rearmost spines in the dorsal fin. The dorsal fin is continuous, with an elongated base and it is uniform in height along its length. The anal fin is similar to the posterior portion of the dorsal fin and is placed opposite it. The caudal fin is truncate while the pectoral fins are short and rounded and the pelvic fins are aloe short and are positioned with their origins underneath the base of the pectoral fins and do not reach the vicinity of the anus.

As with most of the genus Sillago, the oriental trumpeter whiting has a slightly compressed, elongate body tapering toward the terminal mouth, reaching a maximum overall length of 30 cm. The body is covered in small ctenoid scales extending to the cheek and head. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 18 to 20 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 17 to 19 (usually 18) soft rays posterior to the spines.

The tail is not prehensile. The dorsal fin is situated nearer to the head than to tip of tail and has a moderately long base. The anal fin is very small and is located below the posterior half of dorsal fin, the caudal fin is small and rounded and a pectoral fin is present. The meristics are that the dorsal fin has 30-36 soft rays, the anal fin has 3-4, the pectoral fin has 9-11 and the caudal fin has 7-10, although this is normally 9-10.

As with most of the genus Sillago, the western trumpeter whiting has a slightly compressed, elongate body tapering toward the terminal mouth, reaching a maximum overall length of . The body is covered in small ctenoid scales extending to the cheek and head. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 19 to 21 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 18 to 20 soft rays posterior to the spines.

The spinous dorsal fin, including the last dorsal fin spine is blackish or dusky, the soft dorsal fin is blackish or dusky above the scaly sheath and the margin of first to fourth upper soft rays is whitish. The middle portion of the anal fin below the scaly sheath is slightly blackish or dusk. The caudal fin is often a striking yellow, especially when fresh, with the upper caudal lobe often fading to a darker shade. The posterior scutes may also be a yellow to rusty colour, especially after removal from the water.

The coloration is gray to brownish gray on the back which is lighter below, and notably darker on the "lips", around the eye, and near the dorsal fin. There is sometimes a dark blaze between the head and dorsal fin as well. One female in the Southern Hemisphere was bluish black with a white area between the dorsal fin and tail as well as a light gray jaw and throat, as well as black speckling. One individual from the Canary Islands had an area of white from snout to blowhole.

Fins rounded, dorsal fin medium length, anal fin about 10-20 percent longer than the dorsal fin. Leading edge of the anal fin usually at a position about half way along the dorsal fin base. Pelvic fins medium sized, and positioned low at about the mid point of the body with the anal fin positioned half way between the pelvic fins and the tail. Pectoral fins medium sized, rounded to paddle shaped, positioned low on the body with the upper edge even with or slightly higher than the rear end of the mouth.

The two dorsal fin have rounded apices and are placed far back, with the first originating over the pelvic fin bases. The second dorsal fin is noticeably smaller than the first. The anal fin is less than half the size of the first dorsal fin and placed so that its free rear tip just reaches the base of the caudal fin. The caudal fin is long and low and comprises about a quarter of the total length, with no lower lobe and a strong ventral notch near the tip of the upper lobe.

Juveniles who lack the white insert can be distinguished by the shorter extension of the first rays of the dorsal fin.

Claroteids have moderately elongated bodies, usually with four pairs of barbels, an adipose fin, and strong pectoral and dorsal fin spines.

The dorsal fin free rear tips and the caudal fin posterior margin are white. The largest known specimen measures in length.

The dorsal fin has a black spot at the base of the spines and the caudal fin, which is rounded or has a short extension from the upper lobe, has a larger black spot. There are several rows of small black spots on the soft rays of the dorsal fin and one row on the anal fin.

The longsnout boarfish grows to a maximum length of . It has a large, spiky dorsal fin with 10-11 spines and a slightly forked tail. Its snout is almost tubular with a small mouth. The fish is white in colour with two dark angled bands on both sides and another band running from the snout tip to dorsal fin.

The pectoral fins of adults are broad and falcate (sickle-shaped). The dorsal fins have nearly vertical trailing margins, with the first originating over the pectoral fin rear tips. The second dorsal fin is about three-quarters as high as the first. The anal fin is much smaller than the second dorsal fin and originates well behind it.

The spot-tail shark is a spindle-shaped fish growing to about . It has a fairly long, pointed snout and moderately large eyes. The first dorsal fin is large and curved, while the second dorsal fin is small and low. The back and sides are grey and the belly white, and a long white streak is on the flank.

The long and narrow pectoral fins are falcate (sickle-shaped) with pointed tips. The large first dorsal fin is also falcate and originates over or slightly behind the rear of the pectoral fin bases. The second dorsal fin is moderately tall and positioned about opposite the anal fin. There is no midline ridge between the dorsal fins.

Florida Museum of Natural History Ichthyology Department. Retrieved on September 10, 2009. The broad, triangular pectoral fins originate below the third or fourth gill slits, and are no longer than the front margin of the first dorsal fin. The anal fin is about twice as long as the second dorsal fin and preceded by long ridges.

Other members of the A5 Pod included A14 (Saddle). She was easily recognized by her unique saddle patch - a marking behind the dorsal fin. A14's daughter, A25 (Sharky) was also known for having a pointed dorsal fin. Saddle died in 1991, around the age of 44, while Sharky died unexpectedly at the age of around 26, in 1997.

The remaining portion of the dorsal fin is made up of seven branching rays. The spine of the pectoral fin about as long as the dorsal fin spine, and serrated on both sides. The adipose fin is 3 to times as long as it is deep. The anal fin contains five unbranched and seven to eight branched rays.

The snout is long and slender, and the dark eye of the fish is less conspicuous than the dark eye-spot on the dorsal fin. The base of the tail features a dark band that runs perpendicular to the tail. Butterflyfish may be distinguished from the similar C. marginalis by their color pattern and number of dorsal fin rays.

The mouth is small and terminal and it has strong teeth. The first dorsal fin has three spines, one of which is longer and stronger than the other. It is erectile and kept in a dorsal furrow at rest. The second dorsal fin is similar in shape and size to the anal fin, which is symmetrically opposed to it.

Mouth is protractible, upwardly directed, with small teeth. Lower jaw has an upper expansion within mouth (high dentary bone). There are two separate dorsal fins, with all rays of first and 1-2 anterior rays of second dorsal fin being unsegmented. The anal fin is similar to the second dorsal fin, while the caudal fin is forked.

Rio Grande cutthroat trout have irregular shaped spots that are concentrated behind the dorsal fin, smaller less numerous spots located primarily above the lateral line anterior to the dorsal fin, and basibranchial teeth that are minute or absent. Rio Grande cutthroat trout are light rose to red-orange on the sides and pink or yellow-orange on the belly.

This fish reaches about 25 centimeters in maximum length. The first dorsal fin is very tall. The body is gray in color with three brown or black bands. The first two bands are small and vertical, and the third extends from the tip of the tall dorsal fin down the body to the tip of the tail fin.

The body is very soft, almost gelatinous. Unlike in other catsharks, the first dorsal fin originates well in front of the pelvic fins. The second dorsal fin is about as long and slightly lower than the first, and is positioned opposite the anal fin. The dorsal, pelvic, and anal fins have convex leading and nearly straight trailing margins.

There is a large bluish-black eyespot surrounded by a white ring on the 6th and 7th rays of the dorsal fin.

The dorsal fin has 6 spines and 9 soft rays while the anal fin has 3 spines and 31-43 soft rays.

For customers wanting a return to pre-war glamour, the 'dorsal fin' was available as an option even on the next generation.

However, in Hemipsilichthys, the dorsal fin membrane and most anterior plate of the adipose fin do not touch, while they do in Delturus.

When the batfish reaches maturity, its dorsal fin becomes a single spine-like projection (thought to function primarily as a lure for prey).

The Slender whiting has the same basic body profile as all the smelt whiting species, with an elongate, slightly compressed body covered in ctenoid scales, tapering toward the terminal mouth. Being one of three species known from the Persian Gulf, further anatomical features must be examined before the species can be confidently identified. The first dorsal fin consists of 12 or 13 spines, with the second dorsal fin having a single spine and 19 to 21 soft rays. The anal fin is similar to the second dorsal fin, but having 2 spines and between 18 and 20 soft rays.

Polynemus aquilonaris is a medium- sized species of threadfin which attains a maximum total length of . It has a pointed snout and a dorsal profile which is nearly straight. There are two separate dorsal fins, the first dorsal fin with 8 spines in which the bases of the spines have a similar thickness and the second dorsal fin has a single spine and 15 to 19 soft rays. The anal fin has 3 spines and 11 to 13 soft rays and it has a base that is shorter then the base of the second dorsal-fin base.

In its usual range the dolphin is easily identifiable. The southern right whale dolphin is the only cetacean of comparable size and comparable coloration with overlapping distributions that lives as far south. The absence of a dorsal fin in right whale dolphins, in contrast to the generally tall and curved dorsal fin of hourglass dolphins makes confusion of the two species very unlikely. The dorsal fin in hourglass dolphins is variable and the curvature may be particularly pronounced in older animals. An adult male is about 1.8 meters (5.9 ft) in length and weighs over 90 kilograms (about 200 lbs).

The dorsal fin has 10 spines and 15-16 soft rays amd the anal fin has 3 spines and 7 soft rays. The upper third of the body is yellowish in colour in males while the rest of the body is pinkish and there is a magenta stripe which runs between their eyes and from the upper margin of the eyes to the origin of the dorsal fin. The dorsal fin and lobes of the caudal fin are magenta. The females are overall yellow, sometimes a darker yellowish-orange, with a similar magenta stripe between the eyes as the male.

C. eques and C. goeldii display some geographic variations in certain morphometric characteristics. C. abuelo has a dusky-gray body colouration that varies from relatively plain to having numerous small brown spots, and usually has a broad, diffuse band crossing the nape at the dorsal fin origin. Both C. goeldii and C. eques have a relatively uniform body colouration without spots; C. goeldii has a small, triangular spot at the dorsal fin origin, while C. eques has a distinct dark band at the dorsal fin origin. C. abuelo appears to attain the largest size of the three species, reaching at least .

The yellowtail barracuda has an elongated body with two well separated dorsal fins, the anterior dorsal fin has five spines with the first spine being the longest. The origin of the second dorsal fin is positioned slightly in front of that of the anal fin. The pelvic fin is located below the tip of the pectoral fin, which in turn is positioned in front of the origin of the anterior dorsal fin. The large head is slightly flattened towards the rear and bears a large eye, pointed snout and long jaws, with a prognathic lower jaw.

Lophiid anglerfishes also have two or three other dorsal fin spines located more posteriorly on the head, and a separate spinous dorsal fin with one to three spines located more posteriorly on the body just in front of the soft dorsal fin. In the more primitive anglerfish genera (Sladenia and Lophiodes), the gill opening extends partially in front of the elongated pectoral fin base. In the derived lophiid genera (Lophiomus and Lophius), and all other anglerfishes, the gill opening does not extend in front of the pectoral fin base. The largest individuals may exceed in length.

The first dorsal fin is relatively small, with 4-8 spines, while the second dorsal fin is larger, with 10-17 rays. The pectoral fins are broad and rounded, with from 15 to 23 rays. They can reach lengths of 21 cm. These mudsuckers occur in estuaries, primarily in tidal sloughs with shallow mud-covered bottoms, where they often excavate burrows.

There are five pairs of fairly short gill slits. The pectoral fins are fairly short and pointed, with a falcate (sickle-like) shape. The first dorsal fin is medium-sized and triangular, and originates roughly over the pectoral fin free rear tips. The second dorsal fin is small and low, and originates over the middle of the anal fin base.

The central spine on the gill cover is and reaches past the rear of the opercular membrane. The dorsal fin contains 8 spines and 13 soft rays while the anal fin has 3 spines and 7 soft rays. The membranes between the dorsal fin spines are deeplyncised and the spines have fleshy, scale covered bases. The caudal fin is truncate.

It has two dorsal fins that help differentiate this shark from other Oxynotus species. Its first dorsal fin is inclined forward, is very long and thick, and triangular in shape. The second dorsal fin is similar to the first, although it is not as long. However, as some other Oxynotus species, the Caribbean roughshark does not have an anal fin.

The fairly long and pointed pectoral fins are slightly sickle-shaped (falcate) and originate between the fourth and fifth gill slits. The first dorsal fin is medium-sized and triangular with a pointed apex, and originates over the rear of the pectoral fin bases. The second dorsal fin is small and positioned opposite the anal fin. No ridge exists between the dorsal fins.

The small pectoral fins are falcate (sickle-shaped) with relatively pointed tips. The first dorsal fin is broad, forming nearly an equilateral triangle in adults, with a blunt apex; it originates over the pectoral fin rear tips. The second dorsal fin is small and originates over the midpoint of the anal fin base. No ridge exists between the dorsal fins.

The fish is stout and deep-bodied, with a pointed snout and long continuous dorsal fin. It is brown with tan wavy bands stretching the length of its body. On the dorsal fin near the head is a small blue spot. This species grows to TL. The fish has relatively large fangs (canine teeth) that protrude from the lower jaw.

Its dorsal fin lacks the prominent black spot. This species has a dorsal fin that lacks the prominent black spot. The dorsal surface of the fish is typically an olive or straw color that has a silver overlay, and there is a dusky strip along its back. The ventral surface is a silvery white, and has a silver-black strip along its side.

It has large, reflective, silver cycloid scales that are responsible for giving the quillback its characteristic silver color. They have a white belly with yellow or orange lower fins. The tail and dorsal fin are usually gray or silver. The quillback gets its name from the long quill that is formed via the first several fin rays of the dorsal fin.

The pelvic fins are rather long and narrow; males have slender claspers that have a fleshy flap at the tip. The first dorsal fin base is located roughly over the latter half of the pelvic fin bases. The second dorsal fin is smaller and more angled than the first. The dorsal fins have more rounded apexes in females than males.

In 1977, Dr. Dick Beamish and Doris Chilton of the Pacific Biological Station published an article showing that cross sections of the fourth to eighth fin rays from the second dorsal fin provided a method for estimating the age of lingcod.Beamish, R.J. and D. Chilton. 1977. Age determination of lingcod (Ophiodon elongatus) using dorsal fin rays and scales. J. Fish. Res.

The remaining portion of the dorsal fin is made up of seven dark branching rays. The spine of the pectoral fin is slightly curved, roughly as long as the dorsal fin spine, with large serrations on the back side. The pectoral spine ends in short, white filament. The rest of the pectoral fins are made up of eight to nine branching rays.

Decodon puellaris has an elongated, laterally compressed body with a thick-lipped, protrusible mouth. The adults have 4 front teeth in upper jaw and 2 in lower which are protruding. The dorsal fin has a smooth profile without any noticeable notch, there are ten dorsal fin spines and 9-10 soft rays. The anal fin has 3 spines and 10 rays.

The short and thick tail bears skin folds along either side and two dorsal fins on top. The first dorsal fin is slightly larger than the second. The well-developed caudal fin is triangular with blunt corners, and is approximately as long as the space between it and first dorsal fin. The skin is smooth and soft, entirely lacking dermal denticles.

The lesser amberjack has an olive green or brownish back with silver flanks. There is a dark stripe which runs from behind the eye to front of the first dorsal fin. Compared to the related greater amberjack, the lesser amberjack has a proportionately larger eye and a deeper body. The anal fin is around two-thirds the length of the second dorsal fin.

The largest specimen used to describe C. gunting is about 7.7 cm. The mature individual specimen is brown in the upper body, gradually turning pink in the middle body and silvery gray in the lower body. Black fringe along the dorsal-fin spine, and both on the caudal fin (in two lobes) and its caudal peduncle. Soft dorsal fin with black rays.

The pectoral fins are broad and moderate in size, with narrowly rounded tips. The first dorsal fin is roughly triangular and originates over the middle of the pelvic fin bases. The second dorsal fin is much smaller than the first, low, and long-based, originating behind the anal fin origin. The pelvic fins are small, with elongate claspers in males.

Gars and bowfins are found in North America and in freshwater ecosystems. The differences in each can be spotted very easily from just looking at the fishes. The gars have elongated jaws with fanlike teeth, only 3 branchiostegal rays, and a small dorsal fin. Meanwhile the bowfins have a terminal mouth, 10-13 flattened branchiostegal rays, and a long dorsal fin.

The fins are strongly falcate (sickle-shaped), particularly the dorsal fins, pelvic fins, and lower caudal fin lobe. The pectoral fins are narrow and pointed. The first dorsal fin is positioned about halfway between the pectoral and pelvic fins. The second dorsal fin is about two-thirds as tall as the first and is positioned slightly ahead of the anal fin.

The central cusp in all teeth is two to three times as long and broad as the other cusps. The animal possesses 9 dorsal fin rays. Its first unbranched ray is half of the length of its second ray. The distal margin of the dorsal fin is nearly straight, its origin being at the middle of the fish's standard length.

Amiiform locomotion consists of undulations of a long dorsal fin while the body axis is held straight and stable, as seen in the bowfin.

It differs from the blackside darter (P. maculata) in usually having 11 rays on the first spiny dorsal fin instead of 13 to 14.

The genus name Semotilus derives from the Greek word sema (also known as dorsal fin), and atromaculatus comes from the Latin word "black spots".

The head is cone shaped with a blunt beak. The dorsal fin is triangular in shape and centred in the middle of the back.

C. parasema is a small marine fish that reaches 2.8-3 inches in length. It has a spiny dorsal fin and is laterally compressed.

The grayling, inhabit mountain lakes and still rivers. The grayling has a long dorsal fin that is multicolored, typically consisting of reds and aquas.

Proceedings of the National Academy of Sciences, USA 95:9384–9389. White shark tagged below the dorsal fin with a pop-up satellite tag.

The margins of the mouth and gills are blackish and the fins are dark. The first dorsal fin has blackish margins and has two spines.

Pharyngeal jaws comprising patch of 16–18 small conical teeth. 10–12 gill rakers present. Nine rays in dorsal fin. Seven rays in anal fin.

It has a fairly distinctive black pattern on its head and a uniformly dark first dorsal fin (although this latter is not a unique trait).

Identified by other Puntius species by last unbranched dorsal-fin ray becomes smooth. rostral barbels absent, but maxillary barbels present. 20-23 lateral-line scales.

They are named for the sail-like shape of their first dorsal fin in the males, which are also brightly coloured, compared with the females.

This species can reach a length of TL. Male dwarf gouramis in the wild have diagonal stripes of alternating blue and red colors; females are a silvery color. Besides the difference in color, the sex can be determined by the dorsal fin. The male's dorsal fin is pointed, while the female's is rounded or curved. They carry touch-sensitive cells on their thread-like pelvic fins.

Body axis straight (Sublette et al. 1990). Mouth position: Supraterminal, oblique; mouth small; obliquely sloped, protruding lower jaw (Sublette et al. 1990). External morphology: Distance from origin of dorsal fin to end of hypural plate more than distance from origin of dorsal fin to preopercle (Hubbs et al. 1991); dorsal and caudal fins rounded; pectorals, pelvic, anal fins rounded at apex (Sublette et al. 1990).

The lobes start near the midline of the seahorse's trunk and continue to the end of the seahorse's tail. The first lobe does resemble a small dorsal fin, but it is not one. Unlike all of the other members of its genus, this species of seahorse lacks a dorsal fin. The holotype is yellow-cream in color, and it is covered with small brown spots.

Chaetodon auriga is up to long. Its body is white with `chevron' markings on the side. Tear edge of the dorsal fin has a prominent black spot, and a prominent black vertical band runs through the eye. The rear of soft-dorsal fin has a trailing filament, and it has a belly patch of descending oblique dark lines as well as bright yellow fins.

The lower teeth are smooth, knife-like, and angled, with their bases interlocking to form a continuous cutting surface. The five pairs of gill slits are long. The first dorsal fin bears a stout spine in front and originates over the free rear tips of the rounded pectoral fins. The second dorsal fin is much larger than the first and has a longer spine.

For example, the white marlin has a dorsal fin with a curved front edge and is covered with black spots. The huge dorsal fin, or sail of the sailfish is kept retracted most of the time. Sailfish raise them if they want to herd a school of small fish, and also after periods of high activity, presumably to cool down.Aquatic Life of the World pp.

The pectoral fins are small, broad, and rounded; the pelvic fins are similar and almost as large. The two dorsal fins have straight trailing margins and are spaced well apart. The first dorsal fin is as large or larger than the pelvic fins, originating behind the middle of the pelvic fin bases. The second dorsal fin is slightly smaller than the first but has a longer base.

The first dorsal fin originates over the free rear tips of the pectoral fins; it is large and falcate (sickle-shaped) with a pointed apex. The second dorsal fin is positioned opposite the anal fin and is relatively large and high. There is no ridge between the dorsal fins. A crescent-shaped notch is present on the caudal peduncle just before the upper caudal fin origin.

The brindled madtom is laterally compressed along the caudal peduncle and has a dorsally compressed anterior from the pelvic fins to the jaw. The brindled madtom is light brown, with dark dorsal splotches along the tip and two conspicuous saddle marks just behind the dorsal fin. The dorsal fin has a dark, spotted blotch on the tip and is located between the pectoral and pelvic fins.

The fourbeard rockling is a long, slender fish named for its four barbels, one of which is on the chin and the others on the snout. The vent is halfway along the body and behind that, the body is laterally compressed. The anterior dorsal fin has one prominent long ray and is otherwise short and low. The posterior dorsal fin is very long and of even height.

"Fancy Goldfish: A Complete Guide to Care and Collecting", Weatherhill, Shambhala Publications, Inc., 2006. - A ranchu has an egg-shaped body with a deep belly that is between 5/8 to 3/4 the length of the fish. This goldfish does not have a dorsal fin and breeding standards require that the back should not have any vestiges of the dorsal fin on it.

A. punctatus has a body with variably sized dark spots scattered over the body and the fins, while A. longimanus does not. Species of Auchenipterichthys are sexually dimorphic. Breeding males of A. coracoideus have an elongated dorsal fin spine. In A. longimanus and A. thoracatus, serrae on the end of the dorsal fin spine are proportionally longer in breeding males than in juveniles and females.

The caudal fin is forked with short, although distinct, peduncle flanges. The anal fin is longer than the dorsal fin and begins well posterior to the dorsal fin base. Pectoral fins are long and slender. The fish has a large, clearly visible swim bladder located below the spine just forward of the longitudinal mid-point, and an adipose fin on the dorsal surface above the anal fin.

These small scales give the Atlantic mackerel a velvet-like feel. The two dorsal fins are large and spaced far apart. The second dorsal fin is typically followed by 5 dorsal finlets, though it can have 4 or 6. The anal fin, which originates slightly behind the second dorsal fin, is similar to it in size and shape and is also succeeded by 5 finlets.

Parancistrus is unique among loricariids due to the presence of fleshy folds on the naked area around the dorsal fin and at the pectoral fin points insertion in the breeding males. Breeding males also have elongated odontodes on their bodies and pectoral fin spines. Parancistrus have stout bodies that are completely plated in adults. The dorsal fin membrane connects to the adipose fin spine.

This means they are efficient feeders that can capture and process a wide variety of food items. Their mouths are protrusible, usually bordered with wide and often swollen lips. The jaws have conical teeth. Typically, tilapia have a long dorsal fin, and a lateral line which often breaks towards the end of the dorsal fin, and starts again two or three rows of scales below.

The Indian threadfin is a large species with an elongated head and body. Its eye is roughly the same size as the length of its snout. The joint of the jaws is to the rear of the eyelid. It has two separated dorsal fins, the first dorsal fin contains 8 spines while the second dorsal fin has a single spine and 12 or 13 soft rays.

They also have a black blotch at base of rearmost spines in the dorsal fin and 2 small black spots at base of soft-rayed part of the dorsal fin with a third spot on the upper part of the caudal peduncle. Between each of these black blotches there are 4 or 5 white spots. The maximum recorded total length is and the maximum recorded weight is .

Epinephelus albomarginatus has a body with a standard length which is 2.6 to 3.0 times as long as its depth. The preopercle has an angle and has 2-3 enlarged serrations at its angle. The dorsal fin has 11 spines and 14 soft rays while the anal fin contains 3 spines and 8 so rays. The membranes between the dorsal fin spines are obviously incised.

The teeth are closely arranged with a quincunx pattern; each is small with a transverse ridge on the crown. The five pairs of gill slits are short. The pelvic fins are almost square, with rounded corners. The tail is shorter than the disc and bears a prominent dorsal fin about halfway along its length; immediately posterior to the dorsal fin is a serrated stinging spine.

The dorsal fin is continuous, the spiny part contains 11-13 spines and is arched with the fifth spine being the longest, the spines behind that decreasing in size. There are 8-9 soft rays in the dorsal fin and the longest of these are shorter than longest dorsal spines. The anal fin has 3 spines and 8-9 rays. The caudal fin is emarginate.

The yellowback puller grows to a maximum length of about . The single dorsal fin has thirteen spines and eleven to thirteen soft rays and the anal fin has two spines and ten or eleven soft rays. This fish has a dark diagonal line running from the eye to the posterior end of the dorsal fin. Above this line it is yellowish-brown and below it is silvery.

The caudal fin is forked and homocercal (upper and lower lobes of equal length). The dorsal fin contains at least 8 fin rays. The anal fin is larger than the dorsal fin and also bears at least 8 rays. The scales vary greatly in size and shape, with a series of large plate-like scutes along the dorsal and ventral midline behind the dorsal and anal fin.

The dorsal fin has fewer or equal (rarely one more) rays than the anal fin; the dorsal fin is low, with the anterior rays the longest, the pectoral fins are strikingly long, reaching to or almost to caudal fin base; pelvic fins are long, reaching beyond the anal fin origin, and their insertion is closer to the anal fin origin than to the pectoral fin insertion.

The cow was spindle- shaped, with a triangular dorsal fin with a concave trailing edge set about two-thirds the way back. It was dark gray or black dorsally and white ventrally, with a light thoracic patch created by a diagonal band that extends from behind the eye downwards and back to the dorsal fin. It also has a dark eye patch, rostrum, and flippers.

The genus can be distinguished from the rest of the Serranidae by a few morphological details, such as its lack of anal fin spines. It also has only two to four dorsal fin spines; other serranids have more. The mouth is large and the lower jaw protrudes. The coloration varies, but usually a brown stripe runs from the mouth to the front of the dorsal fin.

Banded rudderfish are bluish, greenish or brown in colour when adult and do not have any dark vertical bars. The second dorsal fin is around twice the length of the anal fin. The dark lobes of the caudal fin have white tips. The juveniles have six transverse dark bars along their flanks and a dark stripe which runs from the eye to the first dorsal fin.

Bubble eye goldfish(with a dorsal fin) seen from the top The Bubble Eye normally has an evenly curved back that lacks a dorsal fin. The pair of large pouches of skin attached under its eyes jiggle as it swims. Bubble Eyes have metallic scales, and they are similar to the celestial eye goldfish."An Interpret Guide to Fancy Goldfish" by Dr. Chris Andrews, Interpret Publishing, 2002.

Rome: United Nations Development Program: Food and Agriculture Organization of the United Nations. Though all white marlin have the same coloring pattern, they are sexually dimorphic, with the females usually larger. One of the most noticeable features of white marlin is the dorsal fin, which extends along the majority of the dorsal portion of its body. The dorsal fin consists of typically 28 to 46 rays.

The banded gunnel reaches about 12 inches (30 cm) long and has an elongated body, somewhat like an eel. Its dorsal fin has small spikes and its skin is covered in tiny scales. Its color ranges from a bright reddish orange to greenish yellow. It has thin, dark red bands reaching across its belly, and white blotches with black spots on its back and dorsal fin.

The fourth and fifth gill slits lie over the pectoral fin bases and are shorter than the first three. The pectoral fins are large and broad, with rounded margins. The first dorsal fin is fairly angular and originates over the middle of the pelvic fin bases. The second dorsal fin is much smaller and lower than the first, originating behind the anal fin origin.

Dorypterus is a small, extinct genus of prehistoric ray-finned bony fish. It lived during the Wuchiapingian stage of the upper Permian epoch in what is now Germany (Kupferschiefer) and England (Marl Slate). It is a hypsisomatic actinopterygian with a high dorsal fin. Two species have been described, D. hoffmanni and D. althausi, which are distinguished by differences in length of the dorsal fin.

However, the spot on the anterior dorsal fin is more conspicuous than that on the posterior dorsal fin. The juvenile fish tend to be lighter in colour than adults and are often marked with pale purplish iridescent lines. A common ling measuring in length was caught off Shetland on 24 February 2013. This is the largest ling ever caught on rod and line in British waters.

The opercle is also dark yellow to golden. The spinous dorsal fin is hyaline with the tips of the membranes dusky and blotched with fine dusted black spots. The second dorsal fin is hyaline to pale white with 5 to 7 rows of blackish spots, giving a vague appearance of lateral bands. The anal fin is also hyaline to milky white with white or yellow tips.

It has a large, blue-rimmed, black eyespot where the dorsal fin spines meet the dorsal fin soft rays, and a smaller, similarly coloured eyespot on the caudal peduncle. Some juveniles off the coast of southeastern Brazil have a vivid yellow and orange band on the back and dorsal fin.Unusual coloration pattern in juveniles of Stegastes fuscus (Actinopterygii: Pomacentridae) Zootaxa. Retrieved 2011-12-29.

The California grunion is a long, slender fish with a deeply forked tail. The dorsal fin is in two parts and has five to seven spines and nine to ten soft rays. The origin of the anal fin is immediately below the first dorsal fin, and this fin has twenty-one to twenty-four soft rays. The fish grows to a maximum length of .

During the night and when stimulated, they often darken their body to a reddish colour. The first dorsal fin has 9 spines while the second dorsal fin has 8 rays, the anal fin has 1-2 spinesd and 8 rays. This species may be difficult to distinguish from the blue-striped goatfish (Upeneus lineatus) but this species has a marginally longer head a dark flank stripe.

The first dorsal fin is about a third larger than the second and originates over the pelvic fin origins. The second dorsal fin is located midway between the first dorsal and the caudal fin. The broad and triangular pectoral fins have a deep indentation where their leading margins meet the head. The pelvic fins are much smaller than the pectoral fins, and the anal fin is absent.

The royal threadfin is a medium-sized threadfin species reaching a maximum total length of , although a more normal length is . It has two separate dorsal fins, the first dorsal fin has 8 spines and the second dorsal fin has a single spine and 14 or 15 soft rays. The anal fin contains 3 spines and 24 to 30 soft rays, with a base which is longer than that of the second dorsal-fin. The pectoral fin has 14 to 16 unbranched rays and is 30% to 42% of the fish's standard length with its tip extending to or just short of the centre of the base of the anal fin.

Polynemus multifilis is a medium-sized species of threadfin which attains a maximum standard length of . It has a pointed snout and the dorsal pofile of the head is almost straight, There are two separate dorsal fins, the first dorsal fin contains 8 spines which are all of a similar thickness at their bases and the second dorsal fin has a single spine and 14-16 soft rats. The anal fin contains 3 spines and 11 to 13 soft rays and its base is shorter than that of the second dorsal fin. The pectoral fin has 14-16 unbranched soft rays and its tip reaches the origin of the anal fin.

The first dorsal consists of six spines, the second of a single spine and 25 to 30 soft rays, with the last two as a separate finlet. About 4% of rainbow runners have only five spines in the first dorsal fin, and are apparently born without them. The anal fin consists of one spine detached from the fin anteriorally, while the main fin has a single spine and 18 to 22 soft rays, with the last two detached to form a finlet like the dorsal fin. The dorsal and anal fins are quite low, and the dorsal fin is much longer than the anal.

Three sand whitingThe sand whiting has a very similar profile to other members of the genus Sillago, with a slightly compressed, elongate body tapering toward the terminal mouth. The dorsal fin is in two parts, the first made of feeble spines and the second of soft rays headed by a single feeble spine, while the ventral profile is straight. The species is known to grow to a maximum size of 51 cm and around 1.25 kg weight. The fin anatomy is highly useful for identification purposes, with the species having 11 spines in the first dorsal fin, with one spine and 16 or 18 soft rays on the second dorsal fin.

As with most of the genus Sillago, the eastern school whiting has a slightly compressed, elongate body tapering toward the terminal mouth, with the body covered in small ctenoid scales extending to the cheek and head. The most reliable features for distinguishing the species are the number of fins spines and rays and the shape of the swim bladder. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 16 to 18 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 18 to 20 soft rays posterior to the spines.

The Atlantic threadfin is a medium-sized species of threadfin which grows to a maximum total length of , although most fish have a total length of around . It has a pointed snout and an almost straight dorsal profile on its head. There are two separate dorsal fins, the first dorsal fin contains 8 spines in which the bases of each spine is a similar thickness to the others, and the second dorsal fin has a single spine and 11 to 13 soft rays. The anal fin has 3 spines and 12 to 14 soft rays, The base of the anal fin is longer than that of the second dorsal fin.

The small-scale whiting is very similar in external appearance to many other members of the genus Sillago, which have a slightly compressed, elongate body tapering toward the terminal mouth. The dorsal fin is in two parts, the first made of feeble spines and the second of soft rays headed by a single feeble spine. The first dorsal fin has either 12 or 13 dorsal spines, a feature unique among Sillago which otherwise have 11 dorsal spines. The second dorsal fin has a single spine followed by 20 to 22 soft rays, while the anal fin has 2 spines and 22 or 24 soft rays.

The specific name comes from hyper, "over" and dorsalis, "of the back" from Greek in reference to its elevated "hump" in front of the dorsal fin.

Males of breeding size with have a dark spot at the front of the dorsal fin. Unlike similar darters, it does not have an opercular spine.

The male is strikingly coloured with vivid blue and red patterning on the cheek and operculum and maroon, orange and blue colouring on the dorsal fin.

There are 6–8 supraocular spines, 11 spines in the first dorsal fin. Body cylindrical and posteriorly moderately compressed. Scales ctenoid. Mouth large and slightly oblique.

The dorsal fin is set far back on the body, just above the anal fin, and is somewhat smaller than the anal fin, with 11 rays.

It is an aggressive predator. The dorsal fin has 10 to 12 spines and 10 to 15 soft rays, which are used for offence and defence.

It possesses a high caudal peduncle. It shows a large fin size, with a pectoral fin that is larger than the height of its dorsal fin.

It possesses a low caudal peduncle. It shows a large fin size, with a pectoral fin that is larger than the height of its dorsal fin.

The dorsal fin, which lacks a spine, is adnate with the body. The anal fin is not adnate with the body. The adipose fin is absent.

The dorsal fin and the anal fin each have 8 soft rays and the lateral line has 66-84 scales. They can grow to in total length.

Breeding female Coastrange sculpins are generally larger than males. Breeding males are almost entirely black with a tiny bit of orange trim on the first dorsal fin.

Both a dorsal and lateral stripe are present. A large dark spot is present on the dorsal fin and the anal fin is yellow with blue stripes.

The males change in colour to being all black with a contrasting white mouth and a pale blue margin to the dorsal fin when in breeding condition.

The dorsal fin is very small and hooked; its size is considerably smaller than that of the dwarf sperm whale and may be used for diagnostic purposes.

Maximum size 277 mm. Two pairs of barbels (maxillary and rostral) present. Dorsal fin has 12–13 branched rays. There are 44–51 scales on lateral line.

This fish reaches 6 cm in length. It has a yellow head, yellow ventral fins, and a large black spot at the back of its dorsal fin.

In breeding coloration the male fish has an occelated spot at the rear of the first dorsal fin. Molecular analyses have placed the Kraemeriidae within the Gobiidae.

"Pteronotropis" means "winged keeled back", which refers to the breeding males' enlarged dorsal fin. "Signipinnis" means "banner fin", referring to the striking color of the median fins.

The head and body are greyish silver on the back and silver below. The front margin of the first dorsal fin and the rear margin of the second dorsal fin are blackish, they are otherwise translucent. The pectoral fins are also translucent. The bases of the pectoral filaments are white, becoming blackish on their tips, The pelvic fin is translucent with its base and its rear edge being white.

The first dorsal fin has an orange stripe at its base and a wider and darker reddish brown stripe at its tip. The second dorsal fin has a number of reddish stripes. The lobes of the tail are marked with indistinct crossbars. There are a total of 9 spines in the dorsal fins and 8 soft rays while the anal fin has 2 spines and 6 soft rays.

The Indo-Pacific sailfish has a prominent dorsal fin. Like scombroids and other billfish, they streamline themselves by retracting their dorsal fins into a groove in their body when they swim. The huge dorsal fin, or sail, of the sailfish is kept retracted most of the time. Sailfish raise them if they want to herd a school of small fish, and also after periods of high activity, presumably to cool down.

In the skull, adult males have longer lower jaws than females, as well as larger occipital crests. An individual killer whale can often be identified from its dorsal fin and saddle patch. Variations such as nicks, scratches, and tears on the dorsal fin and the pattern of white or grey in the saddle patch are unique. Published directories contain identifying photographs and names for hundreds of North Pacific animals.

The lateral line has an irregular zigzag pattern. The head is flattened anteriorly with a terminal mouth. There are three pairs of thread- like barbels, one pair maxillary and two pairs mandibular. The dorsal fin and pectoral fins have large spines; the dorsal fin spine has a lower degree of serration than the pectoral fin spines, which is always serrated strongly on the entire length of both margins.

The dorsal fin normally contains 9 spines, although some species have 10, as well as 12 to 19 rays. The origin of the dorsal fin sits above the opercle and the soft rayed part is shorter than the spiny part. The anal fin contains 3 distinct spines and 7 to 10 soft rays. The pectoral fin is rounded with its middle rays being longer than the others longest.

The females also have a violet stripe from below the eye to the lower part of the base of the pectoral fin and have red tips to the lobes of the caudal fin. The juveniles show lavender tips to the spines in the dorsal fin. The dorsal fin contains 10 spines and 16 soft rays while the anal fin has 3 spines and 7 soft rays. The maximum total length is .

The first dorsal fin is tall and positioned slightly closer to the pectoral fins than the pelvic fins. The pelvic fins are almost as large as the first dorsal fin and bear long, thin claspers in males. The second dorsal and anal fins are tiny, with the former positioned ahead of the latter. Crescent-shaped notches occur on the caudal peduncle at the upper and lower origins of the caudal fin.

Pterygoplichthys multiradiatus is one of several tropical fish commonly known as Orinoco sailfin catfish,plecostomus (or plecos). It belongs to the armored catfish family (Loricariidae). Named for its sail-like dorsal fin, the part of its scientific name multiradiatus means "many-rayed" and refers to the rays of the dorsal fin. P. multiradiatus is one of a number of species commonly referred to as the common pleco by aquarists.

The banded archerfish may also be confused with the smallscale archerfish, Toxotes microlepis. These are more difficult to distinguish, but the most striking difference is in the last two bands. While both species have four or five wedge-shaped bands, those of the banded archerfish extend to the dorsal fin, whereas those of the smallscale archerfish do not; there are two spots on the dorsal fin separate from the main bar.

Species of Cheirocerus have a fully ventral mouth with relatively fleshy lips, a broad premaxilla, a crimped gas bladder that appears to have fringe or finger-like projections, and the slender hollow tube extensions on each side of the gas bladder. These fish have an undeveloped dorsal fin locking mechanism and no dorsal fin spine. They also have a relatively long adipose fin. These species all have three pairs of barbels.

The mandibular barbels have short and broad branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. marmoratus, the spine of the dorsal fin is short, about half the length of the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

Pompoms may have either metallic or nacreous scalation, and can occur with or without a dorsal fin. It will be best if the lionhead variety of these fishes are engaged with the same variety or other dorsal fin less fishes. Free Information Keeping Pom Pom Goldfish The Chinese submit this variety as the "Velvet ball". There are records for the existence of this fish being seen as far back as 1898.

The dorsal fin of A. ferox has about three rays strongly exerted, beginning with the third or fourth ray. It is known to have a large mouth with two fangs. It is generally pale, iridescent, and dark around the dorsal fin; all of its fins are either dark brown or black. The stomach of the A. ferox is similar to that of the other species in the suborder of Alepisauroidea.

The posterior dorsal fin is similar in size to the anal fin and is situated above it. The lateral line is prominent and extends straight from head to tail. The spinous dorsal fin is placed above the pelvic fins and is normally retracted in a groove. The caudal fin is moderately forked with its posterior edged double-curved and is set at the end of a stout peduncle.

The Japanese butterflyfish is a deep-bodied, vertically flattened fish up to long. The dorsal fin has 12 or 13 spines and 18 to 20 soft rays while the anal fin has 3 spines and 15 or 16 soft rays. The body is creamy-brown, rimmed with dark brown. The juvenile fish has an eyespot in the region of its soft dorsal fin, but this fades as it grows.

Pacific white-sided dolphin's brain at alt=Photo of dual-hemisphered brain The Pacific white-sided dolphin has three colors. The chin, throat and belly are creamy white. The beak, flippers, back, and dorsal fin are a dark gray. Light gray patches are seen on the sides and a further light gray stripe runs from above the eye to below the dorsal fin, where it thickens along the tail stock.

Females and nonbreeding males are colored similarly, although their colors are less intense than those of breeding males. The darter has from nine to twelve dorsal fin spines, seven to nine anal fins and nine to twelve dorsal fin rays. The darter has an average length of , although the maximum reported length of a specimen of P. roanoka is . The darter has a maximum life span of three years.

Adult Starksia atlantica can grow to in length. It is an elongated shape with a continuous short dorsal fin running most of the length of the body. The colour is variable, being mostly mottled brown on a silvery background with larger dark spots above. The dorsal fin has 18–19 rays, the anal fin 7–8 rays, the pelvic fins have 15–16 and the pectorals 14 rays.

Fish: 77 Great Fish of North America. The Greenwich Workshop Press, Seymour, Connecticut, pp:76-77 The spotted seatrout has prominent canine teeth. Like other fish of the family Sciaenidae, it has an elongated, soft dorsal fin with scales; it is separated from the spinous dorsal fin by a deep notch. It usually has two anal spines and the lateral line extends to the tip of the caudal fin.

Scomberoides commersonnianus has a single row of 5-6 large dark silvery spots or blotches running along the flanks over the lateral line. It does not have a dark tip on the dorsal fin lobe. The snout is rather blunt and the large mouth has several rows of very sharp teeth. The anal fin and the dorsal fin are truncated with the posterior part of each fin reduced to spines.

A long fin extends posteriorly, along half the tail fin, forming the second dorsal fin. Evidence of the first dorsal fin is incomplete, but scientists believe that a fossil element found was its fin support. Ventrally, the large anal fin extends back beneath the anterior part of the tail fin. Scales that overlap anteriorly have been found, the smallest being only 5 mm across, and the largest 22 mm.

Gymnogeophagus pseudolabiatus is a species of geophagine cichlid. It inhabits parts of the Uruguay and Río Negro rivers. It is characterised by the absence of supraneural bones, the presence of a forward spine in its first dorsal fin pterygiophore, the absence of an oblique bar between the eye and nape, possessing a black marking near the dorsal fin origin that projects to its dorsum, as well as other features.

Gymnogeophagus mekinos is a species of geophagine cichlid. It inhabits parts of the Uruguay and Río Negro rivers. It is characterised by the absence of supraneural bones, the presence of a forward spine in its first dorsal fin pterygiophore, the absence of an oblique bar between the eye and nape, possessing a black marking near the dorsal fin origin that projects to its dorsum, as well as other features.

Gymnogeophagus missioneiro is a species of geophagine cichlid. It inhabits parts of the Uruguay and Río Negro rivers. It is characterised by the absence of supraneural bones, the presence of a forward spine in its first dorsal fin pterygiophore, the absence of an oblique bar between the eye and nape, possessing a black marking near the dorsal fin origin that projects to its dorsum, as well as other features.

Gymnogeophagus lipokarenos is a species of geophagine cichlid. It inhabits parts of the Uruguay and Río Negro rivers. It is characterised by the absence of supraneural bones, the presence of a forward spine in its first dorsal fin pterygiophore, the absence of an oblique bar between the eye and nape, possessing a black marking near the dorsal fin origin that projects to its dorsum, as well as other features.

These rays make up a fin tall and rounded in the anterior, but quickly levels off and then decreases as it extends to the posterior. Behind the large primary dorsal fin is the secondary dorsal fin, which is made up of five to six rays. White marlin have a set of similar pectoral fins and pelvic fins. These two sets of fin are rounded and wide at the tip.

Skull of a male strap-toothed beaked whale Adult strap-toothed beaked whales show a distinctive colouration that perhaps makes them one of the most readily distinguishable beaked whale species. Adults have a white beak, with a pale white ‘cape’ that extends to halfway between the dorsal fin and head. The dorsal fin is set far back down the body and is white-tipped. The flukes also have white tips.

509 were built, all of which were delivered to the USAAF as Aeronca L-16As. ;Aeronca 7CCM Champion :(1948) Powered by a Continental C-90-8F (O-205-1), fitted with a larger dorsal fin and wing tanks. 125 civilian models were built. (100 built for the USAAF as the L-16B) ;Aeronca 7DC :(1948) Powered by an Continental C-85-8, fitted with a dorsal fin and larger tail-plane.

The first dorsal fin originates over the pelvic fins, while the second dorsal fin originates over the anal fin. The caudal fin is nearly horizontal, with an indistinct lower lobe and a prominent notch near the tip of the upper lobe. The skin is relatively smooth, as the dermal denticles are small and flattened. The coloration consists of a plain dark background with 7-8 darker, more or less prominent saddles.

The dorsal fin is continuous, and has its origin quite far to the rear of the head but is till longer than the anal fin. The dorsal fin contains 11 spines and 11-12 soft rays while the anal fin has 3 spines and 11 soft rays. The caudal fin is emarginate but not deeply so. The lateral line has 63-81 scales of which 50-62 have pores.

The first spinous ray of the dorsal fin is the strongest and most sharp-pointed. The spikedace has seven dorsal fin-rays and typically 9 anal fin-rays. The spikedace skin is olive-gray to light brown above, with a brilliant silver side, often with blue reflections, and with black specks and blotches on the back and upper side. The breeding male has a spectacular, bright, brassy yellow head and fins.

The black speckling on the back and flanks is consistent however. The spiny dorsal fin is moderate in height and is partially separated by a notch from the high, rounded soft dorsal fin. Soft dorsal, anal and caudal (tail) fins are all large and rounded, and are light grey to dark grey or black with distinct white edges. The large, rounded pectoral fins are usually similar in colour to flanks.

Dubuque: Wm. C. Brown Company Publishers. p. 117 The length of the body, not including the caudal fin, is four times the length of the head and five and a half times the body depth. These shiners have around 34-37 lateral scales and seven rows of scales between the base of the dorsal fin and lateral line. There is also an average of 14-18 scales before the dorsal fin.

Bigeye tuna can grow up to 250 centimetre (98 inches) or 8 feet, in length. Maximum weight of individuals probably exceeds , with the all-tackle angling record standing at . They are large, deep-bodied, streamlined fish with large heads and eyes. The pectoral fins are very long, reaching back beyond the start of the second dorsal fin in juveniles and the space between the first and second dorsal fin in adults.

The California smoothtongue is a slender fish growing to a length of about . The dorsal fin has 9 to 12 soft rays, the anal fin 11 to 14, the pectoral fin 8 to 9 and the pelvic fin 8 to 10. The dorsal fin is set well back on the body and the tail fin is deeply forked. The pectoral fins are small and positioned low down on the belly.

The dorsal fin is small and begins behind the middle of the body, and has 11 soft rays. The anal fin is inserted on the posterior of the body and has 6 rays. The pectoral fin has 13-15 rays, some of which are elongated and extend beyond the point of origin of the dorsal fin. The pelvic fin has 9-10 rays, and the adipose fin is present.

It has a triangular first dorsal fin, widely separated from the second dorsal fin, which, like the anal and pectoral fins, is relatively small. There are the usual finlets of the tuna. There is a small corselet of small scales around the pectoral region of the body. Bullet tunas are blue-black on the back with a pattern of zig-zag dark markings on the upper hind body, and silver below.

Skeleton of the angler fish Lophius piscatorius: The first spine of the dorsal fin of the anglerfish acts as a fishing rod with a lure. The name "anglerfish" derives from the species' characteristic method of predation. Anglerfish typically have at least one long filament sprouting from the middle of their heads, termed the illicium. The illicium is the detached and modified first three spines of the anterior dorsal fin.

The mouth is horizontal and small. The minnow has eight dorsal fin-rays, seven anal fin-rays, eight pelvic fin-rays and thirteen to seventeen pectoral fin-rays.

There are several large black spots on the sides, one just below the dorsal fin, and another behind the pectoral fin. Its maximum size is about 10 inches.

The dorsal fin has 9 spines and 12 soft rays while the anal fin has 3 spines and 12 soft rays. They can grow to a length of .

The rear of the tip of the pectoral fins is black and the front edge of these fins is white, as is the tip of the dorsal fin.

They can grow to a fork length. The dorsal fin has 9 spines and 27 soft rays and the anal fin has 2 spines and 25 soft rays.

They live in colonies amongst each other and raise their young in the shells. Male Lamprologus ocellatus are larger, and have a yellow edge on the dorsal fin.

The upper jaw is broad and rounded at its end with a single row of large, widely spaced canines in both the upper and lower jaw. The dorsal fin is in two parts; the first consisting of 6 or 7 short, often unconnected spines while the second dorsal fin consists of a single spine followed by 26 to 28 sof rays. The anal fin is similar in appearance to the second dorsal fin, having two detached spines followed by one spine attached to 23 to 25 soft rays. Both the ventral and pectoral fins are short, with the ventral consisting of one spine followed by 5 soft rays and the pectoral having 17 rays.

The dorsal fin is in two parts, the first made of feeble spines and the second of soft rays headed by a single feeble spine, while the ventral profile is straight. The fin anatomy is highly useful for identification purposes, with the species having 11 spines in the first dorsal fin, with one spine and 20 to 23 soft rays on the second dorsal fin. The anal fin has two spines with 21 to 23 soft rays posterior to the spines. Lateral line scales and cheek scales are also distinctive, with northern whiting possessing 66 to 72 lateral line scales and cheek scales positioned in 3–4 rows, all of which are ctenoid.

The decoy scorpionfish has been noted on multiple accounts to display a unique prey-luring mechanism, involving the movement of its dorsal fin. The form of I. signifer's dorsal fin strongly resembles that of a small fish, with the fourth dorsal spine representing the dorsal fin of the lure fish, and a small black dot between dorsal spines 1-3 representing the eye. The decoy scorpionfish has developed a method of moving this fin so that it also behaves like a fish would. By moving the first dorsal spine in a figure-eight like pattern, the rest of the fin follows in a wave-like pattern of movement, while also moving laterally from side to side.

The position of the dorsal fin varies slightly among individuals, yet it generally originates anterior to the anal fin origin. The anal fin of the killifish is rounded, with the base of the fin being more than half the length of its longest rays. The distance from the origin of the dorsal fin to the end of the hypural plate is usually less than the distance from the origin of the dorsal fin to the preopercle, yet occasionally these distances are equal due to the genetic variability among individuals. An important characteristic of the fish is the length of the gill slit because it ultimately determines how much water can pass through the gills.

They have tiny conical teeth on the mandibles and on the vomer and palatine bones. There are two dorsal fins an anterior dorsal fin with 6 slender spines and a posterior dorsal fin with 13 to 18 soft rays, the pelvic fins have 1 weak spine and 5 branched rays and these are positioned anteriorly to the pectoral fins with their bases widely separated. The anal fin has only 15 to 25 soft rays and the pectoral fins have between 20 and 28 rays. They body is covered in ctenoid scales and the lateral line curves underneath the anterior dorsal fin to below the middle of the flank with the 2 or 3 scales nearest the head being keeled.

The first dorsal fin is moderately high, with the longest spine about as high as the soft dorsal-fin lobe is long, and is quite distinctive of the species. The anal fin consists of two anteriorly detached spines followed by one spine and 21 to 24 soft rays, with the pelvic fin having one spine and 18 or 19 soft rays. The lateral line has a moderately strong anterior arch with the junction of the curved and straight sections occurring vertically below the twelfth to fifteenth soft rays of the second dorsal fin. The curved segment of the lateral line is longer than the straight section, which contains no to six scales followed by 22 to 32 scutes.

There is a small bar on the tip of the lower lobe. The width of biggest lower caudal-fin lobe bar and/or the space between outermost bars is less than the diameter of the orbit. They doi not have any flank stripes and the tip of first dorsal-fin is dark, The barbels are white as is the belly while the flanks are rose-red darkening towards the back where there is some gold iridescence along the upper flanks and a dark saddle to the rear of the second dorsal fin. The body is uniformly brown, with a little dorsal darkening, with the bars and black first dorsal- fin tip still visible in preserved fish.

Two preocular spine and two lachrymal spines present. There are 9–11 supraocular spines, 10 spines in the first dorsal fin. Body cylindrical and posteriorly weakly compressed. Scales ctenoid.

The dorsal fin has 5 spines and 11 soft rays and the anal fin has 3 spines and 32-39 soft rays. This species attains a total length of .

The pectoral, pelvic, and spinous dorsal fins are hyaline to dusky, while the second dorsal fin is yellow distally. The caudal and anal fins are yellow to dusky yellow.

12590 – via Wiley Online Library. Antarctilamna ultima, first dorsal fin spine from the Waterloo Farm lagerstätte. . Reconstruction of Antarctilamna ultima hunting at the Waterloo Farm lagerstätte by Maggie Newman.

The dorsal fin and margin of the caudal fin may be brownish. The underside is plain white, becoming light brown on the tail. The largest known specimen is long.

Absalomichthys velifer is an extinct, prehistoric manefish that lived during the Upper Miocene of what is now Southern California. Its dorsal fin was huge in comparison with living species.

However, the two can be distinguished by the motion of the fin. Unlike most fish, the sunfish swings its dorsal fin and anal fin in a characteristic sculling motion.

This species grows to a total length of . The dorsal fin has 9 spines and 12 soft rays while the anal fin has 3 spines and 12 soft rays.

Shiner perches are distinguished from tule perches by having fewer dorsal fin spines, just 8–9 vs the 15–19 of the tule perch. The rayed part of the dorsal fin has 18 to 23 rays. The anal fin has 3 spines followed by 22–25 rays. They are one of the most common fish in the bays and estuaries of their range, favoring beds of eelgrass, and often accumulating around piers as well.

The holotype, a female, measures SL. Ground colour is dark brown; there are pale white blotches and mottling. Dorsal fin is narrowly edged with black or brown. The snout has a protruding, spinous lateral ridge, to which its specific name latispinosus refers: it is derived from the Latin latus (side) and spinosus (thorny). The dorsal fin has 22 rays, the pectoral fin has 20, the anal fin 4 and the caudal fin has 10.

Golden perch have an elongated, deep but laterally compressed body, with a sizable mouth, small to moderate-sized eyes, a distinct curve to the forehead, and a distinct "hump" above the head. The opercula or gill covers possess a small, flat spine sharp enough to cut unwary fishermen's fingers. The caudal fin, soft dorsal fin, and anal fin are rounded. The spiny dorsal fin is short to moderate in length and strong.

The first dorsal fin originates over the pectoral fin free rear tips, and the much smaller second dorsal fin originates over the last third of the anal fin base. The dorsal fins do not have a ridge between them. The lower lobe of the caudal fin is well-developed and the upper lobe has a ventral notch near the tip. This shark is plain gray, brown-gray, or purple-gray above, and white below.

The flippers are set back further along the body than in other similar dolphins, although, at sea this dolphin may be confused with spinner, spotted and bottlenose dolphins. The dorsal fin is pronounced, being from in height. The animal's flanks are a light gray, while the back and dorsal fin are a much darker gray. Older individuals often have distinctive pinkish, yellow, or white markings around the mouth and along the underside.

The rear part of the dorsal fin has 9-12 soft rays the longest being longer than the longest dorsal fin spines. The anal finhas 3 short spines and 7-10 soft rays and has a softly, rounded shape. The caudal fin is slightly emarginate. It is an attractive species which is silvery grey to silvery blue in colour on the body marked with many reddish- brown spots, apart from the abdomen.

There are five pairs of gill slits. The pectoral fins are fairly large. The first dorsal fin is angled backwards and originates over the rear of the pelvic fin bases; the second dorsal fin is similarly shaped and slightly smaller than the first, and originates over the front quarter of the anal fin base. Adult males have thin, tapering claspers that extend about two-thirds of the distance between the pelvic and anal fins.

The outer pair of mandibular barbels has three simple branches, and the inner pair has five or six simple branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. courteti, the spine of the dorsal fin is about half the length of the head, smooth in the front. The remaining portion of the dorsal fin is made up of seven branching rays.

Teeth are absent on the vomer, the small bone in the roof of the mouth, and the tongue has two longitudinal ridges. A little tunny The snout is shorter than the rest of the head. The little tunny has a dorsal fin with 10 to 15 tall, descending spines, as well as a much smaller second dorsal fin followed by eight finlets. At the base, the two dorsal fins are separated by a small interspace.

The front dorsal fin has three spines, the first being very strong and much longer than the other two. The second dorsal fin has 26 to 29 soft rays and is much the same size and shape as the anal fin directly below it which has no spines and 23 to 26 soft rays. The pectoral fins are small and rounded. The outer rays of the caudal fin are elongated in larger individuals.

The dorsal fin contains 11 spines and 14-15 soft rays while the anal fin has 3 spines and 8-9 soft rays. The membranes between the dorsal fin spines are deeply notched. The caudal fin is rounded. The adults have an overall colour of chocolate brown marked with pale spots and 9-10 dark vertical bars on the head and the body which extend on to the dorsal and anal fins.

Craterocephalus eyresii is a small drab yellowish-grey coloured fish with greenish-silvery underside, and a silver mid-lateral stripe which has some dark melanophores around it., and transparent to yellowish fins. There are two dorsal fins which are widely separated with the first dorsal fin originating before the tips of the ventral fins and the anal fin origin lies directly underneath the origin of second dorsal fin. The caudal fin isforked.

The first few rays of the dorsal fin are black, and both the dorsal and caudal fin are edged in a pinkish red. The anal and pelvic fins are the same shade of red throughout with bright blue rays and dots. The species displays only limited sexual dimorphism, mature males being slightly larger and in some cases showing longer extensions on both the caudal fin and the posterior of the dorsal fin.

Percarina is a genus of ray-finned fish in the family Percidae they are found in eastern Europe. The genus is the only taxon in the monotypic subfamily Percarininae which is characterised by having the first dorsal fin having 9-11 spines and being widely separated from the second dorsal fin. They are thought to be closely related both to the perches of the genus Perca and to the ruffes of the genus Gymnocephalus.

These fish have a light-colored tan body washed with hints of yellow and bluish-purple spots. The yellow is stronger along the upper portion of the body and onto the dorsal fin, and around the base of the pectoral fin. There are two vertical crescent-shaped bars just behind the eye highlighted with a bit of blue. The dorsal fin is lyre-shaped and they develop long flowing filaments on all unpaired fins.

The whale's skin is often marked by pits or wounds, which after healing become white scars. These are now known to be caused by "cookie- cutter" sharks (Isistius brasiliensis). It has a tall, sickle-shaped dorsal fin that ranges in height from and averages , about two-thirds of the way back from the tip of the rostrum. Dorsal fin shape, pigmentation pattern, and scarring have been used to a limited extent in photo-identification studies.

The remaining portion of the dorsal fin is made up of seven to eight branching rays. The spine of the pectoral fin is slightly curved, about as long as the dorsal fin spine, and ends in short, dark filament. The rest of the pectoral fins are made up of eight to nine branching rays. The adipose fin does not contain any rays, is long and well developed, and has a convex shape.

There is a lateral line and this is made up of an irregular series of pored scales. The dorsal fin has 7-9 spines in its front part, separated from the rear part by a deep notch, the rear part contains 7-10 soft rays. The anal fin is similar in shape to the soft part of the dorsal fin and has 3 spines and 7-8soft rays. The large caudal fin is rounded.

Researchers attached to the Far East Russia Orca Project (FEROP), co-founded and co-directed by Alexander M. Burdin and Erich Hoyt, first spotted the orca when its six-foot (two-metre) dorsal fin broke the surface near the Commander Islands in the Bering Sea in August 2010. He was living in a pod with 12 other orcas, and given the size of his dorsal fin was thought to be at least 16 years old.

Gymnogeophagus constellatus is a species of geophagine cichlid. It inhabits parts of the Uruguay and Río Negro rivers in eastern Rio Grande do Sul. It is characterised by the absence of supraneural bones, the presence of a forward spine in its first dorsal fin pterygiophore, the absence of an oblique bar between the eye and nape, possessing a black marking near the dorsal fin origin that projects to its dorsum, as well as other features.

As already noted, the large-headed whiting is very similar to Sillago sihama, but has a head length which is 33% of the body length, compared to the 27-30% observed in S. sihama. The first dorsal fin has 11 spines, while the second dorsal fin has a single spine and 22 soft rays. The anal fin is similar with two spines and 23 soft rays. There are about 70 lateral line scales.

The species reaches at least 20 cm in length. The body is a pale to dull brown colour, lighter on the underside of the fish and usually having a faint mid-lateral band below the lateral line. The fins are all hyaline in colour with the exception of the spinous dorsal fin which is dusky at the tips, with five or six rows of dusky spots on the membranes of the second dorsal fin.

The humpback dolphin is a coastal dolphin that can be found along the coast of Africa and India south to Australia, areas differing for separate varieties. The humpback dolphin has a hump ahead of the dorsal fin, as well as a careen on a ventral side. The dorsal fin of the humpback dolphin is to some degree falcate. The pectoral fins are considerably small and the tail flukes have a well-defined median notch.

The spiny dorsal fin of Murray cod is moderate to low in height and is partially separated by a notch from the high, rounded soft dorsal fin. Soft dorsal, anal, and caudal (tail) fins are all large and rounded, and are dusky grey or black with distinct white edges. The large, rounded pectoral fins are usually similar in colour to the flanks. The pelvic fins are large, angular, and set forward of the pectoral fins.

The membranes of the dorsal fin has distinct indentations between its spines. There are 47-56 scales in the lateral line. The dorsal fin has 9 spines and 14-15 soft rays while the anal fin has 3 spines and 8-9 soft rays. The colour of the body is orange-red to reddish brown with many small bright blue spots which cover the head, body and the dorsal, anal and caudal fins.

The teeth of sharks over long are finely serrated. The fins (especially the dorsal, pectoral, and pelvics) of the sicklefin lemon shark are more falcate (sickle-shaped) than those of the otherwise very similar American lemon shark. The first dorsal fin is positioned closer to the pelvic than the pectoral fins. The second dorsal fin, nearly equal to the first in size, is located over or slightly forward of the anal fin.

The red hind has a robust, compressed body which is deepest at the origin of the dorsal fin, the standard length being 2.7 to 3.1 times the depth. The gill cover has three flat spines on its margin. The preopercle has a finely serrated margin and protrudes slightly near its lower edge. The dorsal fin contains 11 spines and 15-16 soft rays while the anal fin has 3 spines and 8 soft rays.

Normally, an orangish-pink colour band will be present starting from below the eye along to the corner of the mouth. A white spot will appear behind the dorsal fin.

Their leptocephalus larvae are elongate, with a long, straight gut, a dorsal fin that originates in the latter half of the body, well-developed pectoral fins, and a long head.

The leading edge of the first dorsal fin and the trailing edge of the caudal fin may be dark, and the trailing edges of the pectoral fins may be light.

The dorsal fin has 10 spines and 10 soft rays while the anal fin has three spines and 10-11 soft rays. This species grows to a standard length of .

Hector's dolphin has a unique rounded dorsal fin. Hector's dolphin is the smallest dolphin species. Mature adults have a total length of and weigh .Slooten, E. and Dawson, S.M. 1994.

The dorsal fin is more than twice the length of the anal fin. The dorsal origin is nearer to the tip of the snout than to the caudal fin base.

The amount of dark pigment in the fins is sexually dimorphic, with males developing darker spinous dorsal fin, lobes of soft dorsal and anal fins, and pelvic fins than females.

Adults grow to 50 mm total length. It has three spines and seven soft rays in the dorsal fin with three spines and eight soft rayes in the anal fin.

The first dorsal fin is medium- sized and slightly raked. The second is similarly shaped, but a bit smaller. The pectoral fins are fairly large. Both dorsal spines are long.

The dorsal fin has 14 spines and 11-12 soft rays while the anal fin has 2 spines and 10-12 soft rays. It grows to 12 cm standard length.

The dorsal fin has seven branched rays and the general colour is silver with a few dark spots. There is a thin blue streak that runs along the lateral line.

The silvery body is covered with small scales. There is only one dorsal fin, a pair of pectoral and ventral fins. The anal fin and tail they have yellowish tones.

Body with 3–5 irregular vertical bars on anterior half. There are 14–17 pre-dorsal scales and 10–11 branched dorsal-fin rays. Danionin notch present. Lateral line complete.

Lesions in dolphins occur on the dorsal fin, head, flukes, and peduncle. In January 2006, a potential epidemic of lobomycosis was reported in dolphins of the Indian River Lagoon in Florida.

Spotted sand-divers reach a maximum length of . They have 39 to 41 soft dorsal spines. Males can be distinguished from females by their long dorsal fin rays and larger size.

The maximum recorded standard length is . It can be identified from the allopatric western jumping blenny by having a broad membrane separating the third and fourth spine in the dorsal fin.

This species can grow to in total length. It has 8 spines and 13 soft rays in its dorsal fin and 3 spines and 11 soft rays in its anal fin.

Pterygoplichthys gibbiceps is a species of armored catfish native to Brazil, Ecuador, Peru and Venezuela where it is found in the Orinoco and Amazon basins. Pterygoplichthys gibbiceps shows all the characteristic features of its genus—a large dorsal fin with more than nine rays, prominent nasal flares and a prominent hump or crest anterior to the dorsal fin as well as a substantial base to the dorsal fin. Adult fish easily attain a length of TL and can live for more than 20 years. A typical plec shape is shown, patternation consists of primarily irregular largish brown spots on a yellowish backgroung giving a honeycombed like appearance, additional pattern features common to related species may be visible on close inspection.

There is generally no sexual dimorphism exhibited between males and females and lifespan is typically from five to seven years. However, dimorphism does exist between juveniles and adults, with juveniles displaying a uniform, dark lateral stripe down the sides. Both sexes exhibit longitudinal scale rows, 4–18 dorsal fin rays, an air bladder with two chambers, dorsal fin base less than one-fourth standard length, and lateral line absent.Hubbs, C. L., R.J. Edwards and G.P. Garret. 1991.

Like other orders of the Ostariophysi, fishes of Cypriniformes possess a Weberian apparatus. They differ from most of their relatives in having only a dorsal fin on their backs; most other fishes of Ostariophysi have a small, fleshy adipose fin behind the dorsal fin. Further differences are the Cypriniformes' unique kinethmoid, a small median bone in the snout, and the lack of teeth in the mouth. Instead, they have convergent structures called pharyngeal teeth in the throat.

Small discrete black spots populate the anterior dorsal fin membrane, becoming more numerous toward the anterior half of the fin. The soft dorsal fin has a continuous grey band, running parallel to and close to the anterior edge of each ray. The membrane of the anal fin has similar black dots to the dorsal, but to a lesser extent. The pectoral fin and ventral fins are golden to hyaline while the caudal fin is hyaline with black dots.

The phantom bannerfish is a small-sized fish that can reach a maximum length of 17 cm. Its body is compressed laterally, with the first rays of its dorsal fin stretched in short white feather-like filaments. The background color is white with light chocolate to dark areas and a brown face mask covering the mouth, eyes and reaches to the base of the first rays of the dorsal fin. Its stretched snout has a small terminal protractile mouth.

Its colour fades to silvery white on the posterior portion of the belly. It has two dorsal fins, the first of which has a tiny spine at the front with the second and third spines being much longer. The anal fin lies directly below the posterior dorsal fin. The colour of the fins is pinkish-orange and larger fish have a line of brown spots on the membranes of second dorsal fin and the anal fin.

The dorsal fin has 10–14 rays; in front of it are the three spines that give the fish its name (though some individuals may have only two or four). The third spine (the one closest to the dorsal fin) is much shorter than the other two. The back of each spine is joined to the body by a thin membrane. The anal fin has eight to 11 rays and is preceded by a short spine.

The average length of a Rineloricaria catfish is about 13 cm (5 in) long. The fish are long, slender, have no visible barbels, an erect dorsal fin, a very thin caudal peduncle, and a narrow face. Coloration of the fishes are usually light brown with darker blotches, and have a dark dorsal fin. They are also covered with bony plates and have a sucker disk mouth, as is common with most fish in the family Loricariidae.

The first dorsal fin is moderately tall and falcate (sickle-like) in shape, with a rounded tip. The pectoral and pelvic fins are not falcate, rather having nearly straight rear margins. The anal fin is larger than the second dorsal fin, with long free rear tip and a strong notch in the rear margin. The dermal denticles are densely packed, each with 5-7 horizontal ridges (3 in juveniles) leading to a W-shaped rear margin.

The first dorsal fin is fairly large and triangular, with a blunt apex sloping down to a sinuous trailing margin; its origin lies over the free rear tips of the pectoral fins. The second dorsal fin is small and low, and originates over the middle of the anal fin base. There is no ridge between the dorsal fins. The caudal peduncle bears a deep, crescent- shaped pit at the origin of the upper caudal fin lobe.

The pelvic fins located just below the pectorals are modified into a suction disc. Both the anal and the single dorsal fin are very large, arising from around the middle of the body to where they overlap the small rounded caudal fin. The number of soft rays on the anal fin ranges from 37 to 42, distinguishing them from other species of snailfish which usually only have 36. The dorsal fin has 45 to 50 rays.

It has a large mouth, at an oblique angle, with thin, glassy, widely spaced teeth. These fish are highly variable in length, but an average length is 40.0 cm total length (15.7 in). The maximum length recorded for this species is 80.0 cm total length (31.5 in). Taxonomic distinguishing features include 67–70 dorsal fin soft rays, 60 anal fin soft rays, two unsegmented dorsal fin rays, and a caudal fin with long median rays free at the tips.

The fifteen-spined stickleback is an elongated fish with a long slender snout, an elongated caudal peduncle about one third of the total length, and a fan-like rounded caudal fin. The anterior dorsal fin consists of a series of fourteen to fifteen small, widely separated spines. The posterior dorsal fin and the anal fin are aligned and are similar in size and shape and located immediately anterior to the caudal peduncle. The pelvic fins consist of spines.

Plectropomus laevis has a body which is elongate and robust, with the standard length being 2.9 to 3.9 times the depth of the body. The preopercle is mostly rounded, with three large,downward pointing spines along the bottome half. The dorsal fin contains 7-8 spines and 10-12 soft rays while the anal fin contains 3 spines and 8 soft rays. The spiny part of the dorsal fin has a shorter base than the soft-rayed part.

It has a long, low dorsal fin (described as "very delicate") which extends along most of its back, folding into a groove at the fin's base when not in use. Its anal fin is roughly the same height as the dorsal fin, and extends over the posterior third of the fish's body. Its pectoral fins are small, and its caudal fin is forked. Its mouth is large and toothless, with a lower jaw that extends well beyond the upper.

A1 pod was the first pod identified by Michael Bigg and Graeme Ellis in 1972. Bigg’s pioneering photo-identification system actually originates from the regular encounter of a female whale with a distinctively torn dorsal fin. An online catalogue of the orcas of the northern resident community of the Pacific Northwest. The whale, named Stubbs, was re-sighted in 1973, which gave Bigg the idea of photographing the dorsal fin of each killer whale he and Ellis encountered.

An indistinct silver-yellow mid-lateral band extends across some specimens. The spinous dorsal fin is olive green with faint darker blotches, the second dorsal fin also a pale olive with rows of dark brown to blackish spots. The anal and ventral fins are pale yellow, the pectorals are pale yellow to pale brown with a well defined dark blue-black blotch at the base. The caudal fin is yellow to olive in colour with darker margins.

The dorsal fin contains 11 spines and 16-18 soft rays while the anal fin contains 3 spines and 10-12 soft rays. The membranes between the dorsal fin spines are notched with the third and fourth spines being the longest. The caudal fin is square. The adult females and the juveniles are normally pale grey to brown-grey marked with darker blotches and wavy lines that give a marbled appearance to the upper flanks and back.

Both dorsal fins are immediately preceded by stout, grooved spines, with the second much longer than the first. The small first dorsal fin has a rounded apex and a nearly straight trailing margin, with its origin lying behind the pectoral fins. The second dorsal fin is rather angular and has about double the area of the first, with its origin located opposite the midpoint of the pelvic fin bases. The pectoral fins are small and rounded.

The most distinctive feature is the rounded dorsal fin, with a convex trailing edge and undercut rear margin. The overall coloration appearance is pale grey, but closer inspection reveals a complex and elegant combination of colours. The back and sides are predominantly light grey, while the dorsal fin, flippers, and flukes are black. The eyes are surrounded by a black mask, which extends forward to the tip of the rostrum and back to the base of the flipper.

The cheek spines, located diagonally down from the eye on either side may be single or double. In total, the lined seahorse has eleven trunk rings, 34–39 tail rings, 16–20 dorsal fin rays, and 14–18 pectoral fin rays. The pectoral fin is level with the eye on each back side of the lined seahorse's head. The dorsal fin is located on the back of the skeleton and is level with the stomach–chest area.

The outer pair of mandibular barbels is longer than the inner pair, and is about the length of the head. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. caudalis, the spine of the dorsal fin is short, about the length of the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The banded butterflyfish grows to a maximum length of about . The dorsal fin has 12 spines and 19 to 21 soft rays. The anal fin has 3 spines and 16 to 17 soft rays. The colour of this fish is silvery with a slender black bar passing through its eye, two wide black bars in mid-body and a third wide bar that starts on the rear of the dorsal fin and continues to the caudal peduncle.

The fourth and fifth pairs of gill slits lie over the pectoral fin bases and are shorter than the first three. The pectoral fins are large and broad, with somewhat pointed tips and nearly straight trailing margins. The first dorsal fin has a narrowly rounded apex and originates over the front half of the bases of the small pelvic fins. The second dorsal fin is smaller and lower than the first, originating before the anal fin origin.

The first dorsal fin has a narrowed rounded apex and originates over the middle of the pelvic fin bases. The almost triangular second dorsal fin is much smaller and lower than both the first dorsal and the anal fins, originating behind the anal fin origin. The pelvic fins are small, with short and elongated claspers in males. The caudal fin has a distinct lower lobe and a strong ventral notch near the tip of the upper lobe.

The pectoral fins are rather long and broad. The first dorsal fin originates over the rear of the pelvic fin bases; the second dorsal fin is slightly larger and originates over the rear of the anal fin base. The pelvic and anal fins are long and low, and larger than the dorsal fins. The free rear tips of the pelvic fins may be fused together to some degree, but never completely; males have slender, pointed claspers.

These are absent on the underside of the head and body. The juveniles have a prominent dark brown streak above their lips and many of the spots on the head, body and median fins merge to form double spots. The dorsal fin has a yellow or gold margin to the membranes in its spiny part. The soft-rayed part of the dorsal fin and the anal fin are dusky away from their bases and have an distinct white margin.

The membranes between the dorsal fin spines are deeply notched. The caudal fin is rounded. The adults are dark brown in overall colour and are marked with 8 vertical series of faint white spots which are obscured by many extra pale spots and blotches which vary in size. the fins of adults are largely plain and have a similr colour to the body apart from a small number of pale spots along the base part of the dorsal fin.

The two dorsal fins have rounded apexes and are placed close together; the base of each fin measures about two-thirds its height. The rear of the first dorsal fin base is located behind the rear of the pelvic fin bases. The second dorsal fin is only slightly smaller than the first. The short, robust tail has skin folds running along either side, and terminates in a large caudal fin shaped like a triangle with blunt corners.

The body of the bumpnose trevally is a silvery green-blue above, becoming more silvery-white below, with a dark blotch present on the operculum. The spinous dorsal fin and the soft dorsal fin rays are black, while the anal fin is brownish, with the filaments and lobe often blackish. The caudal fin has black trailing and leading edges, and the pelvic fin is dusky to black. Juveniles often have five to seven vertical crossbars on their sides.

External granular papilla are present. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. dhonti, the spine of the dorsal fin is long, about as long as the head, is almost completely straight, is smooth on the front and serrated on the back, and ends with short, dark filaments. The remaining portion of the dorsal fin is made up of seven dark branching rays.

The outer pair of mandibular barbels has long, simple branches, and the inner pair has short and thick branches with secondary branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. fuelleborni, the spine of the dorsal fin is slightly shorter than the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The Gulf grouper has an elongate, robust and compressed body which is no deeper at the origin of the dorsal fin than it as the origin of the anal fin. It standard length is 3.1 to 3.4 times its depth. The preopercle is rounded, lackaing a lobe, and has a finely serrated margin. The dorsal fin contains 11 spines and 16-17 soft rays while the anal fin contains 3 spines and 10-11 soft rays.

The sailfin grouper has a body which is elongate, robust and compressed with its depth being the same at the origin of the dorsal fin as it is at the origin of the anal fin. The standard length is 2.9 to 3.1 times the body's depth. The preopercle is angular, with a serrated lobe at its angle. The dorsal fin contains 11 spines and 16-17 soft rays while the anal fin contains 3 spines and 11 soft rays.

The membranes between the dorsal fin spines are not deeply notched and the soft rayed part of the dorsal fin is rounded. The caudal fin is emarginate in adults and truncate in juveniles. The head and body are normally pale grey-brown in colour with numerous, closely set brown spots and they sometimes have 10-12 thin dark bars, which may be broken, on the upper body. The fin margins are dark, with narrow white borders.

M. nheco is like other doradids. It has three pairs of barbels (one pair maxillary, two pairs mental), strong dorsal and pectoral fin spines. M. nheco is differentiated from all other doradids by having its scutes with thorns directed ventrally in adults, and from all doradids except Physopyxis cristata by having an incomplete lateral line. It has a smooth dorsal fin spine, as opposed to a serrated one; the only other genus with smooth dorsal fin spines is Anadoras.

The distinct appearance of the Gangetic whiting makes it the easiest of the smelt whitings to identify. The head of the species is highly depressed, like that of the flatheads, with very small eyes well constricted by the orbits. The first dorsal fin contains ten spines including a large trailing second spine; the second dorsal fin has one spine and 25 to 27 soft rays. The anal fin has two spines and 24 to 27 soft rays.

External papilla are present on the head, but not the body. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. irsacae, the spine of the dorsal fin is short, about as long as the head, slightly curved, rough on the front and serrated on the back, and ends with short, dark filament. The remaining portion of the dorsal fin is made up of seven branching rays.

There are 42-50 tooth rows in the upper jaw and 42-48 tooth rows in the lower jaw. Each tooth has a single narrow, smooth-edged cusp at the center, flanked by a pair of much smaller cusplets. The first dorsal fin is positioned well back on the body, closer to the pelvic than the pectoral fins. The second dorsal and anal fins are large, about half to three-quarters as high as the first dorsal fin.

Juveniles and adult females both have a smaller, sickle-shaped dorsal fin. When surfacing the grey saddle shows up over the black back, behind the dorsal fin. It has a conical-shaped black head, with a distinctive white oval patch above and behind the eye, an indistinct beak, white throat and large paddle-shaped flippers. Minke whales are quite often seen in June and occasionally through to October but also at other times of the year.

The mandibular barbels have long, slender branches, and the outer pair is about as long as the inner pair. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. woosnami, the spine of the dorsal fin is about the length of the head, slightly curved, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

Illustrations by Edward Drinker Cope in 1876 Risso's dolphin has a relatively large anterior body and dorsal fin, while the posterior tapers to a relatively narrow tail. The bulbous head has a vertical crease in front. Infants are dorsally grey to brown and ventrally cream-colored, with a white anchor-shaped area between the pectorals and around the mouth. In older calves, the nonwhite areas darken to nearly black, and then lighten (except for the always dark dorsal fin).

There are 8 spines in the first dorsal fin with the first spine being very short, the second dorsal fin has a single spine and eight soft rays. The body is covered in large scales with a count of 28–29 in the lateral line. It is normally a rosy colour marked with three or four horizontal red lines along its body. The largest fishes may have a standard length of but they are more normally .

These fish are dark bluish-green dorsally and silvery white ventrally. The juveniles have golden bars on their upper flanks and these break up into large spots as the fish matures. The pectoral fin is vivid yellow and the caudal and spiny part of the dorsal fin both have a blackish margin. There are 9 spines and 15-17 soft rays in the dorsal fin and 3 spinesand 9-10 soft rays in the anal fin.

However, when compared side- to-side, it can be seen that on P. tetrazona, the middle body stripe extends completely through the dorsal fin. On P. partipentazona, the blotch on the dorsal fin is not part of any of the body stripes, the colors are brighter, and the anal fin shows red. Puntigrus partipentazona is an open water, substrate egg-scatterer, and adults do not guard the eggs. It spawns in dense plant growth, and its eggs are sticky.

The fish is colored dark black in dorsal area and blackish brown in side, the under side is silvery white and the dorsal fin is pale orange red in color. Fins (pectoral, pelvic, anal) are whitish-yellow in color except the caudal fin which is dirty yellow in color. There are some long black spots in the dorsal fin rays and in the caudal blotch there is a small patch of bluish black dots in a scale.

The Zambezi bream is a medium-sized species of haplochromine which has a large head with a rounded snout and an slightly, upward pointing mouth. It has a slender body with a relatively straight outline, a long dorsal fin and a truncated caudal fin. The dorsal fin contains 14-16 spines and 10-13 soft rays while the anal fin has 2 spines and 7-10 soft rays. The lateral line is in two sections and contains 36 scales.

Baton Rouge, LA: Claitors Publishing Division. The dorsal and anal fins are moderately high, about equally elevated, and slightly rounded at the tips. The margin of the dorsal fin is mostly straight, and the anal fin in emarginate. In both fins, the anterior rays are somewhat longer than the posterior rays when depressed. The dorsal fin has 8 (7-8) rays and its origin is slightly anterior to the pelvic fin, which has 8 (7-8) rays.

The membranes between the dorsal fin spines are not notched. The caudal fin is truncate or emarginate. The ovell colour of the head, body, and fins purplish grey to brownish grey, marked with brown to golden-brown spots on the head and wavy horizontal brown or golden brown lines on the upper body, although these may be indistinct on larger fish. The margin of the spiny part of the dorsal fin has a thin line of blackish colouration.

Overall, this species is very similar in appearance to its relative, the Mauve goby (Palatogobius paradoxus), however P. grandoculus has a much larger eye and shorter snout than P. paradoxus, as well as a much narrower band of skull between the orbits. Its body scales also extend forward on the sides, past the origin of the first dorsal fin, while other members of its genus have scales which only extend to beneath the second dorsal fin.

The dorsal fin originates from above the (relatively large) eyes and runs the entire length of the fish. Of the approximately 400 dorsal fin rays, the first 10 to 13 are elongated to varying degrees, forming a trailing crest embellished with reddish spots and flaps of skin at the ray tips. The pelvic fins are similarly elongated and adorned, reduced to one to five rays each. The pectoral fins are greatly reduced and situated low on the body.

They have jaws armed with bands of fine, pointed teeth. The cheek and operculum have lines of papillae which are also found around the preopercular margin and on each side of snout to above the eye. There are 3-5 large pores on the preopercular margin. It has two dorsal fins, the first, anterior dorsal fin, is rounded and has notches between its six spines and the second, posterior dorsal fin, is taller and slightly longer.

No anal fin, grooved dorsal fin spines, teeth with narrow cusps and cusplets in upper and lower jaws, uniform dark coloration Short abdomen and short caudal peduncle, close-set denticles on body.

There was one Congiopodid found in the shallow South American water. The adult's dorsal fin is relatively shorter than the juvenile's fin, but they all resemble yellow and orange dead tree leaves.

The single dorsal fin has 10 soft rays, while the anal fin and well-developed pelvic fins each have 9-10 rays. Chiselmouths can reach a length of 30 cm (12 in).

River dolphins swim by moving their tail fins and lower bodies up and down, propelling themselves through vertical movement, while their flippers are mainly used for steering. All species have a dorsal fin.

Tadpoles have a maximum length of about . Body is slender and horizontally compressed, with dorsal fin than is slightly higher than the body. Oral disk is terminal with expanded and upward-directed lips.

There is a single row of bony plates from the dorsal fin to the caudal peduncle on the top of the fishes body. The belonoglanis tenuis is long and thin. They are toothless.

Broad transversal unpigmented stripe present on dorsum. Dorsal fin yellowish white with small dark spots on the spine. Pectoral fin brownish grey dorsally, with small dark spots. Caudal fin is whitish and unpigmented.

The rear joint of the mouth extends past the level of rear margin of the adipose eyelid. The rear margin of the gill cover is serrated. They have two dorsal fins with the first dorsal fin having 8 spines and the second dorsal fin has a single spine and 11 to 13 soft rays while the anal fin has 3 spines and 10 to 15 soft rays. The base of the anal fin is shorter than the length of the head.

The spotted-belly catshark (Atelomycterus erdmanni) is a catshark of the family Scyliorhinidae. It is found in eastern Indonesia. This species differs from Atelomycterus baliensis in having white spots present over the body a larger first dorsal fin, paired fins closer together, and pelvic fin farther apart from the ventral caudal-fin origin. A. erdmanni differs from Atelomycterus marmoratus in having far less numerous white spotting a larger first dorsal fin, and the clasper glans about half length of clasper outer margin.

The lower teeth are much larger, with a strongly slanted, blade-like cusp at the top and interlocking bases. The five pairs of gill slits are tiny, comparable in size to the spiracles. Both dorsal fins bear stout, grooved spines at the front, with the second much longer than the first and curved. The first dorsal fin originates behind the short and rounded pectoral fins; the second dorsal fin is twice the size of the first and originates behind the pelvic fins.

The scamp grouper has a body which is elongate, robust and compressed with its depth being the same at the origin of the dorsal fin as it is at the origin of the anal fin. The standard length is 3.0 to 3.4 times the body's depth. The preopercle is angular, with an obvious bony lobe at its serrated angle. The dorsal fin contains 11 spines and 16-18 soft rays while the anal fin contains 3 spines and 10-12 soft rays.

The first dorsal fin is high and broad, with a pointed apex and a concave trailing margin; its origin lies roughly over the insertion (the rear of the fin base) of the pectoral fins. The second dorsal fin is relatively large and located about opposite the anal fin, which is about of equal size. There is no ridge between the dorsal fins. The caudal fin has a well-developed lower lobe and a ventral notch near the tip of the upper lobe.

There 8 to 11 of these rusty brown to dark brown bars running obliquely on the sides of the fish, often overlapping a distinct silvery white laterally positioned band. This band begins behind the operculum and continues to the caudal fin base. The spinous dorsal fin is whitish below grading to yellow above, with brown spots and black dusting apically. The second dorsal fin is white basally, becoming lemon yellow above with 3 rows of black blotches forming longitudinal lines across the fin.

Fishes of Texas Project and Online Database (www.fishesoftexas.org). Published by Texas Natural History Collection, a division of Texas Natural Science Center, University of Texas at Austin. 2012. In Fundulus olivaceus, the gill slit extends the dorsal to the uppermost pectoral fin ray. The distance from the origin of the dorsal fin to the end of the hypural plate is less than the distance from the origin of the dorsal fin to the preopercle or occasionally about equal to that distance.

The hardhead has an elongated, slender body which is brown to dusky bronze above, the larger fishbeing darkest, with silver sides. The dorsal fin has its origin behind that of the pelvic fin, It has 69-81 scales on its lateral line; the dorsal fin has 8 rays. The jaws are not extendable and there is a premaxillary frenum. The snout is long and pointed, ending with the large, terminal mouth which reaches back to the front of the eye.

The caudal fin and anal fin are dark. Juveniles have a medium blue grey body, a pale blue-grey lower head which is marked with orange spots and lines with the upper part of the head and the spiny part of the dorsal fin being green. They also have a blue grey soft rayed portion of the dorsal fin and a blue grey caudal fin with a black margin. The maximum tital length is but they are more commonly around .

Males grow to a length of 112 cm, while females grow a bit larger at 120 cm. Its coloration is dark brownish bars, over the dorsal and lateral surfaces, and its dorsal and upper surfaced paired fins contain vermicular patterns. The ventral surface of the trunk is pale, with nasal barbels with branches, with up to 3 simple lobes, along with 3 to 4 branched lobes. The dorsal fin grows tall, with the first dorsal fin near the pelvic fins.

The outer pair of mandibular barbels is about twice as long as the inner pair. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. budgetti, the spine of the dorsal fin is long and slightly curved, about as long as the head, bearing a long filament, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have long, slender branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. nigromaculatus, the spine of the dorsal fin is straight and long, about as long as the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both have long, slender branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. ocellifer, the spine of the dorsal fin is short, a little shorter than the head, smooth in the front and serrated on the back, and curved. The remaining portion of the dorsal fin is made up of seven branching rays.

The outer pair of mandibular barbels is a little under twice the length of the inner pair, and both pairs have short branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. macrostigma, the spine of the dorsal fin is about as long as the head, slightly curved, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have short, stiff branches near the base. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. multimaculatus, the spine of the dorsal fin is slightly shorter than the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have long branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. frontosus, the spine of the dorsal fin is short, about the length of the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

External granular papilla are not present. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. grandiops, the spine of the dorsal fin is long, about as long as the head, is almost completely straight, contains up to three small serrations on the front and many small serrations on the back, and ends with short, white filaments. The remaining portion of the dorsal fin is made up of seven branching rays.

External sort, flat papilla are present and give the skin a pebbled appearance. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. ilebrevis, the spine of the dorsal fin is short, about as long as the head, slightly curved, rough on the front and serrated on the back, and ends with short, dusky filament. The remaining portion of the dorsal fin is made up of seven branching rays.

Iniistius pavo can be identified by the dark vertical bar situated below the eye. This species has a small dark spot below the forward portion of the dorsal fin, a white patch behind the side behind the pectoral fin, and an oblique brown bar underneath the eye. It normally shows 5 dark bars when adult when the belly of female turns red. Juveniles have a black anal fin and two large eyespots which have narrow white margins in their dorsal fin.

The fourth spine in the dorsal fin is longer than the others and the membranes between the dorsal fin spines are slightly notched. The caudal fin is rounded in shape. This is a pale brown species which is covered in small dark brown spots, the upper body is whitish with the white being broken up by large dark blotches which resemble diagonal bands. There is a dark saddle-like blotch on the upper part of the base of the caudal fin.

The leopard coral grouper has a body which is elongate and robust, with the standard length being 2.9 to 3.9 times the depth of the body. The preopercle is mostly rounded, with three large,downward pointing spines along the bottome half. The dorsal fin contains 7-8 spines and 10-12 soft rays while the anal fin contains 3 spines and 8 soft rays. The spiny part of the dorsal fin has a shorter base than the soft-rayed part.

Oreochromis leucostictus is a relatively deep- bodied tilapia with a fairly small mouth, narrow, rounded head and high back. Juvenile are pale, countershaded and have around 8 thin faint dark bars on the flank beneath the dorsal fin, with other bars on the head and tail. The fins are faintly spotted and there is a rather vague dark 'tilapia mark' at the based on the soft dorsal fin. Adults of both sexes are characterised by white spotting on the flanks and fins.

External thin papilla are present but do not extend onto the fins. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. polli, the spine of the dorsal fin is short, about as long as the head, is slightly curved, is smooth on the front and finely serrated on the back, and ends with short, dark filament. The remaining portion of the dorsal fin is made up of seven branching rays.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have slender, simple branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. victoriae, the spine of the dorsal fin is slightly shorter than the head, straight, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of six to seven branching rays.

The sawtail grouper has a body which is elongate, robust and compressed with its depth being the same at the origin of the dorsal fin as it is at the origin of the anal fin. The depth of the body is less than the length of the head. The preopercle is angular, with a serrated lobe its angle. The dorsal fin contains 11 spines and 16-18 soft rays while the anal fin contains 3 spines and 10-12 soft rays.

The upper jaw projects further than the lower and the snout overhangs the mouth. There is a small barbel on the fleshy lower lip. The dorsal fin is divided into two parts. The number of spines and soft rays in the fins is indicative of the species and in M. americanus, the front part of the dorsal fin is broadly triangular and has 10 spines and the other part is long and has 1 spine and 22 to 25 soft rays.

The California lizardfish derives its name from its elongated cylindrical body and lizard-like head and mouth. The body is uniformly brown on its back, with its sides fading to tan and a white belly. It has a dorsal fin at its midback, no spinous fin rays, a small adipose fin, yellowish pelvic fins ahead of its dorsal fin with about eight or nine rays each, and a forked caudal fin. The longest fish recorded was long, and may weigh up to .

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have long, slender branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. zambezensis, the spine of the dorsal fin is slightly curved, short, about as long as the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

There are teeth are found on the centre of the roof of the mouth and on the tongue. The dorsal fin is a similar height along its length The anterior part of the dorsal fin has 11 spines which fold down into a scaled furrow while the posterior part contains 10-12 rays. The anal fin has three spines and 10-12 moderately long soft rays and is reasonably long at its base. The symmetrical caudal fin is forked but not extremely so.

The large pectoral fins measure around one-fifth as long as the body, and have a falcate (sickle-like) shape tapering to a point. The first dorsal fin is of moderate size and somewhat falcate, with a pointed apex and a strongly concave rear margin; its origin lies over the pectoral fin free rear tips. The second dorsal fin is much smaller and is positioned about opposite the anal fin. A low dorsal ridge is present between the dorsal fins.

Occasionally, Jaws will appear on the map in the form of its familiar dorsal fin breaking the water's surface. If players collide with Jaws' dorsal fin, they can momentarily control their boat in the side-view encounter in an attempt to attack Jaws with depth charges. Jaws will always collide with the boat and release the diver into the water. Jaws will also appear after a brief moment if the player snags something in the overhead map with Jaws nearby.

According to the fossils of L. californica, the living animals were very slender, and had a long, fringe-like dorsal fin running almost the entire length of the body, from the head to the tip of the tail. The dorsal fin forms two crests, a first, low crest on top of the back of the head, and a second, large crest near the upper back, above the pectoral fins. The name comes from discoverer of the fossil, Melvin E. Layton.

It has no anal fin, but two dorsal fins approximately equal in size. The first dorsal fin originates about halfway from the tip of the snout to the tip of the caudal fin, the origin of the second dorsal fin is posterior to the tips of the pelvic fins. It has large pectoral fins, that's inner margins curve inward toward the base of the fins. There are dermal denticles on the dorsal surface of the body with very little overlapping.

The Burrunan dolphin is dark bluish-gray at the top near to the dorsal fin extending over the head and sides of the body. Along the midline, it is a lighter gray which extends as a blaze over on the side near the dorsal fin. Ventrally, it is off-white, which reaches over the eye and the flipper in some instances. It is smaller than the common bottlenose dolphin, but larger than the Indo-Pacific bottlenose dolphin, measuring between in length.

Its second dorsal fin has six or seven rays. Its first anal fin, which is similar in shape and size to the second dorsal fin, has 13 to 16 rays, and the second anal fin has six or seven rays. The pectoral fins, which have 19 to 22 rays, are long and narrow and can be drawn in to the sides of the body. The pelvic fins are shorter than the pectorals, have a poorly developed membrane, and are depressible into ventral grooves.

The redmouth grouper is laterally compress and oval shaped with a relatively deep body which is around half of the standard length and a large head. The dorsal profile of the head is straight or slightly concave while the anterior dorsal profile between the eye and the origin of the dorsal fin is convex. It jaw extends past its eye. The dorsal fin has 9 spines and 17-18 soft rays while the anal fin has 3 spines and 8-9 soft rays.

The spines in the dorsal fins of female are alternately dark and uncolored whereas all the spines in the males dorsal fin are colorless, the membrane in the dorsal fin being clear in females and spotted in males. The cheek, gill cover and breast are scaleless while the belly and nape are scaled. When spawning the males darken, to almost black, on the head and the fins become more intensely colored. The maximum published total length is , although around is more common.

It is sexually dimorphic; the males are more brightly-coloured than the females with an elongated second ray in the second dorsal fin and an elongated anal fin. When breeding, the males develop a red nuptial stripe which runs from the snout to the second dorsal fin. The males are territorial and defend their territories from other males. Over a period of several days, the females lay eggs which stick to aquatic plants by an adhesive thread on the outside of each egg.

Merluccius polli has a large head which has a small depression in the cranium, the head is equivalent to just over a quarter of the fish's standard length. The lower jaw and premaxillary have small teeth, the lower jaw is slightly projecting. It has short, thick gill rakers which have blunt tips; and number 8-12 on the first arch. The anterior dorsal fin has a single spine and 8-11 fin rays and the posterior dorsal fin has 37-41 rays.

250px In the early 1970s, Bigg and his colleagues discovered that individual killer whales can be identified from a good photograph of the animal's dorsal fin and saddle patch taken when it surfaces. Variations such as nicks, scratches, and tears on the dorsal fin, and the pattern of white or grey in the saddle patch, are sufficient to distinguish killer whales from each other. Although it had been recognized that some animals could be identified from obvious distinctive features such as scars, Bigg and his colleagues discovered that the dorsal fin and saddle patch area of every killer whale was sufficiently distinctive to allow the individual to be reliably identified at sea using photographic techniques. The technique enabled the local population of killer whales to be counted each year rather than estimated.

The dorsal fin is in two sections, the first consisting of eight spines and the second of one spine and 28 to 31 soft rays, with the lobe of the second dorsal fin being slightly falcate in younger individuals, but is always shorter than the head length. The anal fin has two detached spines followed by one spine attached to 24 to 26 soft rays, while the pelvic fin has one spine attached to 21 or 22 soft rays. The lateral line has a very slight anterior arch, with the intersection of the straight and curved sections between the 15th and 19th soft rays of the dorsal fin. The curved section contains 96 to 106 scales, while the straight section contains 20 to 30 scales and 21 to 28 scutes.

Giganthias are characterized by nine spines on the dorsal fin. The third dorsal spine and the pelvic spines have serrated tips. The lateral line is very highly arched and a supplementary maxillary is present.

Contributions in Science, 246. Natural History Museum, Los Angeles County PDF. The photophore is found on the dorsal fin of the pacific viper. The photophore uses bioluminescence to produce light to entice a victim.

There are 6–8 supraocular spines, 9 spines in the first dorsal fin and 34–39 pored lateral-line scales. Body cylindrical and posteriorly weakly compressed. Scales ctenoid. Opercle with upper and lower spines.

Spiny dorsal fin medium height and strong. Mouth and eyes are relatively small. Colouration can vary from tan to (more commonly) dark purplish-grey to black. The irises of the eyes are distinctly silver.

As suggested by the common name, it has a uniformly dark first dorsal fin, lacking the contrasting blotch seen in many species in the genus. It also has a black margin to its snout.

They are iridescent greenish-blue above and silvery below while the dorsal fin has a lot of black in it and the pectoral fins are greyish. It grows to a length of around to .

Males will often have a yellow stripe that runs along the base of the dorsal fin. Both males and females will have a tail that tapers into the body, giving them the 'swallowtail' appearance.

No adipose fin can be found after the dorsal fin on its back. The caudal fin or tail fin is notched and homocercal. This means that the tail has two lobes that are symmetrical.

It can be distinguished from A. gollum due to having fewer dorsal fin rays, vertebrae, and lateral scales, as well as its pectoral fin rays extending beyond the margin of the membrane, forming filaments.

The redband darter can reach a length of TL though most only reach about . The common name refers to the breeding males which develop red bands along their flanks and on the dorsal fin.

It also has a venomous spine in front of its dorsal fin, which is used in defense. Ghost Shark(Hydrolagus trolli)/ Females mature around in body length and males at . The species is oviparous.

Rostral fold developed and overlapping upper lip. Maxillary barbels present, whereas rostral barbels are rudimentary or absent. There are 10–12 branched rays on dorsal fin. There are 36–39 scales on lateral line.

The highfin carpsucker is generally around long, with a maximum recorded length of . A silvery fish, it receives its specific name "velifer" from its exceptionally long dorsal fin. It can live for about twelve years.

They have a serrated spiny dorsal fin ray; the pelvic fin usually has 8 or 9 rays. The anus is at the anal fin, there is no photophore. Their maximum size is probably around 100cm.

The snout, lips and opper portion of the head are tinted with red and the spines in the dorsal fin are occasionally marked with red streaks. This species attains a maximum recorded total length of .

It possesses small teeth. Each opercle of the gill covers has a distinct notch on its rear edge. The second dorsal fin is much longer than the first. The pectoral fins are long and pointed.

A Field Guide to Coastal Fishes From Maine to Texas. 2011. Johns Hopkins University Press. pg 86. Both the dorsal and caudal fins are black, and the dorsal fin is fully connected at its base.

The first dorsal fin is large, high, stiff, and angular or somewhat rounded. The second dorsal and anal fins are minute. The caudal peduncle has a couple of less distinct keels. The teeth are gigantic.

This fish has three cone pigments for colour vision (like humans); its dorsal fin has a very sharp spine. The spine has been reputed to be venomous, but no serious injuries have yet been reported.

It is characterized by its robust body, large head and a dark blotch or smudge on their dorsal fin. The Sandhills chub has fine scales, a pinkish body and can be up to 9.4 inches.

The common remora has a suckerlike dorsal fin and an anal fin. Its body can be brown, black or grey in color.Smith's Sea Fishes, 6th edition. Edited by Margaret M. Smith and Phillip C. Heemstra.

Bagarius species have a broad head that is moderately or strongly depressed. The mouth is broad and terminal or slightly inferior. The gill openings are wide. The dorsal fin and pectoral fins have strong spines.

The overall colour of the Slender whiting is a light sandy brown, with two series of faint blotches running laterally. The upper row of these blotches has about 8 or 9 spots while the lower mid- lateral row has 10 spots. A row of indistinct spots or blotches runs along the base of the first, spinous dorsal fin, whose anterior most interspinous membranes are dusted with black spots. The membrane of the second dorsal fin dusted with black, while all other fins are hyaline in appearance.

The smelt- whitings are all very similar in their body morphology and external anatomy, with the Soringa whiting no exception. The species has a slightly compressed, elongate body tapering toward the terminal mouth, with a concave-up dorsal profile and a straight ventral profile. The maximum reported size for the Soringa whiting is 15 cm. The fin anatomy is highly useful for identification purposes, with the species having 11 spines in the first dorsal fin, with one spine and 21 soft rays on the second dorsal fin.

Originating below the fourth pair of gill slits, the pectoral fins are short, broad, and falcate (sickle-shaped) with pointed tips. The first dorsal fin is tall and falcate with a distinctively long free rear tip, and is positioned just behind the pectoral fin bases. The second dorsal fin is large and tall without a notably elongated free rear tip, and is positioned over or slightly behind the anal fin. Usually there is no midline ridge between the dorsal fins, and when present the ridge is slight.

Dermatolepis dermatolepis has a body which is at least twice as deep as its standard length which is at its deepest at the origin of the dorsal fin and laterally compressed. The dorsal profile of head is steep and the eye has a diameter which is less than the length of the snout. The caudal fin is rounded and the pectoral fins are short. The dorsal fin contains 11 spines and 18-20 soft rays while the anal fin has 3 spines and 9 soft rays.

The sicklefin smooth-hound (Mustelus lunulatus) is a houndshark of the family Triakidae. Even some species look similar to Carcharhinus family, mustelus second dorsal fin is much bigger. It is found on the continental shelves of the eastern Pacific, between latitudes 33° N and 7° N. The difference between sharptooth smooth-hound (Mustelus dorsalis) and mustelus lunulatus, is that the lunulatus second dorsal fin origin far in advance of the anal fin. It can reach a length of up to 1.7 m (5 ft 7 in).

There are two dorsal fins; the first is long and spiny, and is followed immediately by the second, which contains 1 tiny spine and 11–14 soft rays. The anal fin originates opposite the second dorsal fin and consists of 2 free spines followed by 1 spine and 10–12 rays. The dorsal and anal fins are followed by 6–7 finlets. There are two lateral lines, with the upper running to the rear of the first dorsal fin and the lower running to the caudal peduncle.

The colouration of this species is sexually dimorphic, the males are more intensely coloured having a violet body with a yellow back, the yellow colour continuing on to the upper lobe of the caudal fin and the dorsal fin has a purple margin.. The females are normally lavender in colour and have a yellow back and caudal fin. The males also have two yellow-tipped filaments at the origin of the dorsal fin which they use when displaying. The maximum total length recorded is .

There is a pale orange band running from end of the upper mandible to the origin of the dorsal fin and this intensifies dark orange red in breeding males. When looked at from above this band joins the folded dorsal fin to make an extended red band along the back. The rear margin of the caudal fin changes colour from whitish or yellow to bright red. In the females the body is yellow towards the back with lavender scales each with a yellow spot in the centre.

The membrane of the dorsal fin is notched between the front spines. The adults have a pale grey-brown body with around 9 dark vertical bars along the flanks. The head is dark with diagonal pale bands, a patterning of blue and orange spots and a large dark blotch just to the rear of the eye. The dorsal fin spines are dark while the membrane is pale while the soft rayed part of that fin is dark with a pale line along its base.

This genus is easily distinguished from other sisorids by having an adhesive apparatus on the thorax with grooves parallel or oblique to the longitudinal axis of the body, as opposed to grooves transverse to the longitudinal axis of body or the thoracic adhesive apparatus entirely absent. The dorsal fin and pectoral fins have strong spines. The dorsal fin spine is smooth or serrate on the front edge and smooth or finely serrated on the posterior edge. The pectoral fin spine is serrated on the front edge.

Ischyodus is an extinct genus of cartilaginous fish belonging to the subclass Holocephali, which includes the modern-day chimaeras. Fossils are known from Europe (including Russia), North America, and New Zealand. Ischyodus was rather similar to the present-day chimaera Chimaera monstrosa, which is found in the Atlantic Ocean and Mediterranean Sea. Just like C. monstrosa, Ischyodus had large eyes, a long whip-like tail, small lips, large pectoral fins and dorsal fin, and a dorsal spike attached to the front of the dorsal fin.

Serrasalmids are medium- to large-sized characiform fishes that reach about long, generally characterized by a deep, laterally compressed body with a series of midventral abdominal spines or scutes, and a long dorsal fin (over 16 rays). Most species also possess an anteriorly directed spine just before the dorsal fin extending from a supraneural bone; exceptions include members of the genera Colossoma, Piaractus, and Mylossoma. Most serrasalmids have about 60 chromosomes, ranging from 54 to 62.Metynnis has 62 chromosomes, as does Catoprion, Pristobrycon striolatus, and Pygopristis.

There is a dark brown streak below the eye and a very large black spot on the underside just anterior to the anal fin. There are three short rows of forward pointing spines on the caudal peduncle. The anterior part of the dorsal fin consists of three spines which can be retracted into a groove and the separate posterior part has 23–26 soft rays. The anal fin is very much the same shape as the posterior dorsal fin and has 21–23 soft rays.

The lesser weever is littoral and benthic, living on sandy, muddy bottoms, ranging from a few meters deep to 150 m (in winter). Resting on the bottom, its position can be described as with eyes buried and the tip of the first dorsal fin exposed. Because of its venom and its occurrence near beaches, it is considered to be one of Europe's most dangerous weever species. The venom glands are located on its first dorsal fin, which is completely black, and on the gill cover.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have moderately long, simple branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. obesus, the spine of the dorsal fin is about times to as long as the head, slightly curved, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have short, simple branches, with secondary branches on the inner pair. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. nebulosus, the spine of the dorsal fin is slightly shorter than the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

Lancetfish possess a long and very high dorsal fin, soft-rayed from end to end, with an adipose fin behind it. The dorsal fin has 41 to 44 rays and occupies the greater length of the back. This fin is rounded in outline, about twice as high as the fish is deep, and can be depressed into a groove along the back. The body is slender, flattened from side to side, deepest at the gill covers, and tapers back to a slender caudal peduncle.

Long-finned pilot whale skeleton Pilot whales are mostly dark grey, brown, or black, but have some light areas such as a grey saddle patch behind the dorsal fin. Other light areas are an anchor-shaped patch under the chin, a faint blaze marking behind the eye, a large marking on the belly, and a genital patch. The dorsal fin is set forward on the back and sweeps backwards. A pilot whale is more robust than most dolphins, and has a distinctive large, bulbous melon.

External granular papilla are present and extend onto all of the fins. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. granulosus, the spine of the dorsal fin is long, about as long as the head, is almost completely straight, is smooth on the front and serrated on the back, and ends with short, black filament. The remaining portion of the dorsal fin is made up of seven to eight branching rays.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have short, simple branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. nigrita, the spine of the dorsal fin is straight or slightly curved, to 1 times the length of the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The tiger grouper has a body which is elongate, robust and compressed, its depth being the no greater at the origin of the dorsal fin as it is at the origin of the anal fin, and a large mouth. The standard length is 3.1 to 3.6 times the depth of the body. The preopercle is rounded and does not have a lobe at its angle. The dorsal fin contains 11 spines and 15-17 soft rays while the anal fin contains 3 spines and 11 soft rays.

This starts with courtship, the male and female then form a pair before ascending to the surface where they release eggs and milt. The spawning season runs from May to August in the Mediterranean and the eggs and larvae are pelagic. This species feeds mainly on small benthic invertebrates such as worms and small crustaceans. The sailfin dragonet has three upwardly directed spines on the preoperculum and differs from other species of dragonet by having a first dorsal fin which is lower than the second dorsal fin.

The second dorsal fin is yellowish with bright blue longitudinal stripes and they have bright blue marks on the head and body. The females and immature males are brown, paler on the underside, with a series of 6 brown blotches along their flanks. There are three symmetrical brown saddle-like blotches along the back with indistinct darker longitudinal stripes on their second dorsal fin. The females are normally smaller than the males with an average total length of long and the larger males grow up to .

Thin papilla are present all over the head and body, but do not extend onto the fins. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. melanostictus, the spine of the dorsal fin is long, about as long as the head, slightly curved, smooth on the front and serrated on the back, and ends with short, black filament. The remaining portion of the dorsal fin is made up of seven branching rays.

The dorsal fin contains 11 spines and 14-16 soft rays and the anal fin has 3 spines and 8 soft rays. The caudal fin is rounded. The colour of the head and body is pale and they are largely covered in many dark olive-brown to reddish-brown polygonal spots which are set close together with pale spaces between them and forming a reticulated pattern. There are four dark saddle- like blotches, three along the base of the dorsal fin and one on the caudal peduncle.

Both jaws contain narrow bands of villiform teeth, with these bands becoming wider anteriorly. The dorsal fin is in two parts, the first containing 7 spines and the second of 1 spine followed by 25 to 28 soft rays. The anal fin is similar to the second dorsal fin, consisting of two anteriorly detached spines followed by 1 spine and 21 to 24 soft rays. The lobes of the dorsal and anal fins are slightly pronounced, and the pectoral fin is falcate, being longer than the head.

In the Pseudochrominae the pelvic fin has a single spine and five rays which are branched, the head is covered in scales, there are teeth on the palatine bone and there are 16-20 rays in the pectoral fin. The lateral line is divided into two, with a longer part running from the head to the posterior part of the dorsal fin and located just below the dorsal fin and the other, shorer part on the rear of the flanks. They grow to a maximum length of .

Thomas, Pete, "SeaWorld killer whale's severe injury: accident or battle wound? ", GrindTV, October 1, 2012 Nakai is one of the only captive males over the age of 10 to not have a collapsed dorsal fin, other males such as Ikaika and Trua are younger, have shorter fins, and have fully collapsed dorsal fins. Nakai's dorsal fin is nearly tall and is slightly leaning to the left. The right side of his tail fluke is curved under but the left side has yet to curve.

The species has 24 vertebrae, 10 upper and 14 lower. The dorsal fin is divided into two segments; a short, high fin containing eight spines and a second, long fin consisting of one spine followed by 20 to 23 soft rays. The anal fin has 2 detached spines followed by a single spine connected to 17 to 19 soft rays. The lateral line has a moderate anterior curve before, intersecting the straight section between the twelfth and fourteenth soft rays of the second dorsal fin.

The paradise threadfin is a medium-sized species of threadfin which attains a maximum length of , although the type of measurement used was not given, a more normal length is a total length of . It has a pointed snout and the head's dorsal profile is almost horizontal. There are two separate dorsal fins, the first dorsal fin has 8 spines with each one having a base of a similar size to the others. The second dorsal fin contains a single spine and 14 or 15 soft rays.

Younger individuals show a more silver blue dorsally, and have six dark crossbars visible on the body past the pectoral fin base. There is a distinct blackish blotch on the upper margin of the operculum. The first dorsal fin is pale grey to black, while the second dorsal fin and anal fin are both hyaline to black. The pectorals are dusty hyaline, the pelvics are usually black with a white leading edge and the caudal fin is also hyaline, with a dusty trailing edge.

Arnoglossus imperialis is a flatfish which has a short snout, shorter than diameter of eye. The eyes are separated by a bony ridge with the lower eye slightly in front of the upper eye. It has 95-106 rays in its dorsal fin and 74-82 in its anal fin, the males have the second to sixth dorsal fin rays elongated and thickened, in the females and it is the second to fifth. The lateral line has 51-66 scales and curves above the pectoral fin.

Dorsal view of a Dall's porpoise Dall's porpoises can be easily distinguished from other porpoises and cetacean species within their range. They have a wide, robust body, a comparatively tiny head, and no distinguished beak. Their flippers are positioned at the front of the body and a triangular dorsal fin sits mid-body. Patterns of coloration are highly variable, but Dall’s porpoises are mostly black, have white to grey patches on the flank and belly, and frosting on the dorsal fin and trailing-edge of the fluke.

The eastern freshwater cod is a small to medium-sized grouper-like fish with a deep, elongated body that is round in cross section and a broad, scooped head, and a large mouth lined with pads of very small needle-like teeth. The jaws are equal, or the lower jaw may protrude slightly. The eyes are slightly larger and more prominent than in Murray cod. The spiny dorsal fin is moderate in height and is partially separated by a notch from the high, rounded soft dorsal fin.

There are 13 fin rays in the pectoral fins, 10–11 rays in the dorsal fin, 8–9 rays in the pelvic fins, and 8–9 rays in the anal fin. The pelvic fins are elongated, and there may be an adipose fin. The body is transparent, covered by thin scales. There are four pairs of blotches on the peritoneal cavity beneath the gut, a line of chromatophores below the lateral line to the position of dorsal fin, and two blotches on the base of the tail.

The king threadfin is a large threadfin which can attain a maximum total length of and a maximum published weight of , although the more common total length is . It has a pointed snout and the dorsal profile of the head is almost flat in young fish and concave in adults. There are two separate dorsal fins, the first dorsal fin has 8 spines and the second spine is thicker than others. The second dorsal fin has a single spine and 11 to 13 soft rays.

The capacious mouth forms a wide arch and lacks furrows at the corners; the upper teeth are exposed when the mouth is closed. There are around 60 upper and 44 lower tooth rows; each tooth has a strong central cusp flanked on either side by 1-2 tiny cusplets. Of the five pairs of gill slits, the third pair is the longest. The first dorsal fin is positioned about opposite the pelvic fins; the second dorsal fin is much smaller and placed opposite the anal fin.

Like other members of the perch family the zander has a split dorsal fin with the first dorsal fin having 13 - 20 spines and 18-24 soft rays, while the anal fin has 2-3 rays and 10 - 14 soft rays. The caudal fin is long and forked. The zander has a maximum published standard length of , although they are more commonly found at around . This species can reach "International Angling Rules" (IGFA) Accessed 19 November 2008) of weight, although typical catches are considerably smaller.

Females up to 2.75 inches (6 cm). The male is larger with more color, also the tail fin and dorsal fin are more extended. They have also more beautiful colors, and extensions in the caudal fin.

Alfred A. Knopf, Inc., New York. 720 p. The dorsal fin usually has seven or eight spines and 19-20 soft rays, while the anal fin has two or three spines and 16-18 soft rays.

It is distinctively coloured, generally pale yellow with three broad, dark, vertical bars on its body. A further diagnostic trait is the presence of a deep notch between the first two spines of the dorsal fin.

Stethacanthus comes from the Greek στῆθος (stēthos), meaning "chest", and ἄκανθος (akanthos), meaning "spine" or "thorn". The name refers to the distinctive anvil-shaped first dorsal fin and spine displayed by mature males of the genus.

Males also exhibit somewhat of an orange tinge in their fins, with the exception of the caudal (tail) fin. The male also has longer fins, with a more pointed dorsal fin and extended anal fin rays.

The only relieving bit of color is a glow of red in the rear portion of the anal fin (only in males). The dorsal fin is fairly short. It has a small mouth with enlarged lips.

Tilikum was a large bull orca; the largest in captivity. He measured long and weighed about . His pectoral fins were long, his fluke curled under, and his dorsal fin was collapsed completely to his left side.

The body is brownish grey with yellow nape and there is a broad black band on the dorsal fin. It reaches about 45 cm in length. It can be found on coral reefs, often in pairs.

The orcas feature black and white coloring, a large dorsal fin up to , and enormous strength and size — males can be . The whales travel in pods of up to 30 individuals and can swim up to .

A. praedorsalis is the largest species in the genus, with a typical length of 147 millimeters. The specific name refers to how the large dorsal fin is placed more anteriorly in comparison to the other species.

This fish is pinkish white in color and has no eyes. It grows up to in total length. The dorsal fin has no spine. The adipose fin is joined to the caudal fin, which is unforked.

Electrically actuated single slot flaps are fitted. Fin and rudder are swept, with a small dorsal fin; the rudder is horn-balanced. The tailplane is rectangular and set a little above the fuselage, carrying inset elevators.

It is the genus' type species, and indeed seems to represent a quite distinct lineage of large "barbs". It is not very similar to the barbels which are the core of the genus Barbus, and though closer to these than to some African barbs, they seem to be closer still to the common carp (Cyprinus carpio) and to Cyclocheilichthys than to either of the aforementioned. It is distinguishable from other species of the genus in having a red dorsal fin with a black blotch at the tip, red pectoral, pelvic and anal fins, red caudal fin with white margin and a black submarginal stripe along each lobe, and 8 scale rows between dorsal-fin origin and lateral line. Large individuals are silvery or golden yellow while alive with its dorsal fin red and caudal fin orange or blood-red.

The gill openings are relatively narrow and the eyes are small. In the Parakysinae, the dorsal fin has four soft rays. The pectoral fin spine is not serrated. The anal fin has eight to 13 soft rays.

During the initial phase, the colouration varies greatly from blue-green to green to solid olive. The fins are mottled brown to red and have two white stripes. Behind the dorsal fin, a white spot is present.

This fish species reaches about 5.9 centimetres (2.3 in) SL. The male is smaller than the female and in proportion to body length, the dorsal fin and pectoral fins are longer on the male than the female.

The lower pharyngeal bone is slender, with numerous crowded teeth. There are 3–5 upper gill rakers, 1 on the angle and 19–23 lower rakers. The dorsal fin has 15–18 spines and 11–13 rays.

The maximum recorded total length for this species is but a more normal standard length is . There are 9 spines and 12 rays in the dorsal fin and 3 spines and 12 rays in the anal fin.

The pectoral fins were strong enough for the animal to "walk" around the sea floor in search of a hiding place between coral colonies. The posterior dorsal fin was quite powerful, providing quick speed for capturing prey.

Dorsal-fin with 2 or 3 simple and 7½ branched rays; pectoral-fin with 11-13 rays; pelvic-fin with 8 rays; anal-fin with 3 simple and 5½ branched rays; caudal-fin branched rays 8+8.

The colour of this fish is greyish-brown with paler underparts. There are reddish bony ridges on the head and the spinous dorsal fin is black with a white base. The caudal fin has a white margin.

Caudal fin reddish with dark margin. The ventral surface is whitish. The first dorsal fin is low with the tips of the spines extending beyond the membrane and these may be longer in males than in females.

These fish are aptly named; their rounded, compressed bodies are completely covered (with the exception of the caudal peduncle) with very large, strong, platelike scales called scutes, which are fortified with prominent ridges. The first dorsal fin is composed of four to seven strong, disunited spines which vary in length; the second dorsal fin and anal fin are small, spineless and rounded, situated far back of the convex head. The pectoral fins are somewhat elongate and the caudal fin is truncate. Coloration is typically a yellow to orange, with the scales dramatically outlined in black.

In some P. tigris, though specimens have similar colour patterns, they may differ in thickness of the tan bars and dark bars, body depth, and eye position. The body of these fish is very dorsoventrally flattened with both ventral- and dorsal-surface flat. The dorsal fin spine is weak, and the dorsal fin spinelet supports odontodes. The pectoral fins are usually elongated, reaching the anus in juveniles and growing to the anal fins in the adults; P. anthrax has been referred to as "flying catfish", probably due to these long pectoral fins in adults.

Polydactylus sextarius is a small- to medium-sized threadfin which attains a maximum total length of but is more common. It has a pointed snout with the dorsal profile of the head being almost straight. There are two separate dorsal fins, the first with 8 similar spines and the second dorsal fin has a single spine and 12 or 13 soft rays. The anal fin has 3 spines and 11 to 13 soft rays, with the anal fin base being roughly the same length as the base of the second dorsal fin.

The Mediterranean scaldfish is a small flatfish with a slender oval body, a small head with large eyes placed on the left side of the head. It has an oblique mouth which is moderately sized. The dorsal fin has its origin in front of its upper eye, the first dozen or so dorsal fin rays are partially fee from the fin membrane, although they are not elongated. The pelvic fin on the eyed side has a long bas and is larger than its equivalent on its blind side.

The Pondicherry shark (Carcharhinus hemiodon) is an extremely rare species of requiem shark, in the family Carcharhinidae. A small and stocky gray shark, it grows not much longer than and has a fairly long, pointed snout. This species can be identified by the shape of its upper teeth, which are strongly serrated near the base and smooth-edged near the tip, and by its first dorsal fin, which is large with a long free rear tip. Furthermore, this shark has prominent black tips on its pectoral fins, second dorsal fin, and caudal fin lower lobe.

The spined pygmy shark (Squaliolus laticaudus) is a species of squaliform shark in the family Dalatiidae found widely in all oceans. Growing no larger than roughly , it is one of the smallest sharks alive, with this record beaten by the dwarf lanternshark. This shark has a slender, cigar-shaped body with a sizable conical snout, a long but low second dorsal fin, and an almost symmetrical caudal fin. Its sister species S. aliae and it are the only sharks with a spine on the first dorsal fin and not the second.

Ginglymostoma unami, also known as the Pacific nurse shark is a nurse sharks of the family Ginglymostomatidae. It is found in southeastern coast of Baja California, Mexico to Costa Rica including Gulf of California. This species differs from Ginglymostoma cirratum between posterior end of the second dorsal fin and the beginning of the caudal lobe, both being shorter; the new species also differs by the position of the insertion of the first dorsal fin with regard to the pelvic fins and in the form and number of keels on the dermal denticles and teeth morphology.

As they mature, the bands fade and become indistinct and the overall colour shifts to a silvery blue above and whitish below. In adults, the bars are completely absent and the dorsal colour is a silvery olive to blue green, fading to silvery white below. In juveniles, the fins are pale grey to yellow with darker edges, becoming darker overall in adulthood, with the anal and caudal fins yellow to black and the second dorsal fin olive to black. The tip of the second dorsal fin has a distinctive white tip.

Pseudanthias ventralis has males which are metallic purple with a yellow head and a yellow tinge on the back just below the dorsal fin, although sometimes this is masked by heavy purple spotting. The populations from the southern quadrant of their range normally has distinct and circular purple spots in this part of the back. The dorsal fin is red on the spiny part and hyaline or yellowish on the soft-rayed part. The caudal fin is mostly clear and the only markings are two vertical purple lines.

T. oligolepis has longer dorsal spines overall than those observed in the Kimberley region population. The third dorsal spine of T. oligolepis is distinctive and extends higher than the rest of the soft dorsal fin, whereas the fourth and fifth spines of T. kimberleyensis are longest. However, the spines of T. kimberleyensis do not extend beyond the height of the soft portion of the dorsal fin. T. oligolepis also has around 25 scales on its lateral line, compared to 30–31 typically (and up to 33) for T. kimberleyensis.

The pectoral fin is strongly falcate (scythe shaped), and extends beyond the origin of the second dorsal fin. The lateral line is strongly arched over a short length anteriorly, with the intersection of the curved and straight sections vertically below the fourth or fifth spine of the first dorsal fin. The curved section of the lateral line has 21 to 29 scales, while the straight section has 51 to 59 very large scutes. The breast is devoid of scales in a triangular patch to about one-third the distance to the pectoral fin base.

Cymolutes torquatus differs from Cymolutes praetextatus in having 12 instead of 13 rays in its dorsal fin and in the possession of dark brown markings on its head and body in not having a small black spot on the upper base of the caudal fin. It grows to a maximum of in standard length. The other meristic measurements for this species are that it has 9 spines in the dorsal fin as well as 9-12 soft rays while the anal fin has 2-3 spines and 9-12 soft rays.

The Seychelles gulper shark (Centrophorus seychellorum) is a species of fish in the family Centrophoridae found in Alphonse island in Seychelles. This species is distinguished by having large tip of snout to first dorsal distance of 34% TL; first dorsal fin high (7% TL); second dorsal fin base long (9.8% TL); long snout (12.2% TL); uniformly grey with tip and the trailing edge of dorsal fins blackish.Baranes, A. (2003): Sharks from the Amirantes Islands, Seychelles, with a description of two new species of squaloids from the deep sea. Israel Journal of Zoology, 49: 33-65.

A slim species generally not exceeding in length, the smalltail shark has a rather long, pointed snout, a broad, triangular first dorsal fin, and a second dorsal fin that originates over the midpoint of the anal fin base. It is plain gray in color, without prominent markings on its fins. The diet of the smalltail shark consists mainly of bony fishes such as croakers, while crustaceans, cephalopods, and smaller sharks and rays may also be consumed. It is viviparous, meaning the developing embryos are sustained by a placental connection.

The first dorsal fin is low with a minute leading spine; the second dorsal fin is twice as high as the first with a much larger spine. The caudal peduncle is short, leading to a long caudal fin with the upper lobe much larger than the lower. The dermal denticles of this shark are tiny and densely placed with no regular pattern; each denticle has a four-cornered base and rises to a narrow, slightly curved point. The denticles of females are firmly attached, while those of males are easily removed.

Exellia is a genus of extinct spadefish that lived in the Tethys Ocean during the early Paleogene. The adult form is shaped akin to a large spadefish or a short dolphinfish, with very large pelvic fins, and a long dorsal fin starting from in front of the eyes to near the base of the caudal peduncle. The juvenile form resembles a juvenile drumfish, with the dorsal fin forming a long crest on top of the head. The earlier species, E. proxima, is known from the Danata Formation Lagerstätten from the Late Paleocene of Turkmenistan.

Pseudanthis huchti is a very distinctively colour member of the genus Pseudanthias, as well as having the third dorsal fin spine and elongated caudal fin lobes. The males possess an obvious orange stripe which runs from their eye to the centre of their pectoral fin and a broad maroon band on the forward margin of the pelvic fin. The females and juveniles are greenish-yellow in colour. There are 10 s[pines in the dorsal fin and 17 soft rays while the anal fin contains 3 spines and 7 soft rays.

Mycteroperca rosacea has a body which is elongate, robust and compressed with its depth being the no greater at the origin of the dorsal fin as it is at the origin of the anal fin, in fact it is deepest at the origin of the anal fin. The standard length is 2.7 to 3.1 times the depth of the body. The preopercle has a small lobe its angle. The dorsal fin contains 11 spines and 16-18 soft rays while the anal fin contains 3 spines and 10-11 soft rays.

The arrow goby is a small, pale grey, translucent fish which grows to in length. It has two dorsal fins; the first is the shorter and has 4-5 spines while the dorsal fin has 15-17 soft fin rays. The anal fin is about equal in length to the second dorsal fin and has 14-17 fin rays. Like other gobies, the caudal fin is rounded and the pectoral fins form a cone which the goby uses to prop the anterior part of its body above the substrate.

Ernest Hemingway in Key West, Florida, USA, in the 1940s, with an Atlantic sailfish he had caught The Atlantic sailfish is a metallic blue fish with a large sail-like dorsal fin and a long and pointed bill-like snout. It is dark bluish-black on the upperparts and lighter on the sides (counter-shading), with about twenty bluish horizontal bars along the flanks; the underparts are silvery white. The tail fin is strongly forked. The fins are bluish-black and the front dorsal fin is speckled with small black spots.

There is a perceptible hump in the back beginning just behind the eye; it is topped by a conspicuous, crest-shaped spinous dorsal fin containing 7-10 spines which descend in height towards the posterior. In adults of some species, the dorsal spines are adorned with long, streamer-like filaments. A second, much lower dorsal fin (with 22-37 soft rays) extends down the rest of the back, in a slight retrorse direction due to the body's curvature. The caudal peduncle is thin and the caudal fin is small and truncate (brush- shaped).

Externally, these fish resemble members of the sisorid catfish genus Glyptothorax. Pseudolaguvia is diagnosed by the presence of a short thoracic adhesive apparatus with median depression; wide gill openings nearly meeting one another on the underside of the body; serrations on anterior margin of pectoral fin spine pointing toward tip; smooth to granulate anterior margin on the dorsal fin spine; slender body; papillate upper lip; and 8-10 anal fin rays. Both the dorsal fin and pectoral fin have strong spines. The head and body are slightly depressed.

Males display an olive-green coloration on the top half of the body near the dorsal fin, with gold sides and a silvery bottom. Sometimes, the males will have a dark spot on or near the rear dorsal fin, just above dark vertical stripes that line the gold sides. Female bayou killifish, however, are usually somewhat smaller than the males, and display dark spots all over their body—a characteristic unique to the females. Accompanying these spots are faint, often broken vertical stripes along the dorsum of the fish.

Heaviside's dolphins off Walvis Bay, Namibia Heaviside's are small and stocky with adults reaching a maximum length and weight of 1.8m and 75 kg respectively. The dolphin has a distinct black, grey and white body pattern, and is not easily confused with any other species in its range. The head and thorax are coloured light grey with darker patches around the eye. The dorsal fin, fluke and dorsal cape are a darker grey to bluish black colour with a band that extends from the dorsal fin to the blowhole.

The yellowfin grouper has a body which is elongate, robust and compressed, its depth being the no greater at the origin of the dorsal fin as it is at the origin of the anal fin, The standard length is 2.6 to 2.9 times the depth of the body. The preopercle is neatly rounded. sometimes having a small incision, and does not have a lobe at its angle. The dorsal fin contains 11 spines and 15-16 soft rays while the anal fin contains 3 spines and 10-12 soft rays.

The outer pair of mandibular barbels is about as long as the inner pair, have long, slender branches with secondary branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. filamentosus, the spine is as long as the head, curved, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays, ending in a long elongated filament that is longer than the dorsal fin itself.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have long branches. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. caudovittatus, the spine of the dorsal fin is slightly curved, long, about as long or a little shorter than the head, smooth or finely serrated in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The canary wrasse is a small fish that can reach a maximum length of 12 cm. It has a thin, elongate body with a terminal mouth. Body coloration is bright yellow with a few variations according to age. Juvenile and immature female have two black spots rimmed with white or light yellow on the dorsal fin (the first one at the start of the fin (head side) and the second in the middle of its dorsal fin) and a third one between the caudal peduncle and the start of the caudal fin.

Ocelli on dorsal fin and caudal peduncle A. ocellatus examples have been reported to grow to about in length and in weight. The wild-caught forms of the species are typically darkly coloured with yellow-ringed spots or ocelli on the caudal peduncle and on the dorsal fin. These ocelli have been suggested to function to limit fin-nipping by piranha (Serrasalmus spp.), which co-occur with A. ocellatus in its natural environment. The species is also able to rapidly alter its colouration, a trait which facilitates ritualised territorial and combat behaviours amongst conspecifics.

The dorsal fin contains 11 spines and 14-16 soft rays while the anal fin has 3 spines and 8 soft rays. The membranes between the spines in the dorsal fin are deeply incised. The caudal fin is rounded. The colour of the head and body is light-greyish brown with 5 dark brown vertical bars on the body and 1 on the nape, There may be a scattering of pale spots on the body and some there may also be indistinct small brown spots on the margins of the dark bars.

Synodontis longispinis is a species of upside-down catfish that is endemic to the Republic of the Congo where it is found in the Sangha River. It was first described by Jacques Pellegrin in 1930 as Synodontis batesi longspinis, a subspecies of S. batesi with an especially long dorsal fin spine, but it is presently recognized as its own species. The species name longispinis is derived from the word longus, meaning long, and the word spinis, meaning spine, which is a reference to the long dorsal fin spine on the fish.

The outer pair of mandibular barbels is about twice the length of the inner pair, and both pairs have moderately long, simple branches, with secondary branches on the inner pair. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. melanopterus, the spine of the dorsal fin is as long as or slightly shorter than the head, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

The stout whiting is similar in appearance to a number of Australian sillaginids, with dorsal fin and swimbladder morphology the best identification features. It is a small fish, reaching a known maximum length of 30 cm, but more commonly seen below 23 cm. Like most sillaginids, the stout whiting has a slightly more convex dorsal profile compared to the ventral profile, reflecting the benthic nature of the species. The dorsal fin is composed of 2 sections; the first consisting of 11 spines and the second of 1 spine followed by 16 to 18 soft rays.

Large specimens show a distinct anterior keel on the first spine of the first dorsal fin, with this feature being more pronounced in the eastern population. The anal fin is similar to the second dorsal fin, having 2 spines followed by 16 or 19 soft rays. The lateral line has 65-70 scales, whilst the cheek has 2 to 3 rows of cteniod scales, and there are 33 vertebrae in total. The swimbladders of the two populations are slightly different, with the eastern population having small anterolateral extensions, while the western population lack these.

The yellowtail trumpeter can grow to a maximum length of 28 cm, but it is usually around 15 cm. The body is deep in profile and is compressed laterally. The upper jaw is slightly longer than the lower. The first gill arch has 6 to 8 gill rakers on the upper limb and 12 or 13 on the lower. The dorsal fin has 12 or 13 spines and 8 to 10 soft rays; the spinous part of the dorsal fin is curved, with the fifth spine being the longest, and the final spine the shortest.

Clariid catfish are characterized by an elongated body, the presence of four barbels, long dorsal and anal fins, and especially by the autapomorphic presence of a suprabranchial organ, formed by tree-like structures from the second and fourth gill arches. This suprabranchial organ, or labyrinth organ, allows some species the capability of traveling short distances on land (walking catfish). The dorsal fin base is very long and is not preceded by a fin spine. The dorsal fin may or may not be continuous with the caudal fin, which is rounded.

Amblyceps carinatum is a species of catfish belonging to the family Amblycipitidae. It is only known from the upper part of the Irrawaddy River basin in Myanmar. This is a small catfish (up to 36 mm standard length) found in fast flowing streams. The main characteristic which distinguishes it from its congeners is the shape of the adipose fin: in A. carinatum it takes the form of a long low ridge starting just behind the dorsal fin whilst in all other Amblyceps species it is blade-shaped and starts well behind the dorsal fin.

The dorsal profile rises evenly but not steeply from tip of snout to the origin of the dorsal fin, then slopes gently ventrally from there to end of caudal peduncle. The ventral profile is horizontal to origin of the anal fin, then slopes dorsally to end of the caudal peduncle. The head is covered with small tubercles with poorly demarcated and indistinct margins, and the body with such tubercles arranged in 5-6 longitudinal rows on each side. The dorsal fin origin is nearer the tip of the snout than caudal flexure.

The dorsal fin has twelve spines and eighteen soft rays, the anal fin has two spines and nineteen or twenty soft rays and the tail fin is rounded. The color is somewhat variable, being some shade of gold, green, tan or rust, blotched at regular intervals with dark brown mottling. The top of the head is bronze and there is a dark stripe starting above the eye, broadening above the pectoral fin and gradually becoming fainter towards the caudal peduncle. Some individuals have a blue spot near the front of the dorsal fin.

Two other distinct features of the plains topminnow are its rounded caudal fin and the absence of an externally visible lateral line. The plains topminnow has 33 to 37 ctenoid scales in its lateral line. The dorsal fin has 9-12 rays, the anal fin 12-15 rays and the origin of the anal fin is slightly forward of the dorsal fin, the pelvic fin is small and in the abdominal position. The plains topminnow also has a squared caudal fin, a trait that many topminnows and killifish share.

The Venezuelan grouper has a body depth which is less than the length of the head. the depth of the body being around one third of the standard length, the body is elongate and robust, and is no deeper at the origin of the dorsal fin than it is at the origin of the anal fin. The dorsal fin contains 11 spines and 15-17 soft rays and the anal fin contains 3 spines and 10-12 soft rays. The preopercleis serrated and has a distinct lobe at its angle which has enlarged serrations.

The mouth is nearly straight, with three lobes on the lower lip and furrows at the corners. There are 28-33 tooth rows in the upper jaw and 22-32 tooth rows in the lower jaw; each tooth has a large central cusp flanked by two smaller ones. There are five distinctive ridges running along the body in adults, one along the dorsal midline and two on the sides. The dorsal midline ridge merges into the first dorsal fin, placed about halfway along the body and twice the size of the second dorsal fin.

Both the upper and lower jaws have a pair of large canine teeth at the front and there are also 1 to 3 large canines in the middle of the lower jaw There are teeth on the roof of the mouth. The dorsal fin contains 9 spines and 13 to 15 soft rays and it has its origin above the posterior end of the gill cover. The mambranes between the spines of the dorsal fin are not or are only slightly incised. The anal fin has 3 separated spines and 8 soft rays.

Mycteropreca insterstitialis has an elongate, robust and compressed body which is no deeper at the origin of the dorsal fin than it as the origin of the anal fin. It standard length is 3.0 to 3.4 times its depth. The preopercle is angular and has an obvious lobe at its angle, this lobe has enlarged serrations, there is a clear incision in the preopercle above this lobe. The dorsal fin contains 11 spines and 16-18 soft rays while the anal fin contains 3 spines and 10-12 soft rays.

The spawned eggs of the Iowa darter average around a 1.1 mm in diameter. Their developmental time is around 18–26 days at 13-16 °C and the newly hatched darters are around 3.4 mm in standard length. The hatching size is around 3.6 mm total length, and most major structural features, including the pectoral fin, first dorsal fin, second dorsal fin, and the branchiostegal rays, were formed when the larvae were between 7.7 and 9.1 mm. Much of the lateral line sensory system was formed when the larvae reached about 20 mm.

The first one starts the anterior ventral area, passes between the eyes and the pectoral fin's shoulder and ends with the first rays of the dorsal fin. The head is black to chocolate and this dark area includes the mouth, the eyes, the little horn between the eyes and the frontal growth. The space between the horn and the growth gives the impression that the profile of its forehead is concave. The second white band begins from the base of caudal peduncle and move towards the center of the dorsal fin.

The outer pair of mandibular barbels is a little under twice the length of the inner pair; and the outer pair with moderately long branches and the inner pair with secondary branches present. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. robbianus, the spine of the dorsal fin is about to times the length of the head, slightly curved, smooth in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

When compared to other Cambrian chordates like the possible cephalochordate Cathaymyrus and the two known vertebrates Haikouicthys and Myllokunmingia, Zhongxiniscus resembles Cathaymyrus in having S-shaped myomeres, but is different in having a dorsal fin and a shorter body. Zhongxiniscus approaches in form to Haikouicthys and Myllokunmingia in its myomeres and its dorsal fin, but differs from the latter two having zigzag myomeres and fin rays, which Zhongxiniscus evidently lacks. For these reasons, Zhongxiniscus is tentatively considered to be an intermediate form between Cathaymyrus and the two vertebrates Haikouichthys and Myllokunmingia.

Fish of this species are usually deep-bodied, flattened sideways, and somewhat circular or rounded, with blunt noses and small mouths with weak teeth. Some other characteristics of this fish are the absence of ventral fins, one long, continuous dorsal fin, long pectoral fins, and tiny, cycloid scales. The tail fin is nearly as long as the dorsal fin and deeply forked. The American butterfish is similar in appearance to its close relative, the harvestfish (Peprilus alepidotus), but can be distinguished by its much lower dorsal and tail fin.

The caudal fin rounded. The overall colour of this species is reddish-orange and it has seven wide, lemon-yellow bars on the upper flanks which reach onto the dorsal fin, and three wide yellow irregular oblique stripes on the head. The juveniles are yellower, darkening on the lower body, and they have several white bars on the body and a large black eyespot on the soft rayed part of the dorsal fin. They also have blackish pelvic fins, and a black area at the base of the anal fin.

The background body coloration of the dorsal side is deep blue-mauve with a large black band stretches from eye to eye. The ventral side is white. The inner surface of the cephalic fins are silver-grey with black tips, while the outer surface and side behind eye are white. The species can be distinguished from other large rays by its projecting head, a white-tipped dorsal fin, a spine between the base of the dorsal fin and the start of the tail, and the length of its tail.

The simple lateral line has 60 to 67 pored scalesand runs from the upper end of the gill slit to the upper end of the lower lobe of the caudal fin. The head and flanks are tinged silvery brown dorsally, becoming silvery on their lower flanks. There are 7 to 9 prominent dark longitudinal stripes above the lateral line and 1 to 12 faint stripes below it, these may be absent in smaller fish. The first dorsal fin is black; the second dorsal fin is greyish with the last ray being white.

Both jaws are lined with villiform teeth, although larger specimens have small conical teeth in bands. The gill rakers are one of the diagnostic features of the species, having 30 to 37 rakers on the first arch. The dorsal fin is in two parts, the first consisting of 13 spines and the second of 1 spine followed by 19 to 22 soft rays. The second dorsal fin is sexually dimorphic, with mature males longer than 21 cm having 3 to 12 of the central soft rays extended into thin filaments of varying lengths.

The first dorsal fin has a single spine and 7 to 10 fin rays; the second dorsal fin has 36 to 40 fin rays and the anal fin has 36 to 40 fin rays. The tips of the pectoral fins extend to the level of the origin of the abnal fin in young fish which are less than in standard length but does not do so in adults. The caudal fin is well-developed and has a truncate margin. The lateral line is straight and darker than the background colour.

Pempheris vanicolensis has a compressed body which is deepest at the origin of the dorsal fin, before it tapers markedly towards the tail, mainly on the ventral side, with a narrow caudal peduncle. It normally has a greenish sheen over the back and most of the head. The anal fin shows an obvious black margin, the tip of the dorsal fin is black, and the pectoral fins are yellow lacking any black markings. The body depth is 2.2-2.4 times the standard length and it grows to up to 20 cm in total length.

It can be distinguished from other large requiem sharks by its relatively small first dorsal fin with a curving rear margin, its tiny second dorsal fin with a long free rear tip, and its long, sickle-shaped pectoral fins. It is a deep, metallic bronze-gray above and white below. With prey often scarce in its oceanic environment, the silky shark is a swift, inquisitive, and persistent hunter. It feeds mainly on bony fishes and cephalopods, and has been known to drive them into compacted schools before launching open-mouthed, slashing attacks.

The first dorsal fin is relatively small, measuring less than a tenth as high as the shark is long, and originates behind the free rear tips of the pectoral fins. It has a rounded apex, an "S"-shaped rear margin, and a free rear tip about half as long as the fin is tall. The second dorsal fin is tiny, smaller than the anal fin, with a drawn-out free rear tip up to three times as long as the fin is tall. A narrow dorsal ridge runs between the dorsal fins.

Cynoglossus sinusarabici, the Red Sea tonguesole, is a species of tonguefish which occurs in the Red Sea and which has invaded the Mediterranean Sea through the Suez Canal as a Lessepsian migrant. It has an elongated body with a rounded snout which has a rostral hook large, narrowly separated eyes. It has 99-101 dorsal fin rays, 78-79 rays in its anal fin and 8 rays in the caudal fin. The lateral line has 54-60 scales with 11 scales between the lateral line and the base of the dorsal fin.

The Panama hake is a relatively small species which does not normally grow to a greater length than 30 cm, although specimens have been described up to 40 cm. It has a relatively long head and long pectoral fins which reach at least to the origin of the anal fin. The anterior dorsal fin has a single spine and 9-12 fin rays, while the posterior dorsal fin has 36-40 rays. The caudal fin can be truncate or emarginated and it has 121-134 scales along the lateral line.

The anterior portion of an opah's single dorsal fin (with about 50–55 rays) is greatly elongated, also in a falcated profile similar to the pelvic fins. The anal fin (around 34 to 41 rays) is about as high and as long as the shorter portion of the dorsal fin, and both fins have corresponding grooves into which they can be depressed. The snout is pointed and the mouth small, toothless, and terminal. The lateral line forms a high arch over the pectoral fins before sweeping down to the caudal peduncle.

It can be distinguished from all its congeners by the anatomy of the dorsal fin: eight branched rays are present instead of seven and there is a membrane connecting the last ray to the back of the fish.

Of all the Atlantic Oxynotus species, O. paradoxus is the only species to have an incline first dorsal fin spine. The color of the shark when living is uniform dark brown, but it turns black in preserved specimens.

Its lateral line ends blow the origin of the second dorsal fin. Its pelvic fins sit almost right below the pectoral fins in the thoracic region. The species does not have scales.Bigelow, H. B., & Schroeder, W. C. (1953).

This fish can be distinguished from the greater sand eel by its smaller size (less than ) and the fact that the origin of the long dorsal fin starts approximately in line with the tip of the pectoral fin.

The pelvic fins and pelvic bone are absent in both sexes; the present fins are small and rounded. The dorsal fin and anal fin are of roughly equal size, both positioned far back from the head, and retrorse.

Its dorsal fin is set further back compared to most fish.Woods, L.P., and R.F. Inger. 1957. The Cave, Spring, and Swamp Fishes of the Family Amblyopsidae of Central and Eastern United States. American Midland Naturalist 58:232-256.

Smallscale archerfish have a pointed snout and large eyes. The back is flat and the belly is curved. There is only one dorsal fin, with four to five dorsal spines. The fourth spine is longer than the third.

The orphan Gush X’een (translation: Dorsal Fin Screen, English: Gushklin) lived at Ch’aal’in. He was a Teikweidí named Joonák’w. The leader of the Naanya.aayí, S.nóok, took a liking to the orphaned boy and raised him as a nephew.

The lowfin gulper shark has no anal fin, two dorsal fins (with spines with the first dorsal fin being much longer than the rear), a long, broad snout, and angular pectoral fins. Its maximum length is 1.6 m.

Also, this species lacks long cheek odontodes and the adipose fin. P. obscurum, unlike P. wertheimeri, simultaneously lacks an adipose fin and cheek odontodes. Its dorsal fin base is also longer than of other members of this genus.

These may fade as the fish matures. The long, narrow dorsal fin has 9 spines and 12 soft rays. The anal fin has three spines and 11 or 12 soft rays.Biocellate Wrasse, Halichoeres biocellatus (Schultz, 1960) Australian Museum.

The fish in this genus have a long and hook-shaped dorsal fin. They have a silver body and a white to orange pelvic fin. They have a complete lateral line, and have a two-chambered gas chamber.

Eucinostomus argenteus, the spotfin mojarra or silver mojarra, is a species of fish belonging to the family Gerreidae. The name spotfin mojarra is descriptive of the black spot that appears on the anterior part of the dorsal fin.

Amatitlania septemfasciata grows to between . Males are typically larger than females. Both sexes generally have six vertical bars along each side. Females have a black spot or ocellus on the dorsal fin, which is generally surrounded by metallic coloration.

Its dorsal side is yellow and is separated from its white ventral side by a black band. It has three red lines across the top of its head, and it may have a dark spot on its dorsal fin.

Along the lateral line there is a row of large, plate-like scales. The divided dorsal fin has nine spines and seventeen to eighteen soft rays while the anal fin has no spines and sixteen to eighteen soft rays.

McGrouther, M. (November 2004) Pineapplefish, Cleidopus gloriamaris. Australiam Museum Fish Site. Retrieved on March 13, 2009. The first dorsal fin consists of 5-7 strong spines; the spines are free of a membrane and point alternatingly left and right.

The generic name Notoclinops refers to the superficial resemblance of the species in Notoclinops to the distantly related genus Notoclinus the two sharing a head lacking in scales, a broken lateral line and four spines in first dorsal fin.

The snout is rounded or roughly triangular in dorsal view. The mouth is slightly inferior (pointed downwards). The dorsal fin and pectoral fins have one spine. The pectoral fin spine has stronger odontodes anteriorly and small retrorse hooks posteriorly.

Another harness-shaped band goes around the back, continuing to the pectoral fins and sides. Thin, dark stripes are also present on the backs of Port Jackson sharks. These progress from the caudal fin to the first dorsal fin.

The sailfin flying fish is stocky as far as flying fish are concerned. It has comparatively small pectoral fins and a long dorsal fin relative to other flying fish. One distinguishing feature is its blunt snout. It displays countershading.

The dorsal fin is preceded by a spine. The adipose fin is present and can have a relatively long base in some species. The pectoral fin spine can be serrated. The body is completely naked (they have no scales).

The front dorsal fin has a narrow dusky green border and a broad red marginal stripe in males and a narrow red stripe in females. The caudal peduncle has a row of three or four, somewhat irregular, dark spots.

Page, Lawrence M. and Burr, Brooks. Peterson Field Guide to Freshwater Fishes of North America North of Mexico. Boston: Houghton Mifflin Harcourt, 2011, p. 104. The last dorsal fin ray extends beyond the first ray of the depressed fin.

Despite this, the fish is photophobic, actively avoiding light. Its maximum total length is . Minor differences have been described between the different cave populations; some have a spot on the opercular and one has a serrated dorsal fin spine.

The dorsal fin has 11 spines, followed by 12 rays. The anal fin has 3 spines and 11 rays. There are 16 to 19 gill rakers on the first gill arch. The lateral line has 77 to 78 scales.

Macroudidae is a family of deep sea fish, a diverse and ecologically important group, which are part of the order of cod-like fish, the Gadiformes. The species in the Macrouridae are characterised by their large heads which normally have a single barbel on the chin, projecting snouts, and slender bodies that taper to whip-like tails, without an obvious caudal fin but what there is of the caudal fin is often confluent with the posterior dorsal and anal fins. There are normally two dorsal fins, the anterior dorsal fin is quite high, the posterior quite low but is longer and takes up a greater proportion of the fish's of the back, species in the subfamily Macrouroidinae have a single dorsal fin. The long anal fin is almost as long as the second dorsal fin is nearly as long as the posterior dorsal, and sometimes it is longer.

The two species of Eurycheilichthys are similar. The trunk and caudal peduncle are round in cross section. Males have a fleshy flap along the posterior margin of the thickened first pelvic fin ray. They lack a dorsal fin locking mechanism.

The pelvic fin is sexually dimorphic. It is an uncommon species related to pipefishes and seahorses. It can be distinguished by the presence of the pelvic fins, the prominent spiny dorsal fin, and 27–35 star-shaped plates on the skin.

The origin of the pelvic fins, which have seven (occasionally eight) soft rays, are immediately below or in front of the origin of the dorsal fin. This fish has a bluish or greenish back and silvery flanks, with no dark spotting.

The gill-flap on the cheek (preopercle) each has five sharp spines. It has a first dorsal and a second dorsal fin that are separated by a gap. The pectoral fins are particularly large. The fish lacks an air-bladder.

The genus Caprodon can be distinguished from Odontanthias and other Anthiinae with teeth on the tongue, by the asymmetrical pectoral fins, the truncate caudal fin, the presence of a scaly dorsal sheath, and by the many-rayed soft dorsal fin.

The dorsal fin is relatively small, at and about two thirds of the way back on their bodies. It is falcate (sickle-shaped) and usually pointed. The back is mid-to-dark grey with a lighter underside. They weigh approximately .

The species P. tiantian – with a range close to P. didi – is similarly marked, but P. didi can be distinguished by its truncated lateral line, deeper body and longer dorsal fin, with two rows of dark markings rather than one.

The Dixie chub was described by the American ichthyologist David Starr Jordan in 1877. The generic name Semotilus means "spotted banner" and refers to the dorsal fin while the specific name thoreauianus was given to honor of Henry David Thoreau.

It has two long barbels for locating food, which are as long again as the body in front of the anal fin. The dorsal fin is reduced to a tiny triangle, and the pectoral fins are longer than the head.

Mesoclupea showchangensis is an extinct ichthyodectiform ray-finned fish that lived in freshwater environments in what is now China during the Early Cretaceous epoch. It differs from its sister genus, Chuhsiungichthys, primarily by having a more posteriorly-placed dorsal fin.

The wallago species are large, predatory catfishes. They have five rays in their dorsal fin. The caudal fin is deeply forked and has pointed lobes; it is disconnected from the anal fin, which differs from some of the other silurid genera.

This fish is distinguished from others of its type due to its suborbital groove, pelvic fin, large dorsal fin, irregular light and dark spots, and thin dorsal saddles. It is found in a freshwater environment, demersal zone, and tropical range.

Their skeletal anatomy allows them to be fast swimmers. They have a very well defined and triangular dorsal fin, allowing them to steer better in the water. Unlike their dolphin counterparts, they are adapted for coastal shores, bays, and estuaries.

The dorsal fin has a yellow margin and there is a bright orange patch above the caudal peduncle. It is found in seaward and lagoon reefs, sometimes together with the spot-banded butterflyfish. It feeds on polychaetes, coral polyps, and algae.

The membranes between the dorsal fin spines are obviously incised. The caudal fin is rounded. There are 58-65 scales in the lateral line. The head and body are light brown on the back lightening to whitish on the underparts.

Ictalurid species have four pairs of barbels (commonly referred to as "whiskers" as applied to catfish). Their skin does not have any scales. The dorsal and pectoral fins usually possess a spine. The dorsal fin usually has six soft rays.

The base of the dorsal fin is highlighted by a bright yellow line. Then superimposed over this later yellow line a blue line, a yellow one, green one and finally a fin pinkish one. The iris of the eye is orange.

The bones supporting the first and second caudal fin rays are fused. In addition, principal caudal fin-rays show sixteen rows of free neuromasts. The posterior orbits have more than three flute canals. The first dorsal fin shows 8 visible spines.

Carcharias are 2.5m long on average. The maximum weight of the shark is 158.8 kg. Differentiating species of sharks is usually done by locating and measuring their fins. The second dorsal fin and the anal fin of Carcharias are very large.

The juveniles are red wth a large black eye spot in the centre of the last few spines in the dorsal fin and a small black spot on the top of the caudal peduncle. It can grow to in total length.

They also have darker bands on the sides. In contrast, the males have pale gray bands that are close together. The numbers of bands on the dorsal fin of a banded killifish is useful in determining the sex of this species.

The clown knifefish grows to a fairly large size, up to and in the wild. It has two nasal tentacles above its large, toothed mouth. In the center of the body is a flaglike dorsal fin and has no ventral fins.

Their dorsal fin is triangular, but their second dorsal and anal fins are long, continuous, and do not attach to the tail fin, much like an eel. The head is small, but has a large mouth with many small teeth.

Sexual dimorphism is exhibited in most species in that mature females are typically larger than males; this is, however, reversed in Hoplomyzon sexpapilostoma. Also, in Aspredo and Platystacus the dorsal fin spine is much longer in males than in females.

The lateral line curves slightly above the pectoral fin. The dorsal fin reaches the eye. The dorsal and anal fins are distant from the caudal fin. The anal fin contains 48 to 59 soft rays and is preceded by a spine.

These colorful large catfishes have a brownish back, with yellow sides and characteristic orange- red dorsal fin and caudal fin (hence the common name). It has a pair of barbels on the upper jaw and two pairs on the lower jaw.

Accordingly, a large external ventral fuel tank was adopted, along with an extended dorsal fin and folding wing tips. Flight testing was largely conducted at Supermarine's newly created experimental establishment at the former RAF Chilbolton.Flight, 15 May 1947, pp. 446, h.

It grows to a length of 2.8 m. The largest Amazon Piraíba records 2 – 2.5 m weighing more than 150 kg. Dorsum dark to light grey with small dark spots on caudal- fin or peduncle. Dorsal fin with pink shading.

Opisthonema is a genus of herrings, the thread herrings, found in tropical waters of the Western Hemisphere. They get their name from a filamentous nature of the last ray of the dorsal fin. Currently, five species are in this genus.

Juveniles are orange or yellow with a black spot around their dorsal fin. Around that black spot, it has a blue circle around it. There is usually a blue pattern of lines that extends from its eye towards the black spot.

Warming's lantern fish grows to a length of about . The rounded dorsal fin has 13 to 15 soft rays and the anal fin has a similar number of soft rays. The body has patches and scale-like specks of bioluminescent material.

The dorsal and anal fins are colorless. Their second dorsal, anal and caudal fins rounded. In males, 1-3 soft dorsal fin rays extended as filaments; the first ray has a particularly long thread. The fish have a small abdominal spike.

Similarly, the molid may break the surface of the water with its dorsal fin and beak to attract the attention of a gull or similar seabird. The seabird will then dig worms and other stubborn parasites out of the molid's skin.

Body is oblong, robust, and slightly compressed, with one continuous dorsal fin. The caudal fin is slightly forked. It has a distinctive body shape, and is easily recognised. The forehead is steep, and adults have a prominent hump on the nape.

Kronichthys species are small, cylindrical fishes similar to the hypoptopomatine Schizolecis. The color pattern is dark brown with a slight mottling or four dorsal saddles, and the abdomen mostly white. The dorsal fin is short and the adipose fin is small.

They have no spinous dorsal fin, absent or reduced scales, sandpapery denticles on various areas of the body, and a reduced gill opening. Identification of species is determined in part through color, pattern, and the presence and number of spines and fleshy tabs, or lappets, on the skin (Robins & Ray 1986). The checkered puffer is pale tan to yellowish with a polygonal or square network of lines centered on a bulls-eye pattern on the midback in front of the dorsal fin. Lines are dark gray to olive, with small, dark brown spots on cheeks and lower sides.

Counts: 10+ dorsal fin rays; 8-13 scale rows from pelvic origin to isthmus; 30 or fewer longitudinal scale rows (Hubbs et al. 1991); 27 (26-28) lateral scales; 11 (9-13) dorsal fin rays; 13 (12-14) pectoral fin rays; 6 (4-7) pelvic fin rays; 9 (8-13) anal fin rays; 16 (15- 18) caudal fin rays; 8 (5-9) gill rakers on 1st arch (Sublette et al. 1990). Body shape: Body deep, rather compressed; head flattened above, tapering to vertically rounded, blunt snout (Hardy 1978). Body depth contained four times in standard length (Hubbs et al. 1991).

The fin anatomy is highly useful for identification purposes, with the species having 10 to 12 spines in the first dorsal fin, with one spine and 18 or 19 soft rays on the second dorsal fin. The anal fin has two spines with 18 to 20 soft rays posterior to the spines. Lateral line scales and cheek scales are also distinctive, with southern school whiting possessing 63 to 70 lateral line scales and cheek scales positioned in 3-4 rows, all of which are ctenoid. The amount of vertebrae are also diagnostic, having 33 to 35 in total.

There are no teeth on the roof of the mouth. The dorsal fin has 11 o 12 spines and 9 to 11 soft rays, the spiny part is notably arched and has a deep notch. The third to the sixth dorsal fin spines are the longest and the notch is created by the second last spine being around half the length of the last spine. The anal fin has three spines and 7-9 soft rays, the longest spine being the third and this is longer than the longest ray, The caudal fin has a shallow fork and rounded lobes.

Polydactylus plebeius is a medium-sized threadfin which attains a maximum total length of but is more commonly . It has a pointed snout and the dorsal profile of the head is nearly straight. There are two separate dorsal fins, the first containing 8 spines which all have a base of similar thickness and the second dorsal fin has a single spine and 12 or 13 soft rays. The anal fin has 3 spines and 11 or 12 soft rays and has a base with is roughly equal in length to that of the second dorsal fin.

They also assert that swordfish "use sensitive rostrum/lateral-line sensors to detect upcoming/ambient water pressure and attain the best attack angle to capture the body lift power aided by the forward-biased dorsal fin to compensate for most of the water resistance power." Billfish have prominent dorsal fins. Like tuna, mackerel and other scombroids, billfish streamline themselves by retracting their dorsal fins into a groove in their body when they swim. The shape, size, position and colour of the dorsal fin varies with the type of billfish, and can be a simple way to identify a billfish species.

The Coosa darter is a robust species of darter which can be identified by having a blunt snout with a small mouth. The spiny part of its dorsal fin is marked with bands of color and has a central red band along the whole of its length, although it does not posses the anterior ocellus found in many other species in the subgenus Ulocentra. Above and below this central band there are alternating clear and dark bans. In the soft-rayed part of the dorsal fin, the middle part of the membranes between each ray is red.

Melon-headed whales have a robust, dolphin-like body, a tapering, conical head (head shape triangular when viewed from above) with no discernible beak and a relatively tall, falcate (sickle-shaped) dorsal fin located near the middle of the back. Body coloration is charcoal-gray to dark-gray body. A dark face ‘mask’ extends from around the eye to the front of the melon and larger animals have whitish lips. Melon-headed whales have a dark colored dorsal cape that starts narrowly at the front of the head and dips down at a steep angle below the dorsal fin.

The moderately tall first dorsal fin is placed about halfway between the pectoral and pelvic fins, and its trailing margin is nearly vertical near the apex. The second dorsal fin is about three-quarters as high as the first and larger than the anal fin. The caudal fin has a well-developed lower lobe and a prominent ventral notch near the tip of the upper lobe; in young sharks the lower caudal fin lobe is much less distinct. This species is gray above, with darker saddles and scattered black spots that fade with age; the underside is off-white.

The eastern school whiting has a pale sandy colour on top with a silvery white below and an olive brown-pink head with blue and yellow tinges. A series of obliquely positioned rusty brown bars are positioned on the back and upper sides, with a longitudinal row of rusty brown blotches along the mid-lateral silver stripe. There is no dark spot at the base of the hyaline-yellow pectoral fin. The first, spinous dorsal fin is hyaline with a dusting of red spots, while the second dorsal fin is hyaline and each ray having a sprinkling of 4-5 red spots.

Cephalopholis taeniops has a basic colour of reddish orange with the head and body covered with small blue spots as are the dorsal fin, anal fin and caudal fin. The fins are blackish towards the margins while the soft-rayed part of the dorsal and anal fins and the caudal fin have a narrow bluish margin, There is a horizontal blue line immediately below eye. There is a much rarer black variety which also has blue spots. There are 9 spines and 15-16 soft rays in the dorsal fin while the anal fin has 3 spies and 9-10 soft rays.

The pelvic, anal and caudal fins have bluish-black margins. When resting they often assume a camouflage pattern with 5 dark brown saddles separated by white bars along the base of the dorsal fin. The large adult males are typically pale to medium grey in colour, with an indistinct reticulated pattern underneath the dorsal fin. They are darker grey or black on the breast and belly, with a similar colour on the margins of the soft rayed part of the dorsal find the caudal fin, as well as the posterior margins of the pectoral and pelvic fins.

This motion causes the dorsal fin to resemble a small fish gyrating in the water. The fish-like shape of the fin is emphasized by the more subtle movement between the first and second dorsal spines, which continually move closer and then further apart, mimicking the opening and closing of a fish's mouth. Another factor to this behavior is the active color-changing between the fin and body, as during luring, the normally deep red dorsal fin becomes much more intense in color, and the body of the fish conversely becomes more dull as a camouflage mechanism.

With predominantly drab colours in shades of orange and olive, greatly elongated bodies and large rounded heads, ronquils could easily be mistaken for blennies. Their eyes and terminal mouths are large, with a single long, continuous dorsal fin which begins just behind the head; the anal fin is similarly extensive, and both it and the dorsal fin may either have one or two spines, or none at all. The pectoral fins are also quite large, and like the much smaller tail fin, rounded. The reduced pelvic fins are located in a thoracic position, just behind the throat.

The pelvic fins are about as large as the second dorsal fin, with rounded tips and nearly straight trailing margins. The caudal peduncle is short and leads to a broad caudal fin comprising less than a quarter of the total length; the upper lobe has a convex upper margin leading to a squared-off tip, while the lower lobe is indistinct. The skin is densely covered by tiny dermal denticles; each one is recurved and thorn-like, rising from an irregular star-shaped base. This species is a plain dark brown above, darkening to almost black below, with white dorsal fin spines.

The blacktip reef shark (Carcharhinus melanopterus) is a species of requiem shark, in the family Carcharhinidae, which can be easily identified by the prominent black tips on its fins (especially on the first dorsal fin and its caudal fin). Among the most abundant sharks inhabiting the tropical coral reefs of the Indian and Pacific Oceans, this species prefers shallow, inshore waters. Its exposed first dorsal fin is a common sight in the region. The blacktip reef shark is usually found over reef ledges and sandy flats, though it has also been known to enter brackish and freshwater environments.

The outer pair of mandibular barbels is two to three times the length of the inner pair; and the outer pair with moderately long, slender branches and the inner pair with secondary branches present. The front edges of the dorsal fins and the pectoral fins of Syntontis species are hardened into stiff spines. In S. depauwi, the spine of the dorsal fin is about times the length of the head, nearly straight, sharp-edged in the front and serrated on the back. The remaining portion of the dorsal fin is made up of seven branching rays.

Galaxias arcanus has the typical Galaxias body form, with a long tubular body and a maximum recorded standard length (SL) of , typically . Fins have slightly fleshy bases, although less so in the paired fins, and are thin, moderately long and are generally paddle shaped. The pelvic fins are inserted about midway along the SL, with the dorsal fin somewhat further back with the anal fin starting about even with or slightly before the rear end of the base of the dorsal fin. The caudal (tail) fin is moderately lobed and somewhat shorter than the caudal peduncle.

The second dorsal fin also bears a spine in front and is over twice as large as the first in area, with the span between it and the first dorsal fin approximately equal to the distance between the snout tip and first gill slit. The anal fin is absent. The caudal fin is low and narrow, with an indistinct lower lobe and an upper lobe about as long as the head. The dermal denticles on the sides of the body are stout and thorn-shaped, widely spaced without any regular pattern; the snout is mostly covered by denticles.

It is a stocky fish with a large rounded head. Its body is long and cylindrical in shape and is covered in large greenish-brown scales which are edged with narrow bands of black across the back, paling to golden on the flanks and even paler on the belly. The tail is dark brown or black, the dorsal fin is a greyish-green in colour and all the other fins being are orange-red. The dorsal fin has 3 spines and 7-9 soft rays while the anal fin has 3 spines and 7-10 rays.

The Chihuahua shiner has a stout, barely compressed body which is deepest under its nape with the mouth being horizontal and situated under the rather rounded snout. It has a complete lateral line; There are normally less than 10 rays in the dorsal fin and the longest ray is twice the length of the last ray and the first ray is a tiny-splinter like ray which is closely attached to the second ray, which is a well developed unbranched ray. The origin of the dorsal fin is directly over that of the pelvic fin. The anal fin has 7 soft rays.

The dark stripes can fade under certain circumstances, such as dominance displays and courtship, and at times vertical bands can appear on the body, particularly while caring for fry. Males have more pointed fins and females have a metallic band on their dorsal fin. Males have a red and white margins on the top of the dorsal fin and on the top rear edge of the caudal fin, and the anal fin is red with many blue dots. The female has a red or purple belly, which becomes brighter and edged in iridescent white or blue during courtship.

This light grey patch found on the throat of pilot whales forms the shape of an anchor. Some individuals have other distinct markings such as a light coloured area behind dorsal fin, known as a saddle patch, as well as an upwards sweeping stripe just behind the eye. The dorsal fin is thick and falcate in nature, and is located about a third of the way down the length of the animal. The common name of this species is a reference to the pilot whale's long, sickle-shaped pectoral flippers that are 18 to 27 percent of its total body length.

Anisochromis is a genus of ray-finned fish, it is the only genus in the monotypic subfamily Anisochrominae, part of the dottyback family Pseudochromidae. They are distinguished from other subfamilies of the Pseudochromidae by having a single spine and four soft rays, three of which are branched and one is simple, in the pelvic fins and the pelvic fins are obviously placed to the front of the base of the pectoral fin. The pectoral fins have 13-15 rays and there is a single lateral line which runs along the base of the dorsal fin, the dorsal fin having one weak spine.

Juveniles are dark brown and are marked with obvious white spots arranged in vertical rows on rear part of the of head and on the body. These extend onto the dorsal fin and like adults they have a black margin to the spiny part of the dorsal fin while the caudal and pectoral fins are yellow to clear. The upper part of the base of the caudal fin has a deep black saddle-like mark that extends underneath the lateral line. This species attains a maximum published total length of , although are more commonly around , and a maximum published weight of .

The marbled grouper has a body which is at least twice as deep as its standard length which is at its deepest at the origin of the dorsal fin and laterally compressed. It has a long snout and the dorsal profile of the head is steep. The dorsal fin has 11 spines and 18-20 soft rays while the anal fin has 3 spines and 8-9 soft rays, the pectoral fin is large. The adults are yellowish brown marked with numerous small dark brown spots on the head, body and fins and pale blotches on the head and body.

The common percarina is distinguished from its congener P. maeotica by having no scales on its cheek, by having nearly transparent membranes on the body and fins, the upper body is milky white in colour with no spots. It also has 8-9 round or irregular markings on the base of both dorsal fins. The dorsal fins are clearly separate in both species of Percarina and in this species the first dorsal fin contains 9-10 spines while the second dorsal fin contains 3 spines and 10-12 soft rays. The anal fin has 2 spines and 8-11 soft rays.

The longnose darter is mostly yellow with a stripe of dark blotches down the lateral line. It has a bright yellow stripe on a mostly translucent first dorsal fin, and a block spot at the center of the base of the caudal fin. The rays of the second dorsal fin and the caudal fin are black and yellow striped like the color pattern along the lateral line. This fish can be characterized by a long, pointed snout that can be darker colored than the rest of its body and has been recorded to reach lengths of up to 11 cm.

The overall colour is brownish to greenish-grey and there are normally 7–8 dark vertical bars on the flanks. The dorsal fin has a wide dark submarginal band and a thin white margin, these are also present on the anal fins, and the upper and lower lobes of the caudal fin. There is a blackish spot on the upper margin of the gill cover. The juveniles have a yellowish on the posterior portion of their body and are marked with a white stripe which runs from the snout to the origin of the dorsal fin.

The lobe of the second dorsal fin is elongated, being greater than the head length. The anal fin is composed of two anteriorly detached spines followed by a single spine and 15 to 17 soft rays. The lateral line has a moderate arch anteriorly, with the junction of the curved and straight sections below the tenth or twelfth soft rays of the second dorsal fin. The curved section of the lateral line is slightly longer than the straight section, and contains 60 to 63 scales, while the straight part contains no to six scales followed by 23 to 30 scutes.

The King George whiting has the same overall profile as the rest of the sillaginid fishes, an elongate, slightly compressed body with a tapering head and terminal mouth. The genus Sillaginodes is distinguished by a first dorsal fin with twelve or thirteen spines and the second dorsal fin with a single spine and 25 to 27 soft rays. The vertebrae number between 42 and 44 in the genus. The King George whiting is the only member of the genus Sillaginodes and is further distinguished from any other possible taxa assigned to that genus by a number of distinct anatomical features.

Carey, R. Tetras and Barbs: A Complete Guide to the Successful Care and Breeding of Two of the Most Popular Groups of Aquarium Fish. TFH Publications, Inc., 2009 Additionally, tetras possess a long anal fin stretching from a position just posterior of the dorsal fin and ending on the ventral caudal peduncle, and a small, fleshy adipose fin located dorsally between the dorsal and caudal fins. This adipose fin represents the fourth unpaired fin on the fish (the four unpaired fins are the caudal fin, dorsal fin, anal fin, and adipose fin), lending to the name tetra, which is Greek for four.

Doradids are easily recognized by a well-developed nuchal shield in front of the dorsal fin, as well as well-developed bony lumps along the lateral line that form thorny scutes. Also, doradids typically have three pairs of barbels (no nasal barbels), an adipose fin, and four to six rays on the dorsal fin with a spine on the anterior (first) ray. These fish are sometimes called "talking catfish" because of their ability to produce sound by moving their pectoral spine or vibrating their swim bladder. Sizes range from SL in Physopyxis lyra to FL and in Oxydoras niger.

The rainfordia has an overall dark orange colour broken by six black-margined lilac stripes along each flank, the background orange colour is darkest on the centre of the flanks, fading to yellow on the back and belly. The spines in the dorsal fin are yellowish with a transparent membrane between them. The second dorsal fin has a dark base and a wide-angled yellow band just short of its edge which runs from the first soft ray to the tip of the seventh soft ray. The edge itself is whitish in colour and the remaining soft rays are reddish-brown.

The golden lined whiting has a very similar profile to other members of the genus Sillago, with a slightly compressed, elongate body tapering toward the terminal mouth. It differs from some members of the genus in that its ventral profile is more rounded than most other species, which tend to have a flat profile. The number of spines and rays, vertebrae and swim bladder morphology are other distinguishing features. S. analis has a first dorsal fin consisting of 11 spines followed by a second dorsal fin consisting of one spine and between 16 and 18 soft rays.

Cuvier's beaked whale has a short beak in comparison with other species in its family, with a slightly bulbous melon, which is white or creamy in color, and a white strip runs back to the dorsal fin about two-thirds of the way along the back. The rest of the body color varies by individual: some are dark grey; others are a reddish brown. Individuals commonly have white scars and patches caused by cookiecutter sharks. The dorsal fin varies in shape from triangular to highly falcate, whilst the fluke is about one-quarter the body length.

The shortnose whiting shares the same basic profile as most of the genus Sillago, possessing an elongate, slightly compressed body tapering toward the terminal mouth. The profile of the species is slightly leaner than most of its close relatives, which may be one initial key to field identification. More definitive diagnostic features include the spine and ray count of the dorsal and anal fins as well as the morphology of the swim bladder. The first dorsal fin consists of 12 or 13 spines, while the second dorsal fin has one spine and 22 to 24 soft rays posterior to the spine.

The holotype (MHNG 2679.100), likely a breeding male, has a standard length of 42.0 mm; Suriname: Sipaliwini: Paramaka Creek, Nassau Mountains Guyanancistrus nassauensis is a small-sized species, the largest specimen observed having a standard length (SL) of 61.0 mm. Head and body dorsoventrally depressed and wide. Dorsal profile gently convex from snout tip to dorsal-fin origin, usually more flattened posterior to orbit, slightly convex and sloped ventrally from dorsal-fin origin to adipose fin, then slightly concave to procurrent caudal-fin rays, and rising to caudal fin. Ventral profile flat from snout to base of caudal fin.

The small-eyed whiting is very similar in appearance to other members of the genus Sillago, with the only obvious distinguishing feature of the species being its unusually small eye size (only 14% to 16% of head length), as well as its swim bladder morphology. Other diagnostic features include the spine and ray counts, with the first spinous dorsal fin having 11 spines and the second dorsal fin having one spine and 19 soft rays. The anal fin has two spines followed by 19 soft rays. The species has 34 vertebrae and 68 to 69 lateral line scales, with cycloid cheek scales.

It has a continuous dorsal fin which has no demarcation between its spiny and rayed parts. The spiny part has 14-16 spines and is one and a half times to almost twice as long as the soft rayed part which contains 11-12 soft rays. The spines in the middle of the are the longest and are just a little bit shorter than the soft rays, which get shorter towards the tail. The anal fin is similar to the soft-rayed part of the dorsal fin, contains 3 spines and 11-12 soft rays and is situated opposite it.

Syncrossus beauforti resembles Syncrossus berdmorei but has 11-14 dorsal fin rays as opposed to 9–10 in S. berdmorei. Tn both species there are rows of small, dark spots running along the length of the body and the head, but in S. beauforti these markings are a slightly smaller and it has 9-12 faint vertical bars on its body. As the fish matures bars may fade leaving the longitudinal rows of dark markings. The dorsal fin has a black margin and 3 rows of spots, while the caudal fin has several vertical rows of spots.

The juveniles have a more oval to diamond shape, looking much like juveniles of the genus Alectis. The dorsal fin is in two parts, the first being greatly diminished and consisting of eight spines entirely embedded in the skin, with the second dorsal fin composed of one spine and 18 or 19 soft rays. The anal fin is composed of two anteriorly detached spines followed by one spine and 16 or 17 soft rays. Both juveniles and adults have highly elongated second dorsal and anal fin lobes, extended out into long filaments; they are most pronounced in juveniles.

The upper part of this band runs to a dark blotch at the base of the soft rayed part of the dorsal fin. Another dark band runs from the upper margin of the gill cover to the base of spiny part of the dorsal fin. There is also a narrow band which runs from the lower margin of the orbit to the base of the pectoral fin and then continues as a broken line along the lower part of body curving upwards on to the upper part of caudal peduncle. There is another wide band from maxillary groove to rear end of interopercle.

It is very similar in appearance to the Shimofuri goby (Tridentiger bifasciatus), but it has no white spots on the underside of its head and has a white margin to the second dorsal fin and the anal fins. T. bifasciatus has white spots on both the upper and lower part of the head and an orange-red margin to the second dorsal fin and the anal fins, but lacks the distinctive stripes that T. trigonocephalus has on these fins. T. bifasciatus prefers waters with a salinity of less than 22 parts per thousand, while T. trigonocephalus prefers higher salinities.

Merluccius senegalensis is a rather long-headed species in which the head is 24.9% to 27.7% of the fish's standard length. The total number of gill rakers is 13-18 on the on first arch. The anterior dorsal fin has a single spine and 9 to 10 fin rays and the posterior dorsal fin has 38-41 fin rays> The anal fin has 37-40 fin rays and the tips of pectoral fins normally extend to the origin of anal fin. The margin of the caudal fin is normally truncated, but as the fish grows it becomes progressively emarginate.

Sex can be most reliably determined by candling but the more common approach is to observe the shape of the dorsal fin: the male's dorsal fin is pointed, while the female's is rounded. The male croaking gourami is a bubblenest builder, creating a small nest from air bubbles and mucous under a leaf. The water level should be reduced to 8 inches during spawning, circulation kept minimal, and the temperature should be approximately 28 °C (82 °F). Spawning occurs under the nest, with the female responding to the male's dance by rolling over, followed by the typical gourami embrace.

The head is moderately long, with a blunt snout and long, broadly arched jaws. There are 4-5 rows of teeth on the upper and lower jaws of the blind side, and 2-3 and 1 rows on upper and lower jaws respectively of the eyed side. The teeth are sharp and recurved, and better developed on the blind-side jaws. The body is notably deep compared to other Symphurus species. The origin of the dorsal fin is located above the eyes and contains 88-94 rays. The dorsal fin pterygiophores and neural spines have a 1-2-2-2-2 interdigitation pattern.

The anal fin is nearly as large as the first dorsal fin and placed slightly ahead of the second dorsal fin. The caudal fin is large and broad, with the upper lobe longer than the lower and bearing a prominent ventral notch near the tip. The skin is thick and sparsely covered by large, well-calcified dermal denticles; each denticle has a diamond-shaped crown with three horizontal ridges. This shark is cream- colored with dark brownish to grayish mottling on the back and sides, and seven dark brown dorsal "saddles" on the body and tail.

As with most of the family Sillaginidae, the club-foot whiting has a slightly compressed, elongate body tapering toward the terminal mouth, with the species reaching a maximum overall length of 35 cm. The body is covered in small ctenoid scales extending to the cheek and head, which has scales arranged in 3-4 rows. The first dorsal fin has 11 to 12 spines and the second dorsal fin has 1 leading spine with 20 to 22 soft rays posterior. The anal fin has 2 spines with 22 to 23 soft rays posterior to the spines.

Two-spined blackfish are similar in shape and appearance to river blackfish, though their spiny dorsal fin usually contain only two spines (hence their scientific name) in comparison to river blackfish which have 7 to 13 distinguishable spines in their spiny dorsal fin. (In reality, this is a rather academic point as two-spined blackfish have blurred the difference between the dorsal spines and the dorsal rays that make up their soft dorsal fin, and any distinctions between the two weakly calcified dorsal spines and the dorsal rays that follow it are hard to pick in a living specimen.) The two-spined blackfish is similar to the river blackfish in spawning and diet; however, they prefer rocks and the interstices ("gaps") between to timber as the main spawning and habitat sites. Two-spined blackfish are also much smaller, commonly 15 to 17 cm and a maximum size of 30 cm. The species feeds mostly on aquatic insect larvae and terrestrial invertebrates, and occasionally other fishes and crayfish.

Suez fusilier Caesio suevica can reach a maximum size of 40 cm in length. These fishes are light silver blue, with fine gray stripes. The back shows a yellow line starting at the base of the dorsal fin. Ventrally they are paler.

Its body is deep, the dorsal and ventral profile is convex and the lower jaw exceeds the premaxilla. The dorsal fin is placed forward with respect to the pelvic fin.De la Maza-Benignos, M. and L. Vela- Valladares. 2009. “Cyprinodon julimes sp. nov”.

Life history and population characteristics of the prickly sculpin (Cottus asper Richardson) in Lake Washington. (Thesis). University of Washington. Both sexes develop an orange coloration along the edge of the first dorsal fin during breeding. The pectoral fins are large and fan-shaped.

The pelvic fins take the form of a large sucking disc located between the pectorals. The dorsal fin has 27 to 36 soft rays and both it and the anal fins overlap the caudal fin. The skin is slimy and lacks scales.

Schilbid catfishes usually have dorsal fins with a short base and a spine, but Parailia lack a dorsal fin altogether. Most species also possess an adipose fin. The base of the anal fin is very long. There are usually four pairs of barbels.

In some species, there are light-colored spots or blotches on the sides. Usually, the fins are similarly colored, but in some species there are bands on the caudal fin or an orange or red edging to the dorsal fin and caudal fin.

Blouw, D. M., & Hagen, D. W. (1981). Ecology of the fourspine stickleback, Apeltes quadracus, with respect to a polymorphism for dorsal spine number. Canadian Journal of Zoology, 59(9), 1677-1692. The fourth spine is straight and associated with the dorsal fin.

As suggested by the common name, it has distinctive dentition, the outer row of premaxillary teeth enlarged and recurved with arrow-shaped points. It can also be distinguished by a distinctive black pattern on the head and a uniformly dark first dorsal fin.

The flanks of the females are mottled brown and in some cases these are marked with indistinct vertical bars. The females may also show a narrow red band on the margin of the first dorsal fin and indistinct turquoise coloring on the chest.

The dorsal fin has 12 soft rays and has a deeply curved upper edge, and it has 31 - 32 vertebrae. The lips have rows of transverse ridges of tissue and they possess two pairs of well-developed barbels. They grow to 15 cm.

The juveniles mostly scavenge. There is a commercial fishery for this species and they are also displayed in public aquariums. As with many species in this family, the dorsal fin spines are venomous and any wounds inflicted by them must be promptly treated.

The body is strongly compressed. The dorsal head profile is steep, with a rounded snout. The body is greenish-brown to silvery with many brown to red-brown spots. Spines and rays of the dorsal fin are separated by a deep notch.

Females may also take on a darker color while fighting. Similar fish include the longjaw mudsucker, which can be distinguished from the northern tidewater goby by its more horizontal mouth and shorter rays in the anal fin compared to the 2nd dorsal fin.

Lesser weever fish occur in the eastern Atlantic from the North Sea around the British Isles to Morocco and Madeira, and in the Mediterranean. They are typically found resting on the bottom, partially buried with eyes and tip of first dorsal fin exposed.

McClane's Field Guide to Freshwater Fishes of North America. New York: Holt, Rinehart, and Winston. All minnows have one dorsal fin, ventral fins near the anus, a lateral line system (in most species), and smooth, round cycloid scales.Page, L.M. and Burr, B.M. 2011.

Some species log out of the water, which may allow then to travel faster. Their skeletal anatomy allows them to be fast swimmers. Most species have a dorsal fin. Most toothed whales are adapted for diving to great depths, porpoises are one exception.

It has a lateral line which is incomplete and often divided into two sections. The dorsal fin is deeply notched and has its origin in front of the pelvic fins. The first spine of the dorsal spine is small and projects forwards.

In comparison, the southern sleeper shark differs from S. microcephalushas in having more tooth rows in the lower jaw, a shorter interdorsal region, a more posterior first dorsal fin, and fewer precaudal vertebrae, and from both species in having lower dorsal fins.

Some adults have a black line running through the dorsal fin in the direction of its width. The body coloration is often dark with a grainy texture but can also be yellow, cream or reddish with blotches and numerous small dark spots.

The Atlantic white-sided dolphin was named by John Edward Gray in 1828. The specific name acutus comes from the Latin for 'pointed' and refers to the sharply pointed dorsal fin. L. acutus is one of six oceanic dolphins in the genus Lagenorhynchus.

The main difference is that the horned bannerfish does not have the reversed "v" pattern on its sides. Juveniles, which lack the white insert for the phantom bannerfish, can be distinguished by the shorter extension of the first rays of the dorsal fin.

There are 11–12 soft rays in the posterior part of the dorsal fin. The anal fin has three spines and eight to nine soft rays. The caudal fine is emarginate. The overall colour of the body is yellowish or brownish darkening dorsally.

The little gulper shark has no anal fin, two dorsal fins with spines, slightly humped back before the first dorsal fin, darker areas of coloration above gills and on dorsal fins, long free rear tips on pectoral fins, and a notched caudal fin.

Soft dorsal fin and anal fin have yellow rays. The mouth, snout and nape, and the area around the eyes are dark brown. The lower part of the head is light brown. There are also dark spots on the pectoral fin base.

The largest known specimen has a disc width of . This species can be distinguished from the similar D. zugei by a larger eyeball size, the absence of a dorsal fin fold on the tail, a larger maturation size, and various meristic characters.

Scorpaena Cardinalis has a laterally compressed body, more so posteriorly. There are many tentacles attached to the head. The fish has a dorsal fin with 12 toxic spines and 9 soft rays. The anal fin has 3 spines and 5 soft rays.

It also has two fins on top, the front fin has hard and sharp spines, the back fin has soft spines called rays. The most obvious features to recognize a ruffe are the ruffe's large, continuous dorsal fin and its slightly downturned mouth.

A thin line of gold speckles exists on the middle of the back, running from the nape to the dorsal fin. Gill covers are translucent with a large gold patch; iris golden and fins translucent grey to light brown or olive-grey.

Mojarras are silvery in color and fairly diamond-shaped. They have smooth scales, anal spines, and forked tails. Mojarras have a single dorsal fin, with spines of decreasing length along the fin. The dorsal and anal fins have scaly sheaths at their bases.

A Very narrow horizontal line pale whitish, crossing flanks. Dorsum of head and cheeks light brown. Clearly distinguished by the presence of only fine serrations on the anterior pectoral-spine margin. It has shorter dorsal-fin rays and a relatively shorter postorbital length.

They have a white area extending from its eye to the pectoral fin in the bottom. They have 3 vertical dark bands in their front. Juveniles have the same pattern but they are yellow. Around their dorsal fin, juveniles have a dark spot.

The papermouth has a silvery body with orange coloured fins. The dorsal fin is serrated and its scales are marked with radial striations. It grows to a maximum length of 40 cm and a weight of 1.4 kg. The mouth is positioned terminally.

The dorsal fin has 12 spines, followed by 10 rays. The anal fin has 8 rays. The pectoral fin is subequal to the head, and the ventral fin has 1 spine and 5 rays. The lateral line has 59 to 66 scales.

Around its spot, the top of its dorsal fin, the bottom of its anal and pelvic fins, there is a blue outline. The blue outline on its pectoral and anal fins are outlined with black. The caudal fin of this fish is clear.

In order to distinguished loach minnow from the similar speckled dace, the loach minnow have whitish spots that are present on the origin and insertion of the dorsal fin as well as on the dorsal and ventral portions of the caudal fin base.

The basic colour is bright red. It has silver scale margins, a spinous dorsal fin and a large deep red patch just behind the eyes. The lower jaw protrudes beyond the upper jaw. It bears a very long preopercle spine (near the gill-opening).

The head length is approximately 19 to 21 percent of the total body length. This species differs from the five other species in the genus in having at least 53 anal rays, 81 to 86 dorsal fin spines, and more rounded, deeper caudal fins.

Since the tail doesn't have a high degree of mineralization in comparison to the scales of the internal skeleton making then less likely to be preserved in the fossil record. The tail is also has a dorsal fin, which is an identifying characteristic of Antiarchs.

The colour of the stripes can vary by specimen, between bright orange-red and pinkish brown. Towards the posterior end, colouration turns grey. The dorsal fin has twelve spines and 13–15 soft rays. The anal fin has two spines and 15–17 soft rays.

Wood, The Guinness Book of Animal Facts and Feats. Sterling Pub Co Inc. (1983), Its appearance resembles that of a porpoise, but its conspicuous behaviour is typical of a dolphin. The dorsal fin has a long, straight leading edge which ends in a curved tip.

Thirteen branchiostegal rays support the gill membranes behind the lower jaw. There may be 11 to 21 dorsal fin rays, and 11-18 anal fin rays. These species have 47-64 lateral line scales. Species of this genus have between 47 and 58 vertebrae.

The head is rather small with its lower jaw protruding and mouth turned upwards. Coloration is highly variable, ranging from hues of yellow-green to brown to crimson. A row of 9-13 dark spots, each surrounded by a pale ring, lines the dorsal fin.

Frogfish (Histrio histrio) Marine Species Identification Portal. Retrieved 2012-01-04. The body and the fins are covered with many weed-like protrusions, but other than these, the skin is smooth without dermal spines. The dorsal fin has three spines and 11–13 soft rays.

The dorsal fin has 11 spines. The head is blunt and the mouth contains 6 to 8 incisors. The incisors of the juvenile have cusps.Branch, G.M., Griffiths, C. & Beckley, L. (2008):Two Oceans: A Guide to the Marine Life of Southern Africa. Struik. pg. 246.

It had a triangular shaped dorsal fin. Restoration of T. platyodon Like other ichthyosaurs, Temnodontosaurus likely had high visual capacity and used vision as its primary sense while hunting. Temnodontosaurus had the largest eyes of any ichthyosaur, and of any animal measured.Motani R.(2005).

The fish has a large mouth with a protruding lower jaw and a high and pointed dorsal fin. It is generally silver in color with a green, blue or brown back. The meat is white, flaky and somewhat oily. An adult fish weighs from .

The lateral line is not visible. The dorsal fin extends along nearly the whole top edge of the body, and the pectoral fin is "delicate" and "fan-like". Neocaristius heemstrai has since been moved from Paracasistius and placed in a new genus of its own.

This species is territorial, with territory holders threatening intruders. The attacker starts the encounter by raising its dorsal fin spines and emitting staccato thumping sounds; both fish may continue by biting at each other, or one may submit and flee, emitting drawn-out moans.

The genus name honours the Australian zoologist John R. Paxton of the Australian Museum in Sydney who provided the describers with the type specimens while the specific name means the uniting of disparate parts into a whole, a reference to this species continuous dorsal fin.

The dorsal fin is short and has no spine. The pectoral fins have an associated venom gland and as a result the fish is considered dangerous.Nelson, J. S.: Fishes of the World, John Wiley & Sons, Inc., p , 2006 They are oviparous; distinct pairing is possible.

There is a distinct black spot at the base of the tail. The head is dark above and white below. In the first dorsal fin is a thin black margin. There is a thin orange submarginal band and a wide diffuse black basal band.

It can be identified by its distinctive dorsal coloration of many brown blotches on a tan background, and the relatively forward position of its first dorsal fin. The International Union for Conservation of Nature (IUCN) presently lacks the data to determine its conservation status.

The bayad is more or less elongated. The dorsal fin has a smooth spine, and the pectoral fins have spines with serrations on the inside. There are four pairs of barbel anatomy barbels. The maxillary barbels may reach to the ventral fin or pelvic fins.

The first ray of the dorsal fin and the pectoral fins have a hardened first ray which is serrated. The caudal fin is forked. It has short, cone-shaped teeth in the upper jaw. In the lower jaw, the teeth are s-shaped and movable.

On the dorsal fin the stripes are vertical. The outer edge of the caudal, dorsal and anal fins is white, while the pectoral fins are yellow. Sexing is difficult, but males do have a small genital papilla and females are generally plumper than the male.

Its nostrils are sealed, and it has an enlarged mouth with a mobile cheek. Its body has a fleshy dorsal fin. Most caecilians have a well-developed right lung and a vestigial left lung. Some, such as Atretochoanas relatives, have two well-developed lungs.

Adults of this species can grow up to TL. This fish is white in colouration with a yellow caudal fin. Its dorsal fin has 12 spines and 14 to 15 soft rays. Its anal fin has 2 spines and 11 to 12 soft rays.

The first ray of the dorsal fin and the pectoral fins have a hardened first ray which is serrated. The caudal fin is forked. It has short, cone-shaped teeth in the upper jaw. In the lower jaw, the teeth are s-shaped and movable.

Enneapterygius mirabilis, the miracle triplefin, is a species of triplefin blenny in the genus Enneapterygius. It was described by Ronald Fricke in 1994 who gave it the specific name mirabilis, meaning "admirable", because its notable large pectoral fins and first dorsal fin were pretty.

Male with elongated second dorsal spine preserved, from Koror, Palau, Bluestripe pygmygobies are tiny fish, usually averaging at . The maximum recorded length is . The dorsal fin has seven spines and eight to nine soft rays. The second dorsal spine in males is elongated and filamentous.

C. sloani has a forked caudal fin, an adipose fin, and a dorsal fin located immediately behind head. Almost all of its fins contain soft rays. C. sloani has a low lipid content (~2.4%). The body is enveloped in a thick, transparent, gelatinous casing.

The anal fin has 57 to 67 soft rays and it and the dorsal fin are continuous with the caudal fin. The upper side of the fish is greyish-brown, with black blotches, arranged in indistinct longitudinal rows. The underside of the fish is whitish.

The black rockfish is a blackish grey fish with a large mouth, spinous dorsal fin, and dark stripes for its eyes to its gills. This fish can weigh up to 11 pounds and grow up to 27.6 inches by the time they reach adulthood.

Harvestfish have 2-5 total dorsal spines, 38-47 total soft dorsal rays, 2-3 anal spines, and 35-45 soft anal rays. The Harvestfish also lacks the mucous pores situated below the anterior half of the dorsal fin that are conspicuous in the butterfish.

There is no dark opercular spot. The distal area of the second dorsal fin lobe is strongly black, usually with a white tip while the remainder of the fin is dusky. The caudal fin is yellow and all other fins are whitish to hyaline.

Fins somewhat fleshy at their bases, moderately long and rounded. Anal and dorsal fin bases roughly equal and moderately long. Pectoral fins relatively short and paddle shaped and low on the body. Pelvic fins also short and positioned about the mid point of the body.

It has scaled jaws and snout, and its scales are quite small. The dorsal fin begins immediately above the center of the species’ eyes. It is light brown in color, and has 6 to 7 cross bars on its body of a slightly darker hue.

The flans are usually marked with irregular faint longitudinal light stripes. It also has 6 spines and 9-10 soft rays in the dorsal fin while the anal fin has 3 spines and 34-42 soft rays. It has a count of 25 vertebrae.

It is dark green on the dorsum, white on the sides with a gold tint especially heavy on the belly. Fins are pale colored with a dark green dorsal fin. This species can reach a length of TL. It was important to local subsistence fisheries.

The highest body depth (about 31% of standard length) occurs exactly at the dorsal fin insertion. The lateral line is complete and curved. In preservative, the colour of the back is dark brownish; the abdomen is light grayish. Pelvic and anal fins are light yellowish.

The fish has a thick, deep caudal peduncle (tailside), a large head and an enlarged mouth, with small lower lips. The dorsal fin is slightly hooked and squared.Page, L.M. and B.M. Burr. 1991. A field guide to freshwater fishes: North America, north of Mexico.

The Ceylon killifish (Aplocheilus dayi) is a species of killifish endemic to Sri Lanka. This species grows to a length of . Males and females have a black dot at the rear end of the base of the dorsal fin. The females lay 50–150 eggs.

This fish reaches 8.5 centimeters in length. It is bright blue in color; the male has a yellow snout and tail, and the female and juvenile usually lack yellow but have a black spot at the base of the back edge of the dorsal fin.

Pearlfishes are slender, distinguished by having dorsal fin rays that are shorter than their anal fin rays. They have translucent, scaleless bodies reminiscent of eels. The largest pearlfish are about in length. They reproduce by laying oval-shaped eggs, about 1 mm in length.

Once settled, females rarely migrate. New juveniles can usually join groups easily. As they reach sexual maturity, they usually lose their "eyespot" on their dorsal fin. P. amboinensis is a protogynous species - all individuals start out as females and later can turn into males.

The specific name means "seven rayed" and refers to the seven short rays in this fish's first dorsal fin. P. septemradiatus is the only fish known to communicate acoustically while out of water and when they are alarmed they dash towards land rather than water.

The anterior dorsal fin has 5 spiny rays, and the posterior has a single spiny ray and 9 soft rays. It has relatively small pectoral fins, and the pelvic fins are directly below the forwardmost point of the first dorsal fin; The anal fin has a one spiny ray and 9 soft rays. S. sphyraena has scales covering both the anterior and posterior margins of the preoperculum, whereas in Sphyraena viridensis both margins have no scales. They are normally around 30–60 cm in length and weigh 6 kg, but there are records of fish 165 cm long and reaching weights of at least 12 kg.

Argyropelecus sladeni is a small, deep-bodied hachetfish with an abdominal keel and a maximum standard length of about . The mouth is of medium size, the tubular eyes point upwards, the dorsal fin has nine soft rays and is three times as long as it is high, and the adipose dorsal fin has a long base. The pectoral fins have 10 to 11 soft rays, the pelvic fins have 6 and the anal fin is in two parts, with seven soft rays in the front part and five behind. The upper pre-opercular spine is long and slopes upwards and backwards, while the lower one slopes downwards.

It has three spines in the anal fin, 10 spines in the dorsal fin, and small teeth are present on the tongue. These fish range in size from 4 to 10 inches (10.2 to 25 cm), but can grow to over 12 inches (31 cm) in length, and weigh up to 2.25 pounds (1 kg). The warmouth is occasionally confused with the rock bass or green sunfish, both of which share its relatively large mouth and heavy body. However, the green sunfish generally has a greenish-blue variegated pattern on its gill flaps, a black spot near the base of the dorsal fin, and its fins are bordered in yellowish- white.

The dorsal fin has 8 spines and 13–16 soft rays while the anal fin contains 3 spines and 12–13 soft rays. The colour of this species normally ranges from pale yellow or greyish-yellow to bright yellow with a dark bar which runs through the eye and another wider dark band on the posterior part of its body with yellow fins. The larger fishes can be nearly all black with yellow fins. The small juveniles are bluish in colour on the anterior part of their bodies and yellow on the posterior part, they also have a spiny part of the dorsal fin coloured black.

This behavior usually involves displaying more dull colors when attempting to camouflage itself, and flashing brighter colors in the presence of a predator. Likely the most unique aspect of this fish is the patterning of the dorsal fin itself. The fourth dorsal spine is nearly twice the length of the others, and there exists a distinct black mark appearing somewhere along the membrane between the first and third dorsal spines, with the combination of the two traits resulting in the dorsal fin having the appearance of an even smaller fish. I. signifer utilizes this morphological feature in a coordinated luring mechanism not seen in any other members of the Scorpaenidae family.

The fivebeard rocklings is a long, slender fish which may attain a length of . It has a smooth, scaleless body with unusual and long dorsal, which is made up of a first ray followed by a line of vibrating rays in a furrow in the back. The front part of the dorsal fin does not have any membrane connecting the rays although the rear dorsal fin is which runs the length of the body, as does the anal fin, is made up of rays connected by membrane. It has five barbels around its mouth, two above either nostril and a single barbel on the lower jaw.

The lipstick darter is a small fish with a laterally compressed body and it attains a maximum standard length of around . It has 8-9 square shaped blotches along its back and 5-6 faint vertical bars towards the tail on the flanks. Adult males have obvious red-orange colored lips and large spots along the flanks of a similar color, as well as showing orange and blue-green coloration on the anal fin. When they are spawning, the first dorsal fin of the males takes on a dusky hue and with an orange margin while the second dorsal fin has an orange band immediately below a blue marginal band.

The genus is closely related to the genera Ceratobregma and Enneapterygius. The species in this genus are characterised by the possession of a discontinuous lateral line which comprises a series of 17-31 tubular pored scales at its anterior end and 13-21 notched scales in a series towards its posterior end. The belly is half covered in scales while the head is lacking in scales but it does have tiny spines in the occipital area. The first dorsal fin has three spines, the second dorsal fin has 11-19 spines while the anal fin has two fused spines and the pelvic fin has a single spine and two rays.

The zebra mbuna has a single dorsal fin with sixteen to nineteen spines and seven to ten soft rays. The anal fin has three to four spines and six to nine soft rays. It grows to a maximum length of SL. The male fish varies in colour in different parts of its range, in some locations having a dark head, throat and belly and in others a blue head, whitish throat and grey/blue belly. In both cases the body is bright blue with up to eight grey/black bars, the dorsal fin is blue and the anal fin is blue to grey, with one to five orange to yellow spots.

The grooved mullet has a total of five spines in its dorsal fins and eight or nine soft rays, the anal fin has three spines and eight or nine soft rays. The anal fin and the lower lobe of the caudal fin are coloured whitish or greyish. The body is coated in ctenoid scales apart from the scales in front of the anterior dorsal fin which are cycloid, extending to the front nostril or slightly beyond it. Its scales are small and numerous and there are 33–41 scales in a longitudinal series, not including those on the caudal peduncle, and 11–14 scale rows between pelvic and anterior dorsal fin.

Hirundichthys rondeletii has an elongate body which is almost rectangular in cross-section, being somewhat flattened ventrally. It has a short, blunt snout with a small mouth in which the jaws are nearly equal in length and are equipped with conspicuous teeth but there are no palatine teeth present. It has a low dorsal fin which has 10-12 soft rays while the anal fin has 11 to 13 soft rays and originates just before, or below the first or second dorsal fin rays. The pectoral fins are 1.3 to 1.4 the standard length and contain 17 to 19 soft rays, of which the first 2 rays are unbranched.

The striped boarfish has a very deep body which is steep behind the head and rounded underneath the soft part of the dorsal fin. It has an elongated snout which is sturdy in adults and has dense whisker like structures referred to a villi on the lips and chin, the ones on chin being very long and sometimes branched. The dorsal fin is tall and sail-like, contains 4 or 5 stout spines and 26-28 soft rays and has a convex margin towards the rear. The spines get longer from the front to the back but the front soft rays are longer still than the rear spines.

In young adults, the lobe of the second dorsal fin is often falcate, but usually shorter than the head length. The anal fin has two anteriorly detached spines followed by a single spine attached to 21 to 26 soft rays, while the pelvic fin has one spine attached to 20 or 21 soft rays. The lateral line has a gentle anterior arch, with the junction of the curved and straight sections vertically below the 15th to 20th soft rays of the second dorsal fin. The curved section of the lateral line contains 82 to 90 scales, while the straight section has 12 to 17 scales and 26 to 31 scutes.

Boutan's whiting has a very similar profile to other members of the genus Sillago, with a slightly compressed, elongate body tapering toward the terminal mouth. The species is very similar to much more common Sillago sihama and is often misidentified, with counts of spines, rays and lateral line scales needed for identification. The first dorsal fin has 11 spines of which the posterior most one is very small, with the second dorsal fin having one spines followed by 21 soft rays. The anal fin has two spines followed by 21 or 22 soft rays, while the lateral line scale count is 76 to 80 and the vertebrae count is 38.

The magnificent catshark or clown catshark (Proscyllium magnificum) is a species of finback catshark, belonging to the family Proscylliidae, known only from five specimens collected in the northern Andaman Sea near the edge of the Myanmar continental shelf. Its common names refer to its distinctive, elaborate color pattern of small and large dark spots, which include "clown faces" beneath each dorsal fin. Reaching in length, this species has a very slender body with a short, flattened head and a large lobe of skin in front of each nostril. The first dorsal fin is placed behind the pectoral fins but ahead of the pelvic fins.

The dorsal fin contains 11 spines and 14-15 soft rays, while the anal fin has 3 spines and 7-8 soft rays. The caudal fin varies from convex to slightly rounded. The head and body tan and they are marked with dark brown bands. There is a forked band starting at the posterior margin of the eye, its upper branch reaching a dark brown saddle-like blotch on the nape just in before of origin of the dorsal fin while the lower branch runs to lowest of the spines on the gill cover before continuing along the flanks and then forking over the pectoral fin.

Oxynoemacheilus galilaeus has the elongated, subcylindrical body shape typical of stone loaches with its mean depth being 15.5% of its length and that of the caudal peduncle being 10.4% while the head makes up a mean of 21.2% of the standard length. The origin of the dorsal fin sits in front of the vertical origin of the pelvic fin, the dorsal fin has a slightly convex to near straight upper margin and it has 4-5 unbranched and 9-11 branched rays. The anal fin has 3-4 unbranched and 5-6 branched rays. The caudal fin is slightly emarginated but can look truncated.

The anal fin is similar in shape to and lies opposite to the soft-rayed part of the dorsal fin. It has a very large and deeply forked caudal fin It has small pectoral fins in which the upper rays are the longest and small pelvic fins, located below, and just to the rear of the base of the pectoral fins. The dorsal fin has 14-16 spines and 11-12 soft rays while the anal fin has three spines and 11-12 soft rays. It can reach a length of standard length and average weight of standard weight to standard weight, but can exceed .

Siganus rivulatus has a laterally compressed body which has a standard length of 2.7-3.4 times its depth The dorsal fin has 13 spines and 10 soft rays, the anal fin has 7 spines and 9 soft rays, there are 23 vertebrae and the caudal fin is forked. The longest spine in the dorsal fin is shorter than the distance between the eye and the edge of the operculum while the length of the snout is equal to or greater the length of the snout. The slender spines are barbed and bear venom. The teeth are incisor-like with lateral cusps and are arranged in a single row in the jaws.

It has a dark brown stripe that extends from the head to the dorsal fin, and has a steel-blue stripe along the side that has a thin pink to red line bordering above. The base of the caudal fin has a small red spot on the top and bottom of the side, while a black spot is on the center of the side of the base of the caudal fin. The dorsal fin has a dusky central band, and other fins are a yellow to light orange. The dorsal and anal fins are almost triangular, resembling sails, from which their common name is derived.

The second dorsal fin measures about 67-77% as tall as the first and is similar in shape; there is no midline ridge between the dorsal fins. The anal fin is almost as large as the second dorsal fin and lies slightly behind; it has a deep notch in the posterior margin. The caudal fin is asymmetrical; the lower lobe is narrow and well-developed, while the upper lobe has a gently convex upper margin and a prominent notch in the ventral margin near the tip. The body is covered by small, overlapping oval-shaped dermal denticles bearing three or five horizontal ridges leading to marginal teeth.

The banded bellowsfish has a very deep, nearly round, highly compressed body, with a depth which is equivalent to 38–62% of its standard length. Its upper and lower body profiles are asymmetrical, as the nape of small specimens has an angular hump which becomes more angular and obvious as the fish grows into an adult. It has a long, tube-like snout, which is between a quarter and a third of the standard length. The spines of the dorsal fin are set into another hump on the posterior part of the fish's back, and the second dorsal fin is large, equivalent to just under half of the standard length.

Two separate dolphins appearing as if they're one dolphin by perspective The rhinoceros dolphin (Delphinus rhinoceros or Cetodipteros rhinoceros) is a purported species of dolphin – or dolphin-like whale – said to have an additional dorsal fin on or near the head, reminiscent of a rhinoceros horn. Jean René Constant Quoy and Joseph Gaimard allegedly discovered this dolphin off the coast of the Sandwich Islands and New South Wales. It supposedly possesses two dorsal fins, much like Giglioli's Whale. One is near the head, where the neck would be on terrestrial animals, and the other is farther back than the dorsal fin of any other dolphin.

416 p. Its body is compressed laterally, the first rays of its dorsal fin stretch in a long white filament. The background color of its body is white with two large black diagonal bands. Beyond the second black stripe, the dorsal and the caudal fins are yellow.

Navigation and hunting are carried out using echolocation. They are unique among cetaceans in that they swim on their sides. The body is a brownish color and stocky at the middle. The species has only a small, triangular lump in the place of a dorsal fin.

This species is bronze above and white below, with a barely noticeable pale band on the flanks. The pectoral, pelvic, and anal fins sometimes have lighter margins, while the first dorsal fin and upper caudal fin lobe may have darker margins. The hardnose shark reaches in length.

Springer- Verlag, Berlin. The round scad has nine spines on its dorsal fin and 30 to 34 soft rays. Their anal fins have only three spines and 26–29 soft rays. Round scad often have a yellow stripe running from the head to the caudal peduncle.

This species reaches up to 2 cm (0.9 in) in standard length. They are found in low-movement waters with a slow current and a muddy, silty, or sandy bottom. They prefer clear waters with submerged vegetation. Black spots occur on the base of its dorsal fin.

Banded rudderfish, Seriola zonata, is the second-smallest amberjack. This jack can be distinguished from the pilot fish by the presence of a first dorsal fin. Juveniles are banded vertically like pilotfish, and follow large objects or animals. Large individuals (over 10 inches) have no bands.

The first dorsal fin has an orange band bordered on both sides by black bands. The end of the tail fin is almost straight. The fins have black or brown dark marks on them. The large eyes are near the top of the head of the fish.

There is a single dorsal fin, and only the male has a pelvic fin. There are no scales. The larva-like female has a nearly transparent body with its ovary visible through the body wall. The female and primary male have upper and lower conical teeth.

The fourspot triplefin grows to a maximum length of . Like other members of its family, the dorsal fin is divided into three sections. The first two are spinous with a total of fifteen to nineteen spines, while the third fin has eight to eleven soft rays.

It has a small head with a short, broad snout, an inferior mouth and a long barbel on the lower jaw. The first dorsal fin is black with white base and tip. There is a small bioluminescent organ located between the bases of the pelvic fins.

The tail terminated in a large, semicircular, leathery, vertical caudal fin and even a triangular dorsal fin was present. One well-preserved fossil of Stenopterygius preserves traces of skin, from which the animal's coloration was discovered to be countershaded (darker on the back than the underbelly).

The dorsal fin has a yellow margin and there is a bright orange patch running through the caudal peduncle. It is found in coral-rich areas and clear waters of seaward and lagoon reefs. This fish feeds on filamentous algae and coral polyps and other benthic invertebrates.

Also the teeth are placed side by side, are weakly attached to the jaw and are primarily used for cutting leaves. Sexually mature male of Tometes differ from females by an additional anal-fin lobe, an elongated dorsal fin or a red pattern on the body.

Ross, S. T. 2001. The Inland Fishes of Mississippi. University Press of Mississippi, Jackson. 624 pp The bluegill is most closely related to the orangespotted sunfish and the redear sunfish, but different in a distinct spot at or near the base of the soft dorsal fin.

A large black spot is usually present on the shoulder, with smaller dark spots on the operculum and pectoral fin axil. The soft dorsal, anal, and caudal fins are dusky, with the spinous dorsal fin black. The pectoral and pelvic fins are hyaline to white in colour.

Its tail bears a rather large dorsal fin in front of the stinging spine, and ends in a deep, lance-like caudal fin. Negligibly affected by human activity, the circular stingaree has been listed under Least Concern by the International Union for Conservation of Nature (IUCN).

There is a distinct patch of red colour on the anal fin and the upper and lower lobes of the tail are pointed. The dorsal fin has 10 spines and 10-12 soft rays while the anal fin has 3 spines and 11-12 soft rays.

The beak is poorly demarcated. The flippers, dorsal fin, tail fin and back are a dark grey. The sides are a slightly speckled, lighter grey. The underside is much whiter, though there are usually grey stripes running along the throat from the underside of the body.

Its specific epithet is after its discoverer Dr. Graham Butler. This species reaches a maximum length of . It has a stout, laterally compressed body with a large head longer than deep. Like other anglerfishes, the first dorsal fin ray is modified into a lure for attracting prey.

Ogcocephalus notatus attains a maximum length of about . The fins have no spines; the dorsal fin has five soft rays, the anal fin has four and the pectoral fins each have at least thirteen rays. The mouth is wide and the pupils of the eyes are oval.

Identification of this species is very easy due to the pattern of harness-like markings that cross the eyes, run along the back to the first dorsal fin, then cross the side of the body, in addition to the spine in front of both dorsal fins.

Hoplopteryx has a dorsal fin supported by nine unjointed, bony rays, deeply forked, homocercal tail, a moderately developed anal fin, and a pelvic fin located well forward. The snout is quite short, the eyes fairly large, and both jaws of the upturned mouth hold small teeth.

The rosy-lipped batfish only has two and a half gills, with none appearing on the reduced first gill arch. Ogcocephalus porrectus has 2 or 3 dorsal fin rays and 14 pectoral fin rays.Hubbs, C.L. 1958. Ogcocephalus darwini, a new batfish endemic at the Galapagos Islands.

The scaleless skin of P. nkunga is coated in mucus, and its mouth is surrounded by four pairs of sensory barbels. The spines of the serrated dorsal fin, which can lock into an erect position, are covered in toxic mucus that can be poisonous to humans.

Both sexes have 24 vertebrae, of which 11 are precaudal and 13 are caudal. . The marlin has two dorsal fins and two anal fins. The fins are supported by bony spines known as rays. Its first dorsal fin has 39 to 43 rays from front to back.

They also have relatively larger dorsal fins. The adults have a white spine on the caudal peduncle. The large, sail-like dorsal fin has 4 or 5 spines and 23 to 25 soft rays. The anal fin has 3 spines and 19 to 21 soft rays.

The first dorsal fin has 6-10 flexible spines.Review of Croatian selected scientific literature on species mostly exploited by the national small-scale fisheries on FAOAdriaMed.org It is an omnivorous species feeding on zoo-plankton and small bottom-living animals (crustacean gammarids, polychaete worms and molluscs).

They have triangular snouts with a single, sinistral and lateral spiracle. The tail fin is transparent and pointed with moderately developed musculature. Slight pigmentation is visible on the skin of tail muscles and tail fins. The height of the dorsal fin is greater than the ventral fin.

Ross et al., 2001. At maturation, the golden topminnow becomes slender with a rounded caudal fin and a deep caudal peduncle. The mouth is small and slightly superior and the dorsal fin is set far back on the body and begins posterior to the anal fin origin.

Eyes relatively large and set high on the head. Mouth positioned at the end of the snout, medium sized with a shorter lower jaw. Fins fleshy at the base, less so in paired fins. Anal fin has a long base whereas the dorsal fin base is short.

Kryptopterus is a genus of catfishes belonging to the family Siluridae. They are found in freshwater throughout Southeast Asia. The scientific name comes from Ancient Greek kryptós (κρυπτός, "hidden") + ptéryx (πτέρυξ, "fin"). It refers to the reduced or even entirely absent dorsal fin of these catfishes.

Houghton Mifflin Company, Boston, 432 pp. Sand Shiners usually have seven anal soft rays, fewer than 10 dorsal fin soft rays, and fewer than 45 lateral line scales. They have no spinous rays meaning none of their rays are hard. Their pharyngeal teeth count is 0,4-4,0.

Another focus of the design changes was weight savings, as a result the 162's seats were redesigned and the seat structure changed from composite to aluminum. With the new larger fin the dorsal fin was unneeded and was deleted from the design to save weight.

The redlip shiner is characterized by bright red lips with a similar coloration in the dorsal, anal, and caudal fins. The body is slender and compressed, with the dorsal fin origin slightly behind pelvic fin origin.Burr, B. and Page, L. (1991). Peterson Field Guides: Freshwater Fishes.

King angelfish generally grow to 35 cm long. They have between 18 and 20 rays in their dorsal fin and each of their pectoral fins, and 17 to 19 in their anal fin. They also have a strong spike under their lower cheek for defensive purposes.

The central cusp in all teeth is two to three times as long and broad as the other cusps. All cusps slightly curved towards the mouth's interior. The animal possesses 9 dorsal fin rays. Its first unbranched ray is half of the length of its second ray.

Spiniphryne, also called spiny dreamers, is a genus of dreamers. Like other deep-sea anglerfish, Spiniphryne lure prey to them by means of a modified first dorsal fin ray with a bioluminescent bulb at the tip. Spiniphryne is unique amongst the oneirodids for being covered in tiny spines.

Petrocephalus arnegardi grow to SL. It is a silvery white fish with three distinct bilateral melanin marks: one slightly anterior to the dorsal fin, another one at the base of the pectoral fin, and one centered at the base of the caudal fin. Mouth is small and subterminal.

Axelrod's clown blenny Ecsenius axelrodi is a small species growing to a maximum length of . The dorsal fin has 12 spines and 12 to 14 soft rays. It is deeply notched between the two portions of fin. The anal fin has 2 spines and 14 to 16 soft rays.

The dorsal fin has 3 to 4 spines of nearly equal length, and 44 to 47 soft rays. The anal fin has a single spine and 36 to 39 soft rays. The dorsal and anal fins bear a row of small yellow spots. The caudal fin is rounded.

The dorsal fin has five spines and twenty- one (occasionally twenty-two) soft rays. The fourth spine is the longest. The anal fin has a single spine and eighteen or nineteen soft rays. The general colour is pale reddish or greyish brown, shading to white on the underparts.

One small dorsal fin is close to the sharply pointed, mostly scaleless head. The tail fin is greatly reduced, with the anal fin being the largest fin. Their pectoral fins are slender and greatly elongated. Their mouths are somewhat large, with the lower jaw shorter than the upper jaw.

In order to perform this "walking," they use their dorsal fin from one side to side, then thrust their caudal fin repeatedly, and then maneuver using their pectoral and pelvic fins. It was also observed that these specimen are capable of walking backwards using their pectoral and pelvic fins.

Specimens from other geographical regions show differences in colouration to the above which represents the population from the type locality. The dorsal fin has 10 spines and 17 soft rays whil the anal fin has 3 spines and 8 soft rays. This species attains a maximum total length of .

Its general colouring is yellowish-pink with a yellow head and two rows of irregular dark golden blotches along the body. The fins are generally yellow with darker basal areas on the first dorsal and pectoral fins. The first dorsal fin has spiked rays, the third being the longest.

Assessor macneilli is a dark blue fish which has a thin paler blue edge on the dorsal, anal, and pelvic fins. The dorsal fin has 11 spines and 8-10 rays, the anal fin has 3 spines and 9-10 rays and the pectoral fins have 14-16 rays.

Closeup of Macquarie perch head Macquarie perch are a medium-sized fish, commonly 30–40 cm and 1.0–1.5 kg. Maximum size is about 2.5 kg and 50 cm. Their body is elongated, deep, and laterally compressed. The caudal fin, anal fin and soft dorsal fin are rounded.

Pempheris multiradiata has a large aeye and a large oblique mouth. It has a deep, compressed body which tapers, steeply towards the tail. It has a high dorsal fin with a short base and a long based anal fin, the fin bases being scaled. It has large eyes.

The caudal fin has a black bar at itrs base and the membrane is marked with black spots. The dorsal fin has twin lines of black spots along it while the base of the anal fin has a single line of black spots. The maximum publsihed total length is .

Like many other madtom, the Checkered Madtom has a stout body. The body is yellow and has four obvious saddle-like stripes of black on top. The bottom is white to yellow. The dorsal fin on the back has a black blotch on the top third of the fin.

Live fish is colored silvery with black markings on the lateral line scales and the lateral line is complete and is little concave with 28 scales and a light band above the lateral line. black markings are present in caudal peduncle, operculum and dorsal fin is black in shade.

Stenodus nelma is an anadromous fish, up to in length. The fish has a large mouth with a protruding lower jaw and a high and pointed dorsal fin. It is generally silver in color with a green, blue or brown back. The meat is white, flaky and somewhat oily.

The soft rayed part of the dorsal fin, the caudal fin and the pelvic fin are dusky grey while the pectoral fins are greyish or orange-red. In some specimens the jaws and lower parts of the head are pale reddish brown. The maximum recorded total length is .

The remaining portion of the dorsal fin is made up of seven branching rays. The spine of the pectoral fin is serrated on both sides. The adipose fin is 3 to 4 times as long as it is deep. The anal fin contains four unbranched and seven branched rays.

The spinous dorsal fin is situated above the pelvis. The hind end of the caudal fin is forked or concave, and it is set at the end of a stout peduncle. The pectoral fins are placed low down on the sides. The barracuda has a large swim bladder.

1878 illustration The Irrawaddy dolphin's colour is grey to dark slate blue, paler underneath, without a distinctive pattern. The dorsal fin is small and rounded behind the middle of the back. The forehead is high and rounded; the beak is lacking. The front of its snout is blunt.

The eyes are small, dorsolaterally located, and under the skin (subcutaneous). The maxillary barbels do not extending beyond the head. The dorsal fin spine is serrate anteriorly and smooth posteriorly. S. chennua, S. rheophilus, and S. torosus grow to about SL. S. rabdophorus attains a length of about SL.

The anal fin has two detached anterior spines, followed by one spine and 17 to 19 soft rays. The lobe of the soft dorsal fin is falcate, being about the same length as the head. The pelvic fin consists of one spine and 18 or 19 soft rays.

There are five pale silvery blue longitudinal lines running down either side, the lower 3 reaching the tail but the upper two breaking into irregular streaks.Slender grouper World Database of Marine Species. Retrieved 2012-04-19. The dorsal fin has 11 spines and 14 to 16 soft rays.

The bases of the pelvic fins extend past the first dorsal fin base. The caudal fin is broadly triangular, with a gently convex trailing margin. The skin is entirely devoid of dermal denticles. This species is light tan above and lighter below, darkening slightly towards the disc margins.

The Sargassum blenny has two quite distinct dorsal fins. The face is elongated and the mouth resembles that of a pike. There are no cirri. The general colour is brown with patches of silver on the flanks and there are 2 blue eyespots on the posterior dorsal fin.

Then, for both sex and all areas the body coloration is quite the same. Grey-blue for the anterior part of the body and yellowish for the posterior part with a slight gradient at the junction. A dark spot occurs on the first rays of the dorsal fin.

There is a white stripe running from the tip of the lower jaw along he top of snout, head, and along the base of the dorsal fin. The maximum published total length for this species is , although fish around in length are more common. The maximum published weight is .

The Louvre dolphin type fish palette is a Naqada I, or II palette. It has simple fish fin grooves on its tail, and its dorsal fin, towards the rear. The palette has an inlaid white eye, (often of shell). Because of its extended length, it contains three suspension holes.

The Royal Australian Air Force, Republic of Korea Air Force and the Turkish Air Force are deploying Boeing 737 AEW&C; aircraft. Unlike the E-2 and E-3, the Boeing 737 AEW&C; does not use a rotating disk radome (rotodome) but instead has a large dorsal fin.

The male, overall dark gray to black, has a lighter "saddle" marking between the blowhole and dorsal fin on its back. Males also carry scars typical of the genus. Females are slate gray with grayish-white flanks and belly. Cookie cutter shark bites are present in both genders.

Chapman and Hall, London described three morphological characteristics which persist through all stages from larvae to maturing eels: the total number of vertebrae (mean 107.2), the number of myomeres (mean 108.2), and the distance between the origin of the dorsal fin to the anus (mean 9.1% of total length).

His dorsal fin flopped completely over to his right rather than the left. His pectorals were huge and his flukes were curled completely. His enormous size can be seen in his daughter, Orkid, who grew up to be quite a large female. She is Orky's only living (captive) relative.

The adult is mostly black with silver speckles on the body and barring on the dorsal fin. Unlike I. persa, the breast and head of nuptial male I. hormuzensis is blackish (not orange). Although it has not been rated by the IUCN, some authorities believe it is highly threatened.

The membranes between the dorsal fin spines are notched. The caudal fin is rounded. This species is pale brownish-grey in overall colour and it is covered in large dark widely separated blotches. Dark lines radiate out from the eyes and there are small dark spots on the fins.

Females also have a patch in the center of the dorsal fin and a spot on the lower part of the gill cover. Females are smaller than males. Males are duller in color and have longer, more pointed fins. Both male and female become more vibrant during breeding.

It grows to a maximum size of total length. The body is powder blue in colour with a pattern of narrow, white chevron-shaped bars. The head and front of the body are coloured intense red- orange. The back of the dorsal fin and the caudal fin are black.

The back is a light olive gray, the sides silver, and the belly white. The dorsal fin usually has nine rays, and the anal fin 10 or more. Maximum recorded length is 38 cm.William F. Sigler and John W. Sigler, Fishes of Utah (University of Utah Press, 1996), pp.

Dorsal fin is very long and reaches almost to the tail. Both sexes have a small dark spot at base of caudal fin and a dark blotch just above pectoral fin. Also, many darker spots on the body form 3 or 4 longitudinal stripes. Generally, color reflects sexual dimorphism.

The smoothskin scorpionfish is a small, well-camouflaged fish, with an orange body having a distinctive cream patch to the rear. The fish may reach 50 mm in total length. The head has a pleated, wrinkled appearance and the dorsal fin has spines. The head may occasionally be pinkish.

Physically identifying features of Hiapo included a five o'clock shadow on his throat, also sometimes described as the outline of a handsome dolphin tuxedo, a dorsal fin that drooped to the left, and a particularly large fluke and tail. In the Hawaiian language, Hiapo means first-born son.

247–48 The Yak-210 first flew on 1 August 1953 and it received some of the improvements given to the Yak-200 including the dorsal fin. Its radome was changed from its initial oval shape to a teardrop during testing. It could carry of practice bombs.Gunston, p.

The fish is covered with minute spinules that give it a velvety texture. The lateral line system has prominent open canals. The pectoral fins are small, with 14 fin rays. The first dorsal fin ray is modified into an angling apparatus (the illicium) with a lure (the esca).

The crested bandfish (Lophotus guntheri) is a species of crestfish in the family Lophotidae. It has a long string-like body, with large eyes, a red dorsal fin, elongated leading rays, and a short anal fin near the caudal fin. It grows up to 2 metres in length.

Myctophum punctatum Lanternfish typically have a slender, compressed body covered in small, silvery deciduous cycloid scales (ctenoid in four species), a large bluntly rounded head, large elliptical to round lateral eyes (dorsolateral in Protomyctophum species), and a large terminal mouth with jaws closely set with rows of small teeth. The fins are generally small, with a single high dorsal fin, a forked caudal fin, and an adipose fin. The anal fin is supported by a cartilaginous plate at its base, and originates under, or slightly behind, the rear part of the dorsal fin. The pectoral fins, usually with eight rays, may be large and well-developed to small and degenerate, or completely absent in a few species.

Liopropoma emanueli shows the angular face which is typical of its genus and has a torpedo shaped body and it can be distinguished from the other species within the genus by have an obviously split dorsal fin, the spiny part and the soft rayed part are not joined, these are joined in congeners. It is mainly orange to pink in overall colour with a single obvious, wide, yellow stripe extending from the tip of the snout over much of the body. It also has many, thin yellow horizontal, lines along its body. The dorsal fin contains 8 spines and 11 soft rays while the anal fin has 3 spines and 8 soft rays.

The silver drummer has an oval to circular when viewed from the side which is not compressed; the dorsal profile of the head is sloping between the area between the eyes and the snout with a characteristic bulging head profile. It has a continual dorsal fin which as a spiny anterior part and a soft-rayed posterior part, the spiny part being normally more than half as long again as the soft-rayed part. There are 10-11 spines and 11-12 soft rays in the dorsal fin while the anal fin has 2-3 spines and 10-12 soft rays. There is a total of 52-66 scales in the lateral line of which 42-56 are pored.

The lateral line is continuous and evenly curved. The dorsal fin is continuous, the spiny part is low and contains 11-13 spines and is arched in shape with the fifth to seventh spines being the longest although the longest dorsal spine is shorter than the longest dorsal soft ray, the soft-rayed part of the dorsal fin is rounded and contains 13-14 soft rays. All 3 anal spines are short, robust and curved with the first one being half as long as second soft anal rounded with the third being slightly shorter than the second. The anal fin soft rays are all longer than the spines and there are 11-12 of them.

The Zacapu shiner is differentiated from the other members of the N. calientis species complex by having 6, rarely 7, branched rays in the anal fin and 8 pelvic fin rays and by normally having 42 lateral line scales. It has a yellowish to light brown body with a dark lateral stripe which widens to form a slightly convex part from near the pectoral fin origin to the dorsal fin origin, becoming narrower and darker towards the rear. There is a dark marking on the caudal peduncle and at the origin of the caudal fin. There are fine markings around the base of the dorsal fin and the head is pigmented, the fins are unpigmented.

The yellow Shiner is a small fish with a deep, broad body which is at its deepest just in front of the origin of the dorsal fin and which has an extended caudal peduncle which is twice as long as it is deep. It has a brown back with a silver belly, the difference between the two being quite marked, although there is a subtle dark band running from the snout to the caudal peduncle which is darker at its ends. The females have deeper bodies and are darker than the males. It has a whitish chin and the caudal fin and dorsal fin are dusky in color while the other fins are lighter.

A female black phantom tetra identified by its reddish pelvic, anal and adipose fins The male black phantom tetras have longer fins than the females and when in breeding condition, the females become plumper, but the biggest difference is in their color. The males have no red, while the smaller fins of the female both on the top and underneath them are red. The adipose fin, on the top of the body behind the larger dorsal fin, is much more noticeable in the females than the males, because in females it is red while in the males it is grey. The female's dorsal fin has a more intense black than the male's.

The anal fin has three spines and seven soft rays. The caudal fin is rounded. The colour of the head and body is white to pink to reddish with a ref iris and the dorsal part of the head and nape being red. There is a white band which runs along the middle of the head starting at the top lip and ending at the 2nd spine in the dorsal fin and another wide red bar which runs from the soft rayed portion of the dorsal fin vertically on the body onto the anal fin> The anal and dorsal fins have white edges, the pelvic fins are white while the caudal fin is red with a white posterior margin.

MaleWild ram cichlids are often more colorful than the tank-bred fish, which suffer from poor breeding and also being injected with hormones for more color, although this makes as many as one in four males infertile. Male specimens of the ram usually have the first few rays of the dorsal fin extended, but breeding has made some females also show this. When close to spawning, female rams have a pink or red blush on the abdomen. Females also have a blue sheen over the spot just below the dorsal fin, or a sparse scattering of blue scales in the upper half of the dark spot, and males do not show this.

The sailfin dottyback (Oxycercichthys veliferus), also known as the longtail dottyback, is a species of ray-finned fish from the family Pseudochromidae, the dottybacks from the Western Central Pacific where it is found on the Great Barrier Reef and other coral reefs in the Coral Sea, where it is occurs inshore near rock and coral formations where there are sandy bottoms. This fish occasionally makes its way into the aquarium trade. It grows to a size of in length. It is pale greyish to yellowish in colour and has bluish upperparts, a bluish dorsal fin which fades to yellow posteriorly and it has a dark blue spot at the anterior end of the dorsal fin.

Collapsed or collapsing dorsal fins are rare in most wild populations and usually result from a serious injury to the fin, such as from being shot or colliding with a vessel. After exposure to the 1989 Exxon Valdez oil spill, two male resident killer whales experienced dorsal fin collapse, and the animals subsequently died. In 2002, the dorsal fin of a stranded killer whale showed signs of collapse after three days but regained its natural upright appearance as soon as the orca resumed strong normal swimming upon release. A study in 1998 recorded that 7 out of 30 (23%) adult male killer whales off the coast of New Zealand had abnormal dorsal fins.

Mycteroperca xenarcha has an elongated, robust and compressed body which has its depth at the origin of the dorsal fin is not any greater than the depth at the origin of the anal fin. The snout is much longer than the eye with the lower jaw projecting beyond the upper and with canine-like teeth at front of the jaws. The preopercle corner angle strongly serrated and there are29-33 gill rakers. The dorsal fin has 11 spines and 16-17 soft rayes with spines 2-7 being the same length; the anal fin has 2 pines and 10-11 rats, the pectoral fin has 16-18 rays, although most specimens have 17.

Merluccius australis has a more slender body compared to other species of Merluccius, with a short head which is makes up around a quarter of its standard length and a protruding lower jaw with some visible teeth. The anterior dorsal fin has a single spine and 9 to 12 fin rays and the posterior dorsal fin has 39 to 45 fin rays. The anal fin has 40 to 46 fin rays and the pectoral fins are long and thin, but they do not reach as far as the origin of anal fin in specimens longer than 50 cm standard length. The caudal fin margin is normally truncate, but in smaller specimens it can be slightly emarginate.

Fraser's dolphins are about long and weight at birth, growing to and at adulthood. They have a stocky build, a small fin in relation to the size of the body, conspicuously small flippers. The dorsal fin and beak are also insubstantial. The upper side is a gray-blue to gray-brown.

The body of the sailfin molly is essentially oblong. The head is small and dorsally flattened, with a small, upturned mouth. The caudal peduncle is broad and the caudal fin is large, rounded, and sometimes tipped with black. The pelvic fins originate at a point anterior to the dorsal fin.

Relatively few specimens are known so far. Mature individuals of this species reach a length of 19.1 - 21.5 cm. Both dorsal and ventral surfaces are dark brown to purplish-black, with irregular whitish blotches on the belly. Gill slits are very narrow; the second dorsal fin is slightly larger than first.

Members of Lepidoperca have moderately compressed oblong or ovate bodies. They have large eyes, with diameters longer than the distance between both eyes. The dorsal fin has ten spines and 15 to 17 soft rays. The margin has a slight notch just before it transitions into the soft-rayed portion.

The body of juvenile specimens are shades of red-brown. Normally, two white stripes will be visible with a black blotch present behind the upper gill covers. A white spot will also be present behind the dorsal fin. During both the juvenile and initial phases, colouration and markings can change quickly.

The snubnose sculpin reaches a maximum size of 10 cm. It has a blunt snout and visible scales from the top of the head to the first dorsal fin. It is spotted with colors in different shades of earthtone. It can change colors as camouflage, and the colors can vary substantially.

The dwarf hawkfish can reach in total length. The dorsal fin has ten spines with numerous tassels on the tips of the spines. The anal fin has three spines and six soft rays. The pectoral fins are thick and elongated and spread out when the fish is resting on the substrate.

Pelvic fins are also low and positioned at about the mid point of the body. Anal fin medium sized with the dorsal fin base about 90 percent that of the anal fin. Tail fin of medium length with well developed flanges commonly extending as far forward as the anal fin.

The pectoral fins have 21 to 24 rays, all of which are rigid. The anal fin has 11 to 14 rays with no spines. It is about the same size as the second dorsal fin. The caudal fin is rounded with about 17 rays, 12 of which are segmented and branched.

Southern saratoga can grow up to 90 cm (4 kg). At sexual maturity they are usually 48–49 cm in length. They are primitive, surface-dwelling fish with strongly compressed bodies. They have an almost perfectly flat back, with a dorsal fin set back towards the tail of their long bodies.

89 pp. They can be identified from other common minnow species by the black "moustache" on their upper lips, along with a black dot on their dorsal fins. Additionally, juvenile males develop a rosy band on their sides, along with glossy, dark dorsal fin spots.Etnier, D.A., and W.C. Starnes. 1993.

Retrieved 2008-SEP-01. It grows to a maximum of 20 cm (almost 8 in) long. The body is yellow with a black patch surrounded by a blue circle below the dorsal fin and two curved blue lines above the belly. Its vertical black eyestripe is flanked by two blue lines.

The top edge of the opercular cover is only slightly convex and the posterior edge curves at an acute angle. The head, body and dorsal fin are dark brownish-grey, spotted with large white blotches. In large adults, over about , the white patches tend to merge into wavy bands or mottling.

Younger fish stay closer to the shallows, but the more mature fish can be found up to deep. Majestic angelfish eat mainly sponges and tunicates. Juvenile fish are mostly blue in color with white stripes. As they mature, they take on a yellow coloration on the flanks, dorsal fin, and tail.

The second common name is because its first dorsal fin is made up of long, filamentous rays. The pelvic fin is long, thin, and scythe-like, and it has a pronounced chin barbel. The colour is grey-brown with a faint red tint on the body and black-edged median fins.

The Florida blenny is a small fish growing to a maximum length of but a more typical length is . The single, continuous dorsal fin has about six spines and nineteen soft rays. The anal fin has eighteen or nineteen rays. The colour of this fish is a mottled or speckled brown.

Porichthyinae is a subfamily of toadfish in the family Batrachoididae. They are found in the eastern Pacific Ocean and western Atlantic from Canada to Argentina. The species of this subfamily have no venom glands or subopercular spines, they have canine like teeth and two solid spines in the dorsal fin.

Thalassophryninae is a subfamily of toadfish in the family Batrachoididae. The species in the subfamily are characterised by the possession of two dorsal fin spines, a lack of subopercular spines, with the dorsal and opercular spines being hollow and have venom glands at their base. They do not have canine teeth.

Johanson & Ahlberg (1997), in their assessment of new sarcopterygian material, present such conclusions proposing Eusthenodon likely possessed the same trifurcate or diamond-shaped caudal fin with an axial lobe turned slightly dorsally known in other tristichopterids (referred to as eusthenopterids by Johanson) along with a triangular-shaped first dorsal fin.

Akmonistion is an extinct genus of holocephalian that lived in the Early Carboniferous. The genus contains a single species, A. zangerli. It is distinguished by an unusual enlarged formation of the dorsal fin, called a "spine-brush complex", of unknown function. This is also found in the better known genus Stethacanthus.

A Tecopa pupfish The fish were about 1–1.5 inches (2.5–4 cm) in length. The dorsal fin was positioned closer to the tail than the head. The pelvic fin was small or sometimes absent, and had six lepidotrichia. Similar to some other Cyprinodons, breeding males displayed a bright blue coloration.