There are three subspecies of lake trout. There is the common lake trout (Salvelinus namaycush namaycush), the siscowet lake trout (Salvelinus namaycush siscowet), and the less common rush lake trout (Salvelinus namaycush huronicus). Some lakes do not have pelagic forage fish during the period of summer stratification. In these lakes, lake trout take on a life history known as planktivory.
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Lake trout (Salvelinus namaycush) is a freshwater char living mainly in lakes in northern North America. Other names for it include mackinaw, namaycush, lake char (or charr), touladi, togue, and grey trout. In Lake Superior, it can also be variously known as siscowet, paperbelly and lean. The lake trout is prized both as a game fish and as a food fish.
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A lake trout in spawning dress. In Lake Superior, common lake trout (S. n. namaycush) and siscowet lake trout (S. n. siscowet) live together.
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Tiger trout (top 3), splake (bottom) The brook trout produces hybrids both with its congeners Salvelinus namaycush and Salvelinus alpinus, and intergeneric hybrids with Salmo trutta. The splake is an intrageneric hybrid between the brook trout and lake trout (S. namaycush). Although uncommon in nature, they are artificially propagated in substantial numbers for stocking into brook trout or lake trout habitats. Although they are fertile, back-crossing in nature is behaviorally problematic and very little natural reproduction occurs.
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CRC handbook of avian body masses. CRC Press, Boca Raton, FL. Fish are rarely taken anywhere but the snowy owl has been known to prey upon Arctic char (Salvelinus alpinus) and lake trout (Salvelinus namaycush).Bailey, A. M. (1948). Birds of Arctic Alaska.
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There are currently three subgenera in the genus Salvelinus: Baione, Cristovomer, and Salvelinus sensu stricto. Baione, the most basal clade in the genus, contains the brook trout (S. fontinalis), and the presumably extinct silver trout (S. agassizii). Cristovomer contains only the lake trout (S. namaycush).
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110 and then enters Namaycush Lake. From here, it proceeds northwards through several lakes, the last being the largest at long and wide.Struzik (2005), p. 115 The final include several uncharted rapids before the river's mouth reaches Hadley Bay, emptying into Viscount Melville Sound.
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The specific epithet namaycush derives from namekush, a form of the word used in some inland Southern East Cree communities in referring to this species of fish. Other variations found in East Cree are kûkamâs[h], kûkamâw and kûkamesh.Berkes, Fikret and Marguerite MacKenzie. "Cree Fish Names from Eastern James Bay, Quebec" in Arctic, Vol.
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Lake Trout (Salvelinus namaycush) were one of the first non-native species introduced into Yellowstone. They are also the largest fish species in the park growing to an average length of . In 1890 42,000 fingerlings were planted in Lewis Lake and Shoshone Lake at the time, barren of fish because of Lewis Falls. Sometime thereafter, they were also introduced into Heart Lake.
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Crustaceans and insect larvae are important food items. Lake trout (Salvelinus namaycush) and burbot (Lota lota) are known to feed on shortjaw cisco. Shortjaw cisco are believed to be vulnerable to the invasive sea lamprey (Petromyzon marinus,) which has presumably played a role in its decline in the Great Lakes, where expansion in the range of sea lamprey has overlapped the decline in shortjaw cisco numbers.
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In 1993 it became a ZEC (zone d'exploitation contrôlée: controlled use zone), Zec de la Rivière-Mitis, managed by the Mitis River Sport Fishing Management Corporation. There are three fishing areas, one private and the other two open to the public, with 33 pools, mostly fished with waders. The ZEC de la rivière Mitis covers about of the river. Lake Mitis has a large population of lake trout (Salvelinus namaycush).
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It is slender-bodied and silvery with pinkish iridescence on its sides. Diet is predominantly zooplankton and insect larvae, although fish eggs and larvae, including those of their own species are also documented. Small fish, including some minnow species, are also known to be consumed at times. Northern cisco are preyed upon by a wide variety of predatory species, and have a particularly important place in the diet of lake trout (Salvelinus namaycush).
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The spottail shiner obtains much of its food by scavenging on the floor of the river, lakes, and streams that it occupies. Given the small size of spottail shiners, many different species of fish prey upon them. Some predators include rainbow trout, coho salmon, chinook salmon, northern pike, walleye, brown trout, lake trout (Salvelinus namaycush), and bluefish (Pomatomus saltatrix). The spottail shiner mainly competes with species that have the same diet and live in the areas.
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The brook trout, the aurora trout, and the (extinct) silver trout all have physical characteristics and colorations that distinguish them, yet genetic analysis shows that they are one species, Salvelinus fontinalis. Lake trout (Salvelinus namaycush), like brook trout, belong to the char genus. Lake trout inhabit many of the larger lakes in North America, and live much longer than rainbow trout, which have an average maximum lifespan of 7 years. Lake trout can live many decades, and can grow to more than .
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Caples lake also supports a few non-stocked species such as the Lahontan redsides (Richardsonius egregius), the tui chub (Gila bicolor), and the lake trout (Salvelinus namaycush). There is year-round fishing at Caples lake, boat access in the summer and ice-fishing in the winter. There are also many trailheads located nearby Caples Lake that enter into the Mokelumne Wilderness. The names of the trailheads are lake margaret trailhead, meiss lake trailhead, thunder mountain trailhead, frog lake/roundtop trailhead, shealor lake trailhead.
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Like in many rivers around Europe, there are some introduced salmonid fish species in the Neretva. Of these only grayling (Thymallus thymallus) established stable population so far, while the more harmful rainbow trout (Oncorhynchus mykiss) had lower survival rate and accordingly low population growth and small size. Brook trout (Salvelinus fontinalis) and lake trout (Salvelinus namaycush) have also recently been introduced to almost all of the Neretva basin reservoirs, but had only moderate to low success in establishing stable populations. At least for now populations of these invasive salmonids are rather weak.
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Genetically pure westslope cutthroat trout have been extirpated throughout most of their historic range due to habitat loss and introduction of non- native species. Remaining populations survive in isolated populations, mostly in headwater streams above natural downstream barriers. The introduction of rainbow and brown trout into Missouri River tributaries eliminated the westslope cutthroat trout from most of its eastern range in Montana. Introductions of non-native kokanee salmon (Oncorhynchus nerka), lake trout (Salvelinus namaycush) and lake whitefish (Coregonus clupeaformis) into Flathead Lake and the Flathead River system caused drastic declines in westslope cutthroat trout populations.
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It was also shown by Brandt and Madon in 1986 that adult lake trout (Salvalinus namaycush) could be a keystone predator species for the smelt. Hrabik et al. (1998) found evidence of competition for food between introduced rainbow smelt and native yellow perch (Perca flavescens) in Wisconsin lake habitats, and smelt may be partially responsible for the decline of Great Lakes whitefish (Coregonus spp.). The U.S. EPA stated in 2008 that they believe the smelt contributed to the extinction of the blue pike (Stizostedion vitreum glaucum) by outcompeting for food.
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Lahontan cutthroat trout currently occupy a small fraction of their historic range. The primary obstacle to their recovery is non-native salmonid predation by brook trout (Salvelinus fontinalis) on fluvial cutthroat and lake trout (Salvelinus namaycush) on lacustrine cutthroat. Also, hybridization of cutthroat with non- native rainbow trout (Oncorhynchus mykiss) continues to threaten recovery of the pure Lahontan cutthroat. In the Truckee River system, only Independence Lake has continuously harbored its historic native Lahontan cutthroat population, although precariously low spawner numbers there have recently increased along with five years of brook trout removal.
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Most of these fish populations have been significantly reduced due to the introduction of nonnative fish, Asian clam (Corbicula fluminea), and mysid shrimp. Competition from introduced fish led cutthroat trout to be completely extirpated from the lake in the early 20th century until reintroduction efforts started in 2019. Introduced fish species include lake trout (Salvelinus namaycush _),_ rainbow trout (Oncorhynchus mykiss gairdneri), sockeye salmon (Oncorhyncus nerka), brown trout (Salmo trutta), brook trout (Salvelinus fontinalis), common carp (Cyprinus carpio), golden shiner (Notemigonus crysoleucas), western mosquitofish (Gambusia affinis), bluegill (Lepomis macrochirus), black (Pomoxis nigromaculatus) and white (P. annularis) crappie, largemouth (Micropterus salmoides) and smallmouth (Micropterus dolomieu) bass, and brown bullhead (Ameiurus nebulosus).
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This enabled the trout and salmon to spawn in coldwater tributaries such as McCoy Creek. Although completion of fish ladders on the lowest five mainstem dams in 1992 allowed salmonine passage as far as Twin Branch Dam in Mishawaka, Indiana, 94% of the fish that pass are salmon and trout, as the ladders were not designed to permit passage of migrating native fish. Historically, the migrating native species included lake sturgeon (Acipenser fulvescens), bass (smallmouth and largemouth), redhorse (silver, golden, shorthead, river, and greater) (Moxostoma ssp.), walleye (Sander vitreus), lake trout (Salvelinus namaycush), lake whitefish (Coregonus clupeaformis), northern pike (Esox lucius) and American pickerel (E. americanus vermiculatus).
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Although he intended the dictionary to be used by future HBC servants to improve communication with their clients, he had no reliable way to record the Cree language since no phonetic script or scientific study of languages had yet been developed. The value of the dictionaries nowadays is that they provide a comprehensive sample of English words and phrases used in trade negotiations and everyday life at the forts. He was the first known person to bring certain Cree words into English – ne may cu sheeck (namaycush) for lake trout; shaganappi for rawhide thong; wa pis ka john (whiskey jack) for Canada jay; weywey (wavy) for Snow Goose.
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The lake's fish assemblage has been almost completely disrupted by twentieth century introductions of non-native fishes and mysis shrimp (Mysida). Introduced non-native fish species include northern pike (Esox lucius) which preys on native trout species. Kokanee salmon, the landlocked form of sockeye salmon (Oncorhynchus nerka), were introduced to the lake in 1945 and spawned successfully for 35 years until competition for forage with introduced mysis shrimp and predation from lake trout extirpated the kokanee. The rise in Mysida populations led to an increase in non-native lake trout (Salvelinus namaycush) numbers, the latter competing with bull trout and a predator of almost every native fish species in the lake.
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The lake trout (Salvelinus namaycush), Arctic grayling (Thymallus arcticus), white sucker (Catostomus commersoni), longnose sucker (Catostomus catostomus), burbot (Lota lota), lake herring (Coregonus artedi), lake whitefish, (Coregonus clupeaformis), walleye or pickerel (Sander vitreus), and northern pike (Esox lucius) are fish found in the freshwater lakes in Saskatchewan. Perch (Perca flavescens) swim alongside the northern pike, walleye, lake trout in the Mid-boreal lowland. The lake sturgeon (Acipenser fulvescens), goldeye (Hiodon alosoides), and bigmouth buffalo (Ictiobus cyprinellus) are fish species of the Saskatchewan river.Lake sturgeon (Acipenser fulvescens) Streams and ponds throughout the Saskatchewan prairies may be stocked with rainbow trout (Oncorhynchus mykiss), brook (Salvelinus fontinalis), and brown trout (Salmo trutta morpha fario and S. trutta morpha lacustris).
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The Aiguebelle National Park features 55 species of mammals from Abitibi-Témiscamingue, including the Moose (Alces alces), the North American beaver (Castor canadensis), the Gray wolf (Canis lupus), the Canada lynx (Lynx canadensis), the Muskrat (Ondatra zibethicus), the North American river otter (Lontra canadensis), the American mink (Mustela vison), the Least weasel (Mustela nivalis), the American black bear (Ursus americanus), the North American porcupine (Erethizon dorsatum), and the American marten (Martes americana). The birdlife of the park has 150 species of birds including twenty species of New World warblers. The lakes on the plains are dominated by Walleye and Northern pike. For the lakes in the Abijévis hills, there are lake trout (Salvelinus namaycush) and brook trout (Salvelinus fontinalis).
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Acidic Deposition in the Northeastern United States: Sources and Inputs, Ecosystem Effects, and Management Strategies. pp. 180-198 Lake acidification studies in the Experimental Lake Area (ELA) in northwestern Ontario clearly demonstrated the negative effects of increased acidity on a native fish species: lake trout (Salvelinus namaycush) recruitment and growth dramatically decreased due to extirpation of its key prey species during acidification.. Reactive nitrogen from agriculture, animal-raising, fertilizer, septic systems, and other sources have raised nitrate concentrations in waterways of most industrialized nations. Nitrate concentrations in 1,000 Norwegian lakes had doubled in less than a decade. Rivers in the northeastern United States and the majority of Europe have increased ten to fifteen fold over the last century.
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Lahontan cutthroat trout (Oncorhynchus clarkii henshawi) is the only trout species native to Fallen Leaf Lake, Lake Tahoe and the Truckee River Basin but were extirpated by introduction of predatory non-native lake trout (Salvelinus namaycush), other competing non-native salmonids, and overfishing. Re-introduction into Fallen Leaf Lake of the Pilot Peak strain of Lahontan cutthroat trout (LCT), established as the LCT strain native to the watershed, began in 2006. This strain grows larger than any other LCT subspecies. Although the LCT suffer from heavy predation by lake trout, interbreeding with non-native rainbow trout (Oncorhynchus mykiss), and foraging competition with non-native kokanee salmon (Oncorhynchus nerka), their population is gradually increasing in the lake.
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Mingan River near the community of Ekuanitshit Innu have long used the territory for hunting and fishing, and Europeans have been fishing for salmon since the start of the 19th century. The Pourvoirie du Lac Allard et Rivière Mingan, which does not have exclusive rights, manages fishing on part of the river. The river is known for Atlantic salmon (Salmo salar), and also has rainbow smelt (Osmerus mordax), brook trout (Salvelinus fontinalis), Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus), northern pike (Esox lucius), lake whitefish (Coregonus clupeaformis) and brown trout (Salmo trutta). Other species include round whitefish (Prosopium cylinraceum), lake trout (Salveninus namaycush), burbot (Lota lota), alewife (Alosa pseudoharengus), American shad (Alosa sapidissima), Atlantic tomcod (Microgadus tomcod) and American eel (Anguilla rostrata).
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To formally describe the species and prevent local fishermen from overharvesting in the absence of bag limits, specimens were sent to Harvard and the U.S. National Museum for identification, where the fish was first described as a form of lake trout (Salvelinus namaycush), and later as a variety of brook trout (Salvelinus fontinalis). The silver trout was described as Salmo agassizii in 1885. W.C.Kendall, who published a famous monograph on New England chars in 1914, in turn concluded that the silver trout was related to the Arctic char (Salvelinus alpinus). Re-examining the 13 silver trout specimens in the U.S. National Museum by matching the markings on the dorsal fin and tail, the numbers of vertebrae, and the array of pelvic fin rays and gillrakers between different species, Robert J. Behnke concluded that the silver trout was most closely related to the brook trout, while the divergence was still concluded to be enough to place it outside of typical S. fontinalis.
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