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Lake trout

February 15, 2024

"Togue" redirects here. For the culinary vegetable, see Mung bean sprout. For Lakes named "Trout", see Trout Lake. For other uses, see Lake trout (disambiguation).

The lake trout (Salvelinus namaycush)[2] 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. Those caught with dark coloration may be called mud hens.[3]

Lake trout

Secure (NatureServe)
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Salmoniformes
Family: Salmonidae
Genus: Salvelinus
Subgenus: Cristovomer
Walbaum, 1792
Species:
S. namaycush
Binomial name
Salvelinus namaycush
(Walbaum, 1792)[1]

Taxonomy edit

It is the only member of the subgenus Cristovomer, which is more derived than the subgenus Baione (the most basal clade of Salvelinus, containing the brook trout (S. fontinalis) and silver trout (S. agasizii)) but still basal to the other members of Salvelinus.[4]

Range edit

From a zoogeographical perspective, lake trout have a relatively narrow distribution. They are native only to the northern parts of North America, principally Canada, but also Alaska and, to some extent, the northeastern United States.[5] Lake trout have been widely introduced into non-native waters in North America[6] and into many other parts of the world, mainly Europe, but also into South America and certain parts of Asia. Although lake trout were introduced into Yellowstone National Park's Shoshone, Lewis and Heart lakes legally in the 1890s, they were illegally or accidentally introduced into Yellowstone Lake in the 1980s where they are now considered invasive.[7]

Description edit

 
A lake trout

Lake trout are the largest of the chars; the record weighed almost 102 pounds (46 kg) (netted) with a length of 50 inches (130 cm), and 15–40-pound (6.8–18.1-kilogram) fish are not uncommon. The average length is 24–36 inches (61–91 centimetres). The largest caught on a rod and reel according to the IGFA was 72 pounds (33 kg), caught in Great Bear Lake in 1995 with a length of 59 inches (150 cm).[8]

Life history edit

Lake trout inhabit cold, oxygen-rich waters. They are pelagic during the period of summer stratification in dimictic lakes, often living at depths of 20–60 m (66–197 ft).

The lake trout is a slow-growing fish, typical of oligotrophic waters. It is also very late to mature. Populations are extremely susceptible to overfishing. Many native lake trout populations have been severely damaged through the combined effects of hatchery stocking (planting) and over harvest. Another threat to lake trout is acidification, which can have longterm effects on their populations through both direct harm and reduced prey populations (e.g. Mysis relicta).[9]

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.[10] In these lakes, lake trout act as planktivores. Lake trout in planktivorous populations are highly abundant, grow very slowly and mature at relatively small sizes. In those lakes that do contain deep-water forage, lake trout become piscivorous. Piscivorous lake trout grow much more quickly, mature at a larger size and are less abundant. Notwithstanding differences in abundance, the density of biomass of lake trout is fairly consistent in similar lakes, regardless of whether the lake trout populations they contain are planktivorous or piscivorous.[citation needed]

 
A lake trout in spawning dress.

In Lake Superior, common lake trout (S. n. namaycush) and siscowet lake trout (S. n. siscowet) live together. Common lake trout tend to stay in shallower waters, while siscowet lake trout stay in deeper water. Common lake trout (also called "lean" lake trout) are slimmer than the relatively fat siscowet. Siscowet numbers have become greatly depressed over the years due to a combination of the extirpation of some of the fish's deep water coregonine prey and to overexploitation. Siscowet tend to grow extremely large and fat and attracted great commercial interest in the last century. Their populations have rebounded since 1970, with one estimate putting the number in Lake Superior at 100 million. Professor of Zoology at the University of Wisconsin-Madison James Kitchell credits effective constraint of commercial fisheries and persistent sea lamprey (Petromyzon marinus) control for the successful recovery of Lake Superior's lake trout. "Looking at what has happened in the lake and the results of computer simulations, it is clear that lamprey control needs to continue if Lake Superior is to keep its lake trout."[11]

Hybrids edit

Lake trout are known to hybridize in nature with the brook trout; such hybrids, known as "splake", are normally sterile but self-sustaining populations exist in some lakes.[12] Splake are also artificially propagated in hatcheries, and then stocked into lakes in an effort to provide sport-fishing opportunities.[13]

Commercial fishing edit

 
Fishermen drying a net and hauling lake trout; part of a 1940 mural in the Sturgeon Bay Post Office.

Lake trout were fished commercially in the Great Lakes until lampreys, overharvest and pollution extirpated or severely reduced the stocks. Commercial fisheries still exist in some areas of the Great Lakes and smaller lakes in northern Canada. Commercial fishing by Ojibwe for Lake Trout in Lake Superior is permitted under various treaties and regulated by the Great Lakes Indian Fish & Wildlife Commission (GLIFWC).[14]

Origin of name edit

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.[15] Similar cognate words are found in Ojibwe: namegos = "lake trout"; namegoshens = "rainbow trout", literally meaning "little lake trout".[16]

Popular culture edit

Geneva, New York claims the title "Lake Trout Capital of the World," and holds an annual lake trout fishing derby.[17]

References edit

  1. ^ "Salvelinus namaycush". Integrated Taxonomic Information System. Retrieved 23 November 2013.
  2. ^ "Lake Trout (Mackinaw)". NDOW. Retrieved 2023-05-19.
  3. ^ "Mud Hens??". Lake Ontario United - Lake Ontario's Largest Fishing & Hunting Community - New York and Ontario Canada. 9 July 2023.
  4. ^ Phillips, RUTH B.; Oakley, TODD H. (1997-01-01), Kocher, Thomas D.; Stepien, Carol A. (eds.), "CHAPTER 10 - Phylogenetic Relationships among the Salmoninae Based on Nuclear and Mitochondrial DNA Sequences", Molecular Systematics of Fishes, San Diego: Academic Press, pp. 145–162, ISBN 978-0-12-417540-2, retrieved 2021-02-13
  5. ^ "Salvelinus namaycush Lake trout". Animal Diversity Web. Retrieved 2013-11-23.
  6. ^ "NAS - Nonindigenous Aquatic Species Lake Trout". US Geological Survey. Retrieved 2013-11-23.
  7. ^ Munro, Andrew R.; Thomas E. McMahon; James R. Ruzycki (Spring 2006). "Source and Date of Lake Trout Introduction" (PDF). Yellowstone Science. 14 (2).
  8. ^ "International Game Fish Association-Lake Trout". International Game Fish Association. Retrieved 2013-11-23.
  9. ^ Ogden, Lesley Evans (2018-11-01). "Acid Rain: Researchers Addressing Its Lingering Effects". BioScience. 68 (11): 928. doi:10.1093/biosci/biy113. ISSN 0006-3568.
  10. ^ Rochard, Eric; Elie, Pierre (1994). "La macrofaune aquatique de l'estuaire de la Gironde : contribution au livre blanc de l'Agence de l'eau Adour Garonne". Retrieved 24 November 2023. {{cite journal}}: Cite journal requires |journal= (help)
  11. ^ Moen, Sharon (December 2002). "Siscowet Trout: A Plague of Riches". Minnesota Sea Grant. Retrieved 20 December 2007.
  12. ^ Berst, A. H.; Ihssen, P. E.; Spangler, G. R.; Ayles, G. B.; Martin, G. W. (1980). "The splake, a hybrid charr Salvelinus namaycush x S. fontinalis.". In Balon, E. K. (ed.). Charrs, Salmonid Fishes of the Genus Salvelinus. The Hague: Dr. W. Junk Publishers. pp. 841–887.
  13. ^ "Why Splake?". Maine.gov Department of Inland Fisheries and Wildlife. Retrieved 2013-11-23.
  14. ^ "Lake Superior Treaty Fishery". Great Lakes Indian Fish & Wildlife Commission. Retrieved 2013-11-24.
  15. ^ Berkes, Fikret and Marguerite MacKenzie. "Cree Fish Names from Eastern James Bay, Quebec" in Arctic, Vol. 31, No. 4 (December 1978), pp. 489-495
  16. ^ Weshki-ayaad, Lippert and Gambill. Freelang Ojibwe Dictionary Online. Accessed September 21, 2010.
  17. ^ Lake trout derby, Geneva, NY Accessed September 29, 2010.

External links edit

  • Fishbase description of Lake trout

February 15, 2024
lake, trout, togue, redirects, here, culinary, vegetable, mung, bean, sprout, lakes, named, trout, trout, lake, other, uses, disambiguation, lake, trout, salvelinus, namaycush, freshwater, char, living, mainly, lakes, northern, north, america, other, names, in. Togue redirects here For the culinary vegetable see Mung bean sprout For Lakes named Trout see Trout Lake For other uses see Lake trout disambiguation The lake trout Salvelinus namaycush 2 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 Those caught with dark coloration may be called mud hens 3 Lake troutConservation statusSecure NatureServe Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass ActinopterygiiOrder SalmoniformesFamily SalmonidaeGenus SalvelinusSubgenus CristovomerWalbaum 1792Species S namaycushBinomial nameSalvelinus namaycush Walbaum 1792 1 Contents 1 Taxonomy 2 Range 3 Description 4 Life history 5 Hybrids 6 Commercial fishing 7 Origin of name 8 Popular culture 9 References 10 External linksTaxonomy editIt is the only member of the subgenus Cristovomer which is more derived than the subgenus Baione the most basal clade of Salvelinus containing the brook trout S fontinalis and silver trout S agasizii but still basal to the other members of Salvelinus 4 Range editFrom a zoogeographical perspective lake trout have a relatively narrow distribution They are native only to the northern parts of North America principally Canada but also Alaska and to some extent the northeastern United States 5 Lake trout have been widely introduced into non native waters in North America 6 and into many other parts of the world mainly Europe but also into South America and certain parts of Asia Although lake trout were introduced into Yellowstone National Park s Shoshone Lewis and Heart lakes legally in the 1890s they were illegally or accidentally introduced into Yellowstone Lake in the 1980s where they are now considered invasive 7 Description edit nbsp A lake troutLake trout are the largest of the chars the record weighed almost 102 pounds 46 kg netted with a length of 50 inches 130 cm and 15 40 pound 6 8 18 1 kilogram fish are not uncommon The average length is 24 36 inches 61 91 centimetres The largest caught on a rod and reel according to the IGFA was 72 pounds 33 kg caught in Great Bear Lake in 1995 with a length of 59 inches 150 cm 8 Life history editLake trout inhabit cold oxygen rich waters They are pelagic during the period of summer stratification in dimictic lakes often living at depths of 20 60 m 66 197 ft The lake trout is a slow growing fish typical of oligotrophic waters It is also very late to mature Populations are extremely susceptible to overfishing Many native lake trout populations have been severely damaged through the combined effects of hatchery stocking planting and over harvest Another threat to lake trout is acidification which can have longterm effects on their populations through both direct harm and reduced prey populations e g Mysis relicta 9 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 10 In these lakes lake trout act as planktivores Lake trout in planktivorous populations are highly abundant grow very slowly and mature at relatively small sizes In those lakes that do contain deep water forage lake trout become piscivorous Piscivorous lake trout grow much more quickly mature at a larger size and are less abundant Notwithstanding differences in abundance the density of biomass of lake trout is fairly consistent in similar lakes regardless of whether the lake trout populations they contain are planktivorous or piscivorous citation needed nbsp A lake trout in spawning dress In Lake Superior common lake trout S n namaycush and siscowet lake trout S n siscowet live together Common lake trout tend to stay in shallower waters while siscowet lake trout stay in deeper water Common lake trout also called lean lake trout are slimmer than the relatively fat siscowet Siscowet numbers have become greatly depressed over the years due to a combination of the extirpation of some of the fish s deep water coregonine prey and to overexploitation Siscowet tend to grow extremely large and fat and attracted great commercial interest in the last century Their populations have rebounded since 1970 with one estimate putting the number in Lake Superior at 100 million Professor of Zoology at the University of Wisconsin Madison James Kitchell credits effective constraint of commercial fisheries and persistent sea lamprey Petromyzon marinus control for the successful recovery of Lake Superior s lake trout Looking at what has happened in the lake and the results of computer simulations it is clear that lamprey control needs to continue if Lake Superior is to keep its lake trout 11 Hybrids editLake trout are known to hybridize in nature with the brook trout such hybrids known as splake are normally sterile but self sustaining populations exist in some lakes 12 Splake are also artificially propagated in hatcheries and then stocked into lakes in an effort to provide sport fishing opportunities 13 Commercial fishing edit nbsp Fishermen drying a net and hauling lake trout part of a 1940 mural in the Sturgeon Bay Post Office Lake trout were fished commercially in the Great Lakes until lampreys overharvest and pollution extirpated or severely reduced the stocks Commercial fisheries still exist in some areas of the Great Lakes and smaller lakes in northern Canada Commercial fishing by Ojibwe for Lake Trout in Lake Superior is permitted under various treaties and regulated by the Great Lakes Indian Fish amp Wildlife Commission GLIFWC 14 Origin of name editThe 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 kukamas h kukamaw and kukamesh 15 Similar cognate words are found in Ojibwe namegos lake trout namegoshens rainbow trout literally meaning little lake trout 16 Popular culture editGeneva New York claims the title Lake Trout Capital of the World and holds an annual lake trout fishing derby 17 References edit Salvelinus namaycush Integrated Taxonomic Information System Retrieved 23 November 2013 Lake Trout Mackinaw NDOW Retrieved 2023 05 19 Mud Hens Lake Ontario United Lake Ontario s Largest Fishing amp Hunting Community New York and Ontario Canada 9 July 2023 Phillips RUTH B Oakley TODD H 1997 01 01 Kocher Thomas D Stepien Carol A eds CHAPTER 10 Phylogenetic Relationships among the Salmoninae Based on Nuclear and Mitochondrial DNA Sequences Molecular Systematics of Fishes San Diego Academic Press pp 145 162 ISBN 978 0 12 417540 2 retrieved 2021 02 13 Salvelinus namaycush Lake trout Animal Diversity Web Retrieved 2013 11 23 NAS Nonindigenous Aquatic Species Lake Trout US Geological Survey Retrieved 2013 11 23 Munro Andrew R Thomas E McMahon James R Ruzycki Spring 2006 Source and Date of Lake Trout Introduction PDF Yellowstone Science 14 2 International Game Fish Association Lake Trout International Game Fish Association Retrieved 2013 11 23 Ogden Lesley Evans 2018 11 01 Acid Rain Researchers Addressing Its Lingering Effects BioScience 68 11 928 doi 10 1093 biosci biy113 ISSN 0006 3568 Rochard Eric Elie Pierre 1994 La macrofaune aquatique de l estuaire de la Gironde contribution au livre blanc de l Agence de l eau Adour Garonne Retrieved 24 November 2023 a href Template Cite journal html title Template Cite journal cite journal a Cite journal requires journal help Moen Sharon December 2002 Siscowet Trout A Plague of Riches Minnesota Sea Grant Retrieved 20 December 2007 Berst A H Ihssen P E Spangler G R Ayles G B Martin G W 1980 The splake a hybrid charr Salvelinus namaycush x S fontinalis In Balon E K ed Charrs Salmonid Fishes of the Genus Salvelinus The Hague Dr W Junk Publishers pp 841 887 Why Splake Maine gov Department of Inland Fisheries and Wildlife Retrieved 2013 11 23 Lake Superior Treaty Fishery Great Lakes Indian Fish amp Wildlife Commission Retrieved 2013 11 24 Berkes Fikret and Marguerite MacKenzie Cree Fish Names from Eastern James Bay Quebec in Arctic Vol 31 No 4 December 1978 pp 489 495 Weshki ayaad Lippert and Gambill Freelang Ojibwe Dictionary Online Accessed September 21 2010 Lake trout derby Geneva NY Accessed September 29 2010 External links editFishbase description of Lake trout Retrieved from https en wikipedia org w index php title Lake trout amp oldid 1200155184, wikipedia, wiki, book, books, library,

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