Bering cisco: Difference between revisions
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== Ecology == |
== Ecology == |
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The Bering cisco is usually found in river mouths, brackish lagoons, and coastal waters, but may penetrate far upstream.<ref name="Alaska"/><ref name="base"/> Most populations are [[anadromous]], migrating as far as {{convert|2100|km|mi}} inland to spawn during the late summer.<ref name="Alaska"/><ref name="Yukon">{{cite web|url=http://www.taiga.net/yourYukon/col445.html|title=Unsung Bering cisco deserve more respect|work=yourYukon|author=Friis-Baastad, Erling|date=21 October 2005|accessdate=22 March 2010}}</ref> In most of its range, the Bering cisco is abundant. Its habitats are mostly remote and pristine, and it has no known threats.<ref name="Alaska"/> In rivers, it may be the most abundant migratory fish.<ref name="Yukon"/> In estuaries, the Bering cisco is an important "cornerstone species", serving as an important source of food for larger animals.<ref name="Yukon"/> The Bering cisco is taken commercially, and sold as "white trout".<ref>{{cite web|url=http://www.adfg.state.ak.us/pubs/notebook/fish/whitfish.php|title=Whitefish Species|publisher=Alaska Department of Fish and Game|author=Alt, Kenneth|accessdate=22 March 2010}}</ref> In New York, smoked Bering ciscoes are popular, and are esteemed for their creamy flesh. They are sold instead of the usual holiday food of Great Lakes whitefishes.<ref>{{cite news|url=http://www.nytimes.com/2008/12/17/dining/17fish.html|author=Fabricant, Florence|date=16 December 2008|newspaper=The New York Times|accessdate=22 March 2010}}</ref> Subsistence fishermen also take the Bering cisco in small numbers,<ref name="Alaska"/> as do commercial fishermen fishing for salmon during its migration.<ref name="Yukon"/> |
The Bering cisco is usually found in river mouths, brackish lagoons, and coastal waters, but may penetrate far upstream.<ref name="Alaska"/><ref name="base"/> Most populations are [[anadromous]], migrating as far as {{convert|2100|km|mi}} inland to spawn during the late summer.<ref name="Alaska"/><ref name="Yukon">{{cite web|url=http://www.taiga.net/yourYukon/col445.html|title=Unsung Bering cisco deserve more respect|work=yourYukon|author=Friis-Baastad, Erling|date=21 October 2005|accessdate=22 March 2010}}</ref> In most of its range, the Bering cisco is abundant. Its habitats are mostly remote and pristine, and it has no known threats.<ref name="Alaska"/> In rivers, it may be the most abundant migratory fish.<ref name="Yukon"/> In estuaries, the Bering cisco is an important "cornerstone species", serving as an important source of food for larger animals.<ref name="Yukon"/> The Bering cisco is taken commercially, and sold as "white trout".<ref>{{cite web|url=http://www.adfg.state.ak.us/pubs/notebook/fish/whitfish.php|title=Whitefish Species|publisher=Alaska Department of Fish and Game|author=Alt, Kenneth|accessdate=22 March 2010}}</ref> In New York, smoked Bering ciscoes are popular, and are esteemed for their creamy flesh. They are sold instead of the usual holiday food of Great Lakes whitefishes.<ref>{{cite news|url=http://www.nytimes.com/2008/12/17/dining/17fish.html|author=Fabricant, Florence|date=16 December 2008|newspaper=The New York Times|accessdate=22 March 2010|title=Alaskan Catch for the Holiday Table}}</ref> Subsistence fishermen also take the Bering cisco in small numbers,<ref name="Alaska"/> as do commercial fishermen fishing for salmon during its migration.<ref name="Yukon"/> |
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The Bering cisco feeds on [[amphipod]]s and other invertebrates and small fish such as [[sculpin]]s. It migrates to clear and shallow streams in the late summer, not feeding during migration.<ref name="Alaska"/> Not eating during migration is typical among [[salmon]], but rare in whitefishes.<ref>Reist, J. D.; R. A. Bodaly, R. J. P. Fudge, K. J. Cash, and T. V. Stevens (1987). "External scarring of whitefish, Coregonus nasus and C. clupeaformis complex, from the western Northwest Territories, Canada". ''Canadian Journal of Zoology'' '''65'''(5): 1230–1239. {{doi|10.1139/z87-191}}.</ref> Spawning occurs in clear, cool streams with 1 to 3 inch gravel.<ref name="Alaska"/> A year after hatching, young ciscoes drift downstream to estuaries. The Bering cisco becomes sexually mature when it is four to nine years old.<ref name="Yukon"/> |
The Bering cisco feeds on [[amphipod]]s and other invertebrates and small fish such as [[sculpin]]s. It migrates to clear and shallow streams in the late summer, not feeding during migration.<ref name="Alaska"/> Not eating during migration is typical among [[salmon]], but rare in whitefishes.<ref>Reist, J. D.; R. A. Bodaly, R. J. P. Fudge, K. J. Cash, and T. V. Stevens (1987). "External scarring of whitefish, Coregonus nasus and C. clupeaformis complex, from the western Northwest Territories, Canada". ''Canadian Journal of Zoology'' '''65'''(5): 1230–1239. {{doi|10.1139/z87-191}}.</ref> Spawning occurs in clear, cool streams with 1 to 3 inch gravel.<ref name="Alaska"/> A year after hatching, young ciscoes drift downstream to estuaries. The Bering cisco becomes sexually mature when it is four to nine years old.<ref name="Yukon"/> |
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Revision as of 14:18, 23 March 2010
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| Illustration from The Natural History of Useful Aquatic Animals | |
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| Species: | C. laurettae
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| Coregonus laurettae Bean, 1881
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Argyrosomus alascanus Scofield, 1898 | |
The Bering cisco or Lauretta whitefish is a freshwater whitefish found in Alaska and part of Russia. It is often considered to be the same species as the more common Arctic cisco.[1]
Description
The Bering cisco has an elongate, compressed body. It is silvery-coloured, with a brownish or greenish back. Its pelvic and pectoral fins are almost clear, and its other fins are spotted white. It is distinguished from the Arctic cisco by its smaller number of gill rakers.[1][2] It reaches a maximum length of 48 centimetres (19 in).[2]
Distribution
The Bering cisco is found in Alaska from Cook Inlet on the south coast to Oliktok Point on the Arctic coast. It occurs on the Yukon River as far upstream as Dawson City, on the Porcupine River, and in the lakes of the Brooks Range. There are some reports of Bering ciscoes from the Chukchi Peninsula and the Kamchatka Peninsula, these presumably being migrants from Alaska.[1][2]
Ecology
The Bering cisco is usually found in river mouths, brackish lagoons, and coastal waters, but may penetrate far upstream.[1][2] Most populations are anadromous, migrating as far as 2,100 kilometres (1,300 mi) inland to spawn during the late summer.[1][3] In most of its range, the Bering cisco is abundant. Its habitats are mostly remote and pristine, and it has no known threats.[1] In rivers, it may be the most abundant migratory fish.[3] In estuaries, the Bering cisco is an important "cornerstone species", serving as an important source of food for larger animals.[3] The Bering cisco is taken commercially, and sold as "white trout".[4] In New York, smoked Bering ciscoes are popular, and are esteemed for their creamy flesh. They are sold instead of the usual holiday food of Great Lakes whitefishes.[5] Subsistence fishermen also take the Bering cisco in small numbers,[1] as do commercial fishermen fishing for salmon during its migration.[3]
The Bering cisco feeds on amphipods and other invertebrates and small fish such as sculpins. It migrates to clear and shallow streams in the late summer, not feeding during migration.[1] Not eating during migration is typical among salmon, but rare in whitefishes.[6] Spawning occurs in clear, cool streams with 1 to 3 inch gravel.[1] A year after hatching, young ciscoes drift downstream to estuaries. The Bering cisco becomes sexually mature when it is four to nine years old.[3]
References
- ^ a b c d e f g h i "Bering Cisco" (PDF). Alaska Natural Heritage Program. 23 March 2005. Retrieved 22 March 2010.
- ^ a b c d Froese, Rainer; Pauly, Daniel (eds.). "Coregonus laurettae". FishBase. March 2010 version.
- ^ a b c d e Friis-Baastad, Erling (21 October 2005). "Unsung Bering cisco deserve more respect". yourYukon. Retrieved 22 March 2010.
- ^ Alt, Kenneth. "Whitefish Species". Alaska Department of Fish and Game. Retrieved 22 March 2010.
- ^ Fabricant, Florence (16 December 2008). "Alaskan Catch for the Holiday Table". The New York Times. Retrieved 22 March 2010.
- ^ Reist, J. D.; R. A. Bodaly, R. J. P. Fudge, K. J. Cash, and T. V. Stevens (1987). "External scarring of whitefish, Coregonus nasus and C. clupeaformis complex, from the western Northwest Territories, Canada". Canadian Journal of Zoology 65(5): 1230–1239. doi:10.1139/z87-191.