Shortnose cisco
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| Coregonus reighardi (Koelz, 1924) |
The shortnose cisco (Coregonus reighardi) is a species of freshwater fish in the salmon family (family Salmonidae). The species is native to the Nearctic ecozone, formerly occurring in Lakes Huron, Michigan, and Ontario in Canada and the United States. The last reported population was restricted to Georgian Bay off Lake Huron in Canada.
Reaching a maximum recorded length of 36 cm (14 in) and a maximum recorded weight of 540 g (1 lb 3 oz), the shortnose cisco is distinguished from the other whitefishes by its thicker body (nearly circular in cross-section), short head (the source of the fish's common name), and small eye.
Like many Coregonus species, the shortnose cisco is poorly understood, and little is known about its breeding or life-cycle except that it spawns in the spring at the lake bottom; the oldest specimen collected was eight years of age. The fish feeds on crustaceans, molluscs, and zooplankton.
The IUCN considers C. reighardi to be Critically Endangered on the basis of plummeting population, caused by environmental degradation. The U.S. Fish and Wildlife Service and the Province of Ontario's Ministry of Natural Resources, however, consider the species already extinct, on the basis that no specimen has been collected since 1985. The species was last confirmed present in Lake Ontario in 1964, in Lake Michigan in 1974, and in Georgian Bay in 1985. Predation by the alien sea lamprey (Petromyzon marinus), in combination with commercial overfishing, has contributed to the fish's drastic reduction in numbers and possible extirpation.
[edit] References
- Gimenez Dixon (1996). Coregonus reighardi. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Listed as Critically Endangered (CR A1ae v2.3)
- "Coregonus reighardi". FishBase. Ed. Ranier Froese and Daniel Pauly. October 2004 version. N.p.: FishBase, 2004.
- Coregonus reighardi (TSN 161947). Integrated Taxonomic Information System. Accessed on 12 December 2004.
- Division of Endangered Species. U.S. Fish and Wildlife Service. "Extinct Species List". Fort Snelling, Minn.: U.S. Fish and Wildlife Service, n.d. Accessed on 12 December 2004.
- Flowers, Jonathan. "The Shortnose Cisco (Coregonus reighardi): A Species Possibly Extinct". Canadian Biodiversity Project. Montréal: McGill University, 2000.
- Gimenez Dixon, M. "Coregonus reighardi" (ID 5376). 2004 IUCN Red List of Threatened Species. N.p.: IUCN, 2004.
- Natural Heritage Information Centre. Ministry of Natural Resources. Province of Ontario. "General Element Report: Coregonus reighardi". Updated 23 October 1997. Toronto: Queen's Printer for Ontario, 2002.
