The Bering cisco or Lauretta whitefish (''Coregonus laurettae'') is a

freshwater whitefish The freshwater whitefish are fishes of the subfamily Coregoninae, which contains whitefishes (both freshwater and anadromous) and ciscoes, and is one of three subfamilies in the salmon family Salmonidae. Apart from the subfamily Coregoninae, th ...

found in Alaska and part of Russia. It is often considered to be the same species as the more common

Arctic cisco Arctic cisco (''Coregonus autumnalis''), also known as omul russian: Омуль, is an anadromous species of freshwater whitefish that inhabits the Arctic parts of Siberia, Alaska and Canada. It has a close freshwater relative in several lakes of ...

(''Coregonus autumnalis'').

Description

The Bering cisco has an elongate, compressed body. It is silvery-coloured, with a brownish or greenish back. Its

pelvic The pelvis (plural pelves or pelvises) is the lower part of the trunk, between the abdomen and the thighs (sometimes also called pelvic region), together with its embedded skeleton (sometimes also called bony pelvis, or pelvic skeleton). The ...

and

pectoral fin Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as ...

s are almost clear, and its other fins are spotted white. It is distinguished from the Arctic cisco by its smaller number of

gill rakers Gill rakers in fish are bony or cartilaginous processes that project from the branchial arch (gill arch) and are involved with suspension feeding tiny prey. They are not to be confused with the gill filaments that compose the fleshy part of t ...

. It reaches a maximum length of .

Distribution

The Bering cisco is found in Alaska from

Cook Inlet Cook Inlet ( tfn, Tikahtnu; Sugpiaq: ''Cungaaciq'') stretches from the Gulf of Alaska to Anchorage in south-central Alaska. Cook Inlet branches into the Knik Arm and Turnagain Arm at its northern end, almost surrounding Anchorage. On its sou ...

on the south coast to Oliktok Point on the Arctic coast. It occurs on the

Yukon River The Yukon River (Gwichʼin language, Gwich'in: ''Ųųg Han'' or ''Yuk Han'', Central Alaskan Yup'ik language, Yup'ik: ''Kuigpak'', Inupiaq language, Inupiaq: ''Kuukpak'', Deg Xinag language, Deg Xinag: ''Yeqin'', Hän language, Hän: ''Tth'echù' ...

as far upstream as

Dawson City Dawson City, officially the City of Dawson, is a town in the Canadian territory of Yukon. It is inseparably linked to the Klondike Gold Rush (1896–99). Its population was 1,577 as of the 2021 census, making it the second-largest town in Yuko ...

, on the

Porcupine River The Porcupine River (''Ch’ôonjik'' in Gwich’in) is a tributary of the Yukon River in Canada and the United States. It rises in the Ogilvie Mountains north of Dawson City, Yukon, Canada. From there it flows north through the community of ...

, and in the lakes of the

Brooks Range The Brooks Range ( Gwich'in: ''Gwazhał'') is a mountain range in far northern North America stretching some from west to east across northern Alaska into Canada's Yukon Territory. Reaching a peak elevation of on Mount Isto, the range is belie ...

. There are some reports of Bering ciscoes from the

Chukchi Peninsula The Chukchi Peninsula (also Chukotka Peninsula or Chukotski Peninsula; russian: Чуко́тский полуо́стров, ''Chukotskiy poluostrov'', short form russian: Чуко́тка, ''Chukotka''), at about 66° N 172° W, is the eastern ...

and the

Kamchatka Peninsula The Kamchatka Peninsula (russian: полуостров Камчатка, Poluostrov Kamchatka, ) is a peninsula in the Russian Far East, with an area of about . The Pacific Ocean and the Sea of Okhotsk make up the peninsula's eastern and we ...

, these presumably being migrants from Alaska.

Ecology

The Bering cisco is usually found in river mouths, brackish lagoons, and coastal waters, but may penetrate far upstream. Most populations are

anadromous Fish migration is mass relocation by fish from one area or body of water to another. Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousan ...

, migrating as far as inland to spawn during the late summer. In most of its range, the Bering cisco is abundant. Its habitats are mostly remote and pristine, and it has no known threats. In rivers, it may be the most abundant migratory fish. In estuaries, the Bering cisco is an important "

keystone species A keystone species is a species which has a disproportionately large effect on its natural environment relative to its abundance, a concept introduced in 1969 by the zoologist Robert T. Paine. Keystone species play a critical role in maintaini ...

", serving as an important source of food for larger animals. The Bering cisco is taken commercially, and sold as "white trout". 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. Subsistence fishermen also take the Bering cisco in small numbers, as do commercial fishermen fishing for salmon during its migration. The Bering cisco feeds on

amphipod Amphipoda is an order of malacostracan crustaceans with no carapace and generally with laterally compressed bodies. Amphipods range in size from and are mostly detritivores or scavengers. There are more than 9,900 amphipod species so far descr ...

s and other invertebrates and small fish such as sculpins. It migrates to clear and shallow streams in the late summer, not feeding during migration. Not eating during migration is typical among

salmon Salmon () is the common name for several list of commercially important fish species, commercially important species of euryhaline ray-finned fish from the family (biology), family Salmonidae, which are native to tributary, tributaries of the ...

, but rare in whitefishes.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. . Spawning occurs in clear, cool streams with 1 to 3 inch gravel. A year after hatching, young ciscoes drift downstream to estuaries. The Bering cisco becomes sexually mature when it is four to nine years old.

References

{{Taxonbar, from=Q3232002 Coregonus Freshwater fish of the Arctic Fish described in 1881