Coregonus Tugun

''Coregonus tugun'', the tugun, is a species freshwater whitefish from rivers draining to the Arctic Ocean. It is one of the several species of Siberian whitefishes, with a distribution encompassing rivers from the Ob in the west to the Yana River in the east. In the Lower Ob basin, it inhabits in all the Ural tributaries. It never enters the sea.C. tugun (Pallas, 1814) - тугун
Позвоночные животные России - Круглоротые и рыбы пресных вод России. Разработчики информационной системы и базы данны (accessed March 2016)

Tugun is a small fish, with a typical length of 11 cm and weight 20-30 g, and a maximum length 20 cm corresponding to 80 grams. It has 54-76 lateral line scales, which fall off easily. It is distinguished from other ''Coregonus'' species by a lower body that has a roundish cross-section. The life cycle is fast: most fish mature already in the second year of life. Life span is up to 6 years. Tugun feeds on planktonic crustaceans and insect larvae. Tugun itself has been a valuable food fish, but the populations have strongly declined.

The Lena tugun of Lena River drainage has sometimes been distinguished as a distinct subspecies ''Coregonus tugun lenensis'', but is not accepted in current taxonomy. ''Coregonus tugun'' is distantly related to all other whitefishes, and may have diverged both from the common whitefish complex and from the Eurasian and American ciscoes already ten million years ago.Alexis Crête-Lafrenière,Laura K. Weir, Louis Bernatchez (2012
Framing the Salmonidae Family Phylogenetic Portrait: A More Complete Picture from Increased Taxon Sampling
PLOS One DOI:10.1371/journal.pone.004666

References

tugun
Freshwater fish of Asia
Fish described in 1814

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