''Coregonus tugun'', the tugun, is a species

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 ...

from rivers draining to the

Arctic Ocean The Arctic Ocean is the smallest and shallowest of the world's five major oceans. It spans an area of approximately and is known as the coldest of all the oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, a ...

. It is one of the several species of

Siberia Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive region, geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a ...

n whitefishes, with a distribution encompassing rivers from the Ob in the west to the

Yana River The Yana ( rus, Я́на, p=ˈjanə; sah, Дьааҥы, ''Caañı'') is a river in Sakha in Russia, located between the Lena to the west and the Indigirka to the east. Course It is long, and its drainage basin covers . Including its longes ...

in the east. In the Lower Ob basin, it inhabits in all the

Ural Ural may refer to: *Ural (region), in Russia and Kazakhstan *Ural Mountains, in Russia and Kazakhstan *Ural (river), in Russia and Kazakhstan * Ual (tool), a mortar tool used by the Bodo people of India *Ural Federal District, in Russia *Ural econ ...

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 ''Coregonus lavaretus'' is a species of freshwater whitefish, in the family Salmonidae. It is the type species of its genus ''Coregonus''. There are widely different concepts about the delimitation of the species ''Coregonus lavaretus'' and abo ...

complex and from the

Eurasian Eurasia (, ) is the largest continental area on Earth, comprising all of Europe and Asia. Primarily in the Northern Hemisphere, Northern and Eastern Hemispheres, it spans from the British Isles and the Iberian Peninsula in the west to the Ja ...

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 {{Salmoniformes-stub