Tugun (Coregonus tugun)
Tugun (Coregonus tugun) – a river fish of the Clupeidae family, the Coregonus genus. The jaws are of equal length. The body is rounded in cross section; the back is wide. The number of gill rakers is 25–31. T. is not big, up to 20 cm. T. is found in the rivers of Siberia from the Ob to the Yana. It is mostly met in rivers and only occasionally in lakes. The spawning is annual, in autumn, in sandy shallow areas 1–1.5 m deep. T. matures during its second year. The fertility is 1.5–6 thousands eggs. T. feeds on crustaceans, insects falling in water, maggots, and fish eggs. Life span is up to 6 years. A commercial species fished in the Ob, the Yenisei, the Lena.