Siberian Sturgeon (Acipenser baerii)
Reference work entry
Siberian Sturgeon ( Acipenser baerii) – fish of the sturgeon family (Acipenseridae), includes semi-anadromous and freshwater species. S. inhabits the rivers of Siberia from the Ob to the Kolyma and further to the Indigirka. In the Irtysh, it was common to the Lake Zaysan (and the Black Irtysh), in the Ob – from the Ob-Taz Bay (from Cape Drovyanoy) up to the upper reaches of the Ob and the Katun, entered the Teletskoye Lake. In the Ob and the Yenisei, S. lives together with sterlet; in the Lena and the Kolyma, it is the only representative of the sturgeon. S. S. has blunt-nose (typical) and sharp-nosed forms. Spawning grounds in the Ob are located in the middle and upper Ob up to the confluence the Biya and the Katun, in the Katun and the Anuya. In the Yenisei River, spawning grounds are located along the Yartsevo-Vorogovo line (1,500 km from the mouth). S. S. grows slowly. Sexual maturity of males in the Ob comes at the age of 9–14 years (rarely), females – at 11–20 years (rarely 10)....
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