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). In the lower reaches of the Yenisei River, sturgeon reaches sexual maturity at 18–23 years, and males of the Baikal sturgeon mature at age of 15 and females 1 year and later. The Ob sturgeon females spawn every 3–4 years and males every 1–2 years; in the lower reaches of the Yenisei River, sturgeon spawns at least every 4 years. The maximum age of S. S. is 60 years. It feeds on crustaceans (amphipods), insect larvae (caddisflies, chironomidae), shellfish, and fish. S. S. forms a hybrid with Siberian sterlet, the so-called koster.
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