USING OF CYANOCOBALAMIN FOR INCREASING THE STURGEON DURABILITY ON THE DIFFERENT STAGES OF ONTOGENESIS
The effectiveness of cyanocobalamin application for breeders' injection and eggs' treatment is investigated. The breeders of Russian sturgeon (<i>Acipenser gьldenstдdti </i>Brandt), stellate sturgeon (<i>Acipenser stellatus </i>Pallas), starlet (<i>Acipenser ruthenus </i>Linnaeus), and also their eggs, larvae and fry have been used. The cyanocobalamin introduction to females before spawning significantly increases their piscicultural biological characteristics. The indices of female maturation are increased to 7-16 %, of egg fertilization to 10-17 %, output of free embryos - 20 %. During the cyanocobalamin processing of eggs the output of free embryos becomes higher by 18 %, survival rate of prolarvae - by 20 %, than in control. In the processed eggs there is 3-6 times less deflection in development. In 40 days the weight of fry, grown up from the processed eggs, was 14 % higher, than in control.