Results of the combined application of various schemes of stimulation of caviar ovulation in sterlet producers under conditions of regulated systems

The article presents the results of studies of schemes for stimulating ovulation of sturgeon caviar duringrearing under conditions of regulated systems. Sturgeon (Acipenseridae) fish are characterized by high quality caviarand meat, and therefore are one of the main objects of cultivation in modern aquaculture. The achievement of sexualmaturity of sturgeon fish when grown in facilities with a closed water supply cycle depends on the compliance withtemperature and oxygen conditions, as well as species and the general physiological state of the fish itself. In modernaquaculture of sturgeon fish, the main species of cultivation are the following: beluga (Huso huso), Russian sturgeon(Acipenser gueldenstaedtii), Siberian sturgeon (Acipenser baerii), sterlet (Acipenser ruthenus) and their hybrids. Sterlet(Acipenser ruthenus) in comparison with other species of sturgeon fish reaches puberty at a much earlier date. Thestudies were carried out on the basis of LLP “Educational and Scientific Complex of Pilot Industrial Production ofAquaculture”. As it is known, pituitary injections and synthetic drugs activating the pituitary gland of sturgeons areused to stimulate producers. The study used sexually mature sterlet (Acipenser ruthenus) injected according to thecombined stimulation schemes for carp pituitary gland and synthetic preparations “Surfagon”, “Nerestin-5”. To determinethe effectiveness of using combined stimulation schemes for carp pituitary gland and synthetic preparations “Surfagon”,“Nerestin-5”, sterlet producers (Acipenser ruthenus) were divided into 3 groups of 20 individuals. As a result of thestudies, the following fish-breeding and biological indicators of sterlet producers (Acipenser ruthenus) have beendetermined: weight of fish, weight of eggs obtained, as well as percentage of eggs to the total weight of fish