Abstract
The article presents the results of studies of schemes for stimulating ovulation of sturgeon caviar during rearing under conditions of regulated systems. Sturgeon (Acipenseridae) fish are characterized by high quality caviar and meat, and therefore are one of the main objects of cultivation in modern aquaculture. The achievement of sexual maturity of sturgeon fish when grown in facilities with a closed water supply cycle depends on the compliance with temperature and oxygen conditions, as well as species and the general physiological state of the fish itself. In modern aquaculture 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. Sterletт (Acipenser ruthenus) in comparison with other species of sturgeon fish reaches puberty at a much earlier date. The studies were carried out on the basis of LLP “Educational and Scientific Complex of Pilot Industrial Production of Aquaculture”. As it is known, pituitary injections and synthetic drugs activating the pituitary gland of sturgeons are used to stimulate producers. The study used sexually mature sterlet (Acipenser ruthenus) injected according to the combined stimulation schemes for carp pituitary gland and synthetic preparations “Surfagon”, “Nerestin-5”. To determine the 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 the studies, the following fish-breeding and biological indicators of sterlet producers (Acipenser ruthenus) have been determined: weight of fish, weight of eggs obtained, as well as percentage of eggs to the total weight of fish.