REPRODUCTIVE FUNCTION OF FEMALE STURGEON FISH OF NATURAL AND ARTIFICIAL GENERATION

Abstract

In modern conditions, when the state of biological resources of sturgeon fish in the caspian basin has reached a critical level, the preservation and restoration of their stocks is possible only through artificial reproduction. currently, for the effective operation of sturgeon fish hatcheries (ARI) artificial reproduction, it is necessary to provide fish breeding processes with producers in the required quantity and appropriate quality, therefore, the most important task is the effective formation and rational operation of productive herds. In recent years, producers of artificial and natural generation from productive herds have been used at the ARI in the Astrakhan region, the offspring obtained from them differ in fish-breeding indicators. Studies of the reproductive function of female beluga and Russian sturgeon, domesticated and raised to maturity in pond conditions, were carried out. The obtained results of fish-breeding and biological indicators indicate that the reproductive function of female beluga and Russian sturgeon, matured in artificial conditions, slightly differ from fish of natural origin. The main fish-breeding indicators: the mass of females, the timing of puberty, absolute fertility, the percentage of fertilization, basically correspond to the values of fish of natural generation. Comparative analysis of fish-breeding indicators: the yield of caviar and relative fertility in beluga females of artificial and natural origin did not have much difference, while the females of Russian sturgeon, matured in repair-brood herds, gave caviar of better quality according to these indicators than domesticated individuals adapted to pond conditions.