Some aspects of the control of the reproduction function in female sturgeon fishes

Abstract

Two series of experiments on the effect of E-selenium on the reproductive function of sturgeons were conducted with different ways of introducing the drug into the body: through feed and injection. The effectiveness of the action of E-selenium was shown in two experiments. First, its ability to accelerate the process of maturation of oocytes was revealed due to the stimulation of generative metabolism and bringing it into line with the stages of the sexual cycle based on the biochemical parameters of the blood. An increase in the concentration in the blood by 1.4 times by the end of the 50-day experiment of total protein and beta-lipoproteins, which include ovovitelin (vitellogenin) during the period of vitellogenesis, as well as a moderate increase in haemoglobin concentration, indicates an increase in generative metabolism. It was noted that the metabolism of control fish was directed to somatic growth to a greater extent than that of experimental fish, as a result of which the average weight of females in control was 1.5 times higher than in the first series of experiments and weight of experimental fish was the same and increased by 6% in power in the second series. The role of the drug as a stabilizer of the physiological state of females, due to its high antioxidant properties, has been noted. When used, the existing signs of a stress state disappear, in contrast to the control fish in which they are detected: an increased cholesterol level, an erythrocyte sedimentation rate (ESR), and a decrease in haemoglobin concentration. The most significant effect from the use of the drug was obtained when the feed was irrigated with E-selenium, in which the number of mature fish after 50 days of the experiment was 2.7 times greater than in control, with a simultaneous halving of immature fish. In the case of the injection of females with this preparation, the number of fish at the IV stage of gonadal maturity in the experimental group after 50 days increased by 1.7 times. In the control group, on the contrary, it decreased by 1.2 times, with a constant proportion of females by the III stage of gonadal maturity.