The paper considers the functional changes in the reproductive function of sturgeon species of different ages and their hybrids. The dynamics of the development of gonads of females and males during the reproductive cycle is studied. According to the results of studies, it is shown that when the hydrological and hydrochemical regimes of cultivation are stabilized, spawning intervals are reduced, as well as the time of maturity. In this case, the physiological and biochemical status of females at the final stages of maturity is normal, which is confirmed by research results. The development of oocytes in females raised under regulated conditions takes place without any deviations.
In this paper, we showed that in the cortex of mice expressing an abberant form of FUS protein that model amyotrophic lateral sclerosis (ALS), the processes of KCl-induced and basal [(3)H]glutamate release and uptake are altered at the presymptomatic stage as compared to the non-transgenic littermates. The change in these three parameters in transgenic animals causes excitotoxicity, which, in turn, may lead to massive loss of motor neurons and the onset of ALS symptoms.
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.
The article presents the analysis and prospects of commercial aquaculture in the southern regions of Russia. Rostov and Astrakhan region and Krasnodar Krai are the leaders in commercial fish production. Rostov region annually grows 23-24 thousand tons. In Krasnodar region in the period from 2018 to 2022 there was a 15% growth of avcaculture production and in 2022 it was 23,3 thousand tons. In the Astrakhan region from 2018 to 2021 there was a decrease in this indicator by 13%, but in 2022 the volume of production in the region increased to 20.5 thousand tons. Absolute parameters in Stavropol Krai (11.8-12.3 thousand tons) Kabardino-Balkarian Republic (2.5-3.3 thousand tons) and Volgograd Oblast (2.3-2.5 thousand tons) remained almost unchanged. Significant growth of relative production parameters was noted in the Republic of Dagestan, the Republic of North Ossetia-Alania and the Republic of Crimea. The main objects of cultivation in the South of Russia are carp fish. A substantiation of creating a state-owned structure ensuring practical interaction between economic entities, executive bodies of state power, scientific and educational institutions is offered.
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