The formulated principles of increasing the resistance of poikilothermic animals are justified. They allow the development of action plans for the sustainable management of fish species, including ways to rehabilitate and control the spread of pathogens. The results of the research are the scientific basis for creating stable communities and populations that allow assessing the impact of negative factors in environmental protection activities and increasing productivity in aquaculture.
Biochemical and immunobiological studies of blood samples from cyprinids, age-sex and size-weight analysis showed the presence of changes characteristic of stress. The study of cyprinids in aquaculture has established that the influence of stress of various origins on the resistance of fish and fish-breeding indicators is a current urgent problem, the solution of which is important both for assessing the reproductive potential of fish and for developing measures to eliminate the negative consequences of stress. When assessing the state of the experimental group of carp, taking into account body weight and length, it was found that their values are influenced by the temperature of the aquatic envi-ronment. The dependence of the level of cortisol and total protein of carp blood serum on sex, age, stocking density, temperature of the aquatic environment and the rate of its increase is shown.
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