ВЛИЯНИЕ ТЕМПЕРАТУРЫ И ПЛОТНОСТИ ПОСАДКИ НА ПОКАЗАТЕЛИ ПЕРИФЕРИЧЕСКОЙ КРОВИ АФРИКАНСКОГО КЛАРИЕВОГО СОМА В УСЛОВИЯХ УЗВ

Abstract

The article presents the results of research on the influence of biotic and abiotic factors, in particular, planting density and temperature on the peripheral blood composition of the African sharptooth catfish. It was found that when the water temperature decreases by 4-60С, compared with the optimal temperature, the structure of differential blood count, the content of red blood cells and white blood cells changes in catfish. The answer to the effect of temperature factor affected polymorphonuclear cells and monocytes in differential blood count, and to a lesser extent, lymphocytes. The other components of differential blood count did not change significantly. Significant changes occurred in red blood system. When the temperature decreased, the content of red blood cells in the blood significantly decreased. At the same time, the content of white blood cells significantly increased. Similar reactions of the blood system were observed with increased planting density. It was shown that the proportion of monocytes with increased planting density increased significantly. It is monocytes that carry out phagocytosis, which allows the body to fight naturally against the penetration of foreign invaders. It should be noted that the proportion of monocytes increased by more than for 76% against the background of increased planting density. This is obvious due to the fact that with a high planting density, the concentration of fish metabolites in water increases.. A high level of organic matter contributes to the development of pathogenic and opportunistic pathogenic microbiota that threatens the body of fish. It is this process that, in our opinion, stimulates mechanism of increased production of monocytes.