МОРФОФИЗИОЛОГИЧЕСКИЕ АДАПТАЦИИ АФРИКАНСКОГО СОМА К ВЫСОКИМ ПЛОТНОСТЯМ ПОСАДКИ В УЗВ

Abstract

The article presents the results of research on the effect of increased planting density on the body of african catfish. Vital organs that play a fundamental role in fish metabolism were studied: heart, liver, kidneys, and spleen. Morphophysiological adaptations of the african catfish to unfavorable environmental conditions were evaluated. The results showed that an increase in planting density causes a number of negative changes in the fish body. In pools with increased planting density, the average fish mass was significantly less than in the control. The greatest slowdown of the growth rate and biomass set was observed when the planting density increased by 30%. It was established that the liver mass increased with increasing planting density, and males had significantly larger livers than females. Liver indices P and Q increased with increasing planting density in males and females and were higher the higher the planting density. Kidney mass and their P and Q indices in catfish showed that increase in planting density depresses the kidneys, causing a decrease in their mass against the increase in the P and Q indices. With increasing planting density, the absolute weight of fish spleen decreased. A study of the heart mass of the african catfish showed that with increasing planting density, the heart mass and P and Q indices increased, due to the high energy costs of survival.