ABSTRACT

It was established, that cortisol is an important component in development of mechanisms of fish adaptation to the impact of high concentration of allochthonous nitrogen. Seasonal changes of cortisol content in the blood plasma were noted. At high cortisol content in blood fish metabolism became more intensive and needed significant expenses of the energy resources of the organism. Over period of active detoxication and excretion of excess ammonia from the organism, cortisol content in fish increased 1.5-8.9 times as compared with control.