Adaptive processes in the body of whitefish (Coregonus lavaretus L.) caused by anthropogenic effects on aquatic systems were studied. It was demonstrated that the content of fatty acid acyls correlated with the water pollution level. The role of a decrease in the content of arachidonic acid in fish reproduction under adverse conditions is discussed. It is underlined that the quantitative alterations in the gonad and liver fatty acid patterns are unidirectional. A compensatory character of the changes discovered is hypothesized.
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