The study of hematological parameters is an important method of studying the health of fish in ecosystems that are exposed to the negative impact of the environment. In this work, we determined the presence of pathological changes in the red blood cells of the crucian carp of the Samara River under conditions of anthropogenic stress. The object of the study were six-year-old individuals of both sexes of silver crucian carp (Carassius gibelio (Bloch, 1782)). Morphological studies of erythrocytes were performed on blood smears, which were stained according to the method of Romanovsky-Gimza. During the analysis of the obtained data, the presence of cells with pathologies and the nature of these pathologies were determined. As a result of the conducted researches pathologies of erythrocytes which arise at toxicological poisoning of fish by heavy metals and organic compounds have been revealed. Were also recorded at all experimental points the pathologies indicating active adaptation of fish to environmental stressors.
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