Hematological parameters are quite effective and informative for determining the health status of fish populations. They respond quickly to changes in habitats of different nature. The Prussian carp is one of the most widespread species in the Ukrainian reservoirs. Currently, the researches of hematological changes of this species in the modern conditions of the Zaporizhyian (Dnipro) reservoir are quite relevant. During the research the ecological classification of surface water quality in Ukraine, it was found that the water in the Samara Bay is characterized as "moderately polluted", and in the lower part of the reservoir it is "slightly polluted". The concentration of almost all investigated heavy metals in the water of the Samara Bay is higher compared to the lower part of the reservoir. The number of erythrocytes and hemoglobin content in the blood of Samara Bay fish were lower by 22.4% and 44%, respectively, compared to fish in the lower part of the Zaporizhian (Dnipro) reservoir, and the erythrocyte sedimentation rate was higher by 81.8%. In the Prussian carp from the silver Zaporizhian (Dnipro) reservoir, neutrophilic leukocytosis with a shift to the left was observed, which is usually characteristic of inflammatory processes and various intoxications. There were also statistically significant deviations in the activity of ALT and AST in the blood plasma of fish in the Samara Bay, which may indicate a chronic impact of a complex of anthropogenic factors on fish, especially on the function of the liver, which serves as a detoxifying organ.
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