The article is devoted to the assessment of the toxic effects of cadmium acetate on fish. The research topic is relevant, since heavy metals, and especially cadmium, are ones of the most dangerous pollutants for the aquatic environment. After the emission of the already used water by the electricity-power plants into the reservoirs of circulating wa-ter, a sharp increase in the maximum permit-ted concentrations of heavy substances can be observed often, which act on hydrobi-onts for a rather short period of time. That is why, modeling this effect is necessary to study the effects of heavy metals. The aim of the assay was to study the hematological parameters of carp after exposure to various concentrations of cadmium acetate. During the experiment, 5 groups of fish were formed - 1 control group (10 fish), 4 experimental groups - 10 fish each. The experimental groups of fish were exposed in a solution of cadmium acetate (Cd (CH3COO) 2) with concentrations of 0.05 mg / l, 0.5 mg / l, 5 mg / l, 50 mg / l (exceeding the maximum permissible concentration of cadmium for fisheries in 10, 100, 1000 and 10000 times respectively). We have investigated: the erythrocyte sedimentation rate, the
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