Key words:ABSTRACT Heavy metals Accumulation Penetration Freshwater mussels of the genus Anodonta Soft bodyFeatures of accumulation of heavy metals in ecosystems of fish breeding ponds in the Sumy region were investigated. Features of the accumulation and distribution of heavy metals in the soft body of freshwater mussels of the genus Anodonta were defined. The results of the research indicate that the concentration of heavy metals in the studied components of the ecosystem of the fishery pond is in line with the existing norms. The content of heavy metals such as cadmium, plumbum and zinc in the soft body of the studied species of mussels did not exceed the normative values. The ways of receipt and accumulation of heavy metals in the soft body of freshwater mussels of the genus Anodonta were investigated. The dependence of their penetration and accumulation depending on the method of feeding and properties of metal ions were analyzed. The degree of accumulation of metals in the tissues of mussels was determined in relation to the content of elements in water.The coefficient of biological accumulation (CBN) was calculated, which is understood as the ratio of the concentration of heavy metals in the soft body of freshwater mussels to their quantitative content in the environment. It was proved that the concentrations of heavy and other toxic metal ions in the studied components of the hydrosystem of the reservoir were correlated with their normative values. The content of heavy metals in the tissues of the studied species of mussels is within the limits of permissible norms. It was determined that the coefficients of biological accumulation indicate not only the pollution of the environment with these metals, but also the biological availability of their ions in these conditions, and also indicate a low accumulation of trace elements of mussels.
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