Heavy metal content in the muscle of bream in different reaches of the Rybinsk reservoir

The purpose of the study is to determine the concentration of heavy metals (Cd, Pb, Al, Cr, Cu, Mn, Fe, Co, Ni, V) in the muscle tissue of bream from the Sheksna and Volga reaches - areas of the Rybinsk reservoir, which differ in the level of anthropogenic impact. Tasks - to reveal the intensity of accumulation of heavy metals in the muscles of bream from these stretches; evaluate the safety of meat for human consumption. The object of the study were sexually mature, approximately the same size individuals of bream caught by trawl during the feeding period (n = 40). Fish were dissected muscle tissue and frozen until analysis. In the laboratory, the fabric was dried at 60 °C to constant weight, and the content of heavy metals was determined using an OES ICP Optima 2000 DV (Perkin-Elmer, USA). It was found that Al, Fe, and Co accumulated more intensively in the muscles of the bream from the Sheksna reach, which was subjected to a greater anthropogenic load. The relationship between the accumulation of toxicants in the body of fish and their negative impact on the physiological and biochemical parameters of bream has been confirmed. The synchronism of Fe bioaccumulation depending on their concentration in bottom sediments was revealed. The following average concentrations of heavy metals in the muscles of bream from the Rybinsk reservoir were obtained: Cd - 0.005 mg/kg; Pb - 0.048; Al - 10.414; Cr - 0.149; Cu - 0.978; Mn - 0.631; Fe - 8.692; Co - 0.006 mg/kg. The content of Ni and V turned out to be below the detection limit. The results obtained meet the requirements of domestic and international standards, therefore, bream muscles are safe for human health and can be eaten.