Data on the occurrence of skin ulceration cases and concentrations of anthropogenic contami nants (PCBs; DDT; PAN; and heavy metals Hg, Pb, As, and Cd) in Baltic cod in the Russian exclusive eco nomic zone (EEZ) of the southeastern part of the Baltic Sea are presented and an attempt is made to analyze the relationship between the prevalence of disease and contaminant concentrations. In 2005-2009 the prev alence of skin ulcers was 0.7%. The share of skin ulceration in fish was maximal in 3 and 6 year old cod (1.0 and 1.1%, correspondingly) and in fish of the size group 39-45 cm (0.9%). Since 2007, a reduction of skin ulceration cases has been recorded in the Russian EEZ of the southern Baltic Sea. In 2005-2009, the concentration of contaminants in cod tissues did not exceed the permissible levels accepted in the Russian Federation. The relationship between the concentration of PCBs in skin and the prevalence of ulceration cases requires further studies.
As a result of a study of the Pravdinsk reservoir, it was found that the radiation situ ation can be estimated as safe. According to microbiological indicators, the water quality was assessed as polluted with β, α-mesosaprobic, 3-4 classes of water quality. During the "bloom" of water by Cyanobacteria, we observed the toxic effect on the test organisms Daphnia magna and Ceriodaphnia affinis, in this period the consumption of phytoplankton by zooplankton was low. According to benthos biomass, the reservoir is assessed as a water body with a high food value. The ichthyofauna included 14 species of fish that belonged to families of Cyprinidae, Percidae, Gadidae and Esocidae. 11 species of parasites related to Microsporidia, Myxosporidia, Trematoda, Cestoda, Hirudinea and parasitic Crustacea were found. Metatercaria of trematoda Apophallus müehlingi pathogenic for humans were found in roach and perch.
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