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Salmonid fishes have always been the most valuable objects of the fisheries in the Baltic region. The population growth in Baltic region and the demand for fish products have resulted in the overfishing and impoverishment of many fishing areas. Most of wild types of fishes are losing their native spawning areas because of anthropogenic transformation involving hydro-technical construction, eutrophication of water bodies, water pollution and inadequate fishery. Heavy metals are considered as main toxicants in the p...