Svechkova N. Heavy metal contamination in the fish family іctalurovyh heterogencous resevoirs

Dissertation is devoted to the peculiaties of heavy metal contamination in the fish family ictalurovyh in different types of water bodies and their distribution in water,organs and tissues of channel catfish (Pridneprovsk's pools WFF, Tashlykskya cooling pond South -Ukrainian NPP.) and dwart catfish in natural ecosystems Shatskih lakes depending on their age, brand of feed, seasons. Bioindicative set value relative to the dwart catfish HM contamination of aquatic ecosystems. Study the content and distribution of heavy metals in the tissues and organs of the channel catfish and dwarf catfish is of interest from an environmental perspective. Raw material to address pollution control is to determine the concertrations of heavy metals in the tissues and organs of the channel catfish and dwarf catfish. The dynamics of ecological toxicological parametrs of channel catfish and dwarf catfish (Ictalurus nebulosus Lesueur,1819). It was conducted an environmental assessment of water quality (Pridneprovsk WFF ecosystems reservoirs -coolers Dnieper WFF. It the classification of A.O. Alokina (1970) water Dnipro river is a bicarbonate - calcium second type. Tashlykskaya water reservoir - cooler belongs to IV-III class of quality, which varies from sulphate - magnesium in chloride - sodium type. It was found that the excess of normalized values of heavy metals in water, food, certain tissues and organs of the channel and dwarf catfish didn't affect the decrease in fish productivity of different age groups, but it helped to reduce the nutritional value of fish. In order to obtain high-quality warm-water fish production in the cultivation of fish, it is necessary to change the basic principles of the use of heat. To reduсe the content of heavy metals and produce high-quality warm-water fish production in the culvitation of fish, it's necessary to change the basic principles of the use of heat. The fish mustn't be grown in water reservoirs-coolers, and using the water from them only as a carrier of heat. And the fish must be grown in isolated pools fed specially prepared water.