Topicality of native fish fauna reproduction of Ukraine reservoirs

Conservation of natural aquatic ecosystems rich in native fauna, is important in the sense what we pass on a legacy to future generations. The determining factor in ecosystems formation, including the ecosystems of rivers, is river flow. It influences on level of aquatic environment resistance to the anthropogenic activity, on self–purification process and biological productivity, species composition, quantity of hydrobiota, in particular of ichthyophauna. Human impact on the functioning of natural hydroecosystems and increased human press, interference into stable hydrological parameters of reservoirs, fishing increasing and fishing gears improving have led to the extinction of some species and reduction of others. Ways of such intervention were diverse: construction of hydropower facilities have led to the fragmentation of rivers channels and violation of migration routes of semi– and anadromous fish; not qualified hydrotechnical works destroyed spawning and wintering pit. Prevention of negative effects of human activity has social, economic and environmental values and will promote the conservation native fish fauna biodiversity of inland waters and the possibility of further expanding the range of delicious fish products. An introduction of such fish as sturgeon, beluga, Danube salmon, grayling and vyrezub in aquaculture should help the positive solution of this problem in Ukraine.