Hankevych B. Fish-cultural and biological features of paddlefish Polyodon spathula (Walbaum,1792) in conditions of industrial aquaculture in ponds of Polissia and Forest-Steppe of Ukraine

The dissertation is devoted to the study of the peculiarities of rearing North-American paddlefish in polyculture of pond fish farms of Polissia and Forest-Steppe of Ukraine with the use of extensive and semi-intensive technologies in typical ponds with areas up to 74 hectares as well as in ponds with areas of 0.2–1.0 ha adapted for industrial aquaculture. Peculiarities of wintering of paddlefish seeds in usual wintering ponds were investigated. Peculiarities of winter maintenance of oar-bearing planting material in winter ponds of carp farms are investigated, growth and productivity indicators of oar-bearing in the process of growing to marketable mass are determined, peculiarities of nutrition of 2-year-old introducer and nature of heavy metals accumulation in organs and tissues of commodity oars are revealed. It was found that addition of paddlefish to pond polyculture with low level of intensification of aquaculture in total fish productivity up to 7.2–18.5% ensures an increase in the profit of production by more than 2.3 times with cost-effectiveness more than 20%.