Makarenko A. Optimization of technological and methodological approaches to rearing of young hybrid of white bigheads for stocking of complex basins with fish

The main features of influence of technological parameters on the results of rearing of young hybrid of white bigheads in ponds with different ages and body weights for stocking of natural water bodies were received and analyzed in the dissertation, and the ways of optimization of technological and methodological approaches of their rearing were developed for receiving of qualitative salable products. For the first time, new data were received about the content and distribution of glycogen, proteins, lipids in different age-length groups of hybrid of white bigheads of different basins and fish farming areas and their impact on fish productivity and nutritional value of fish. The expediency and efficiency of application of calculated forecasting of average weight are substantiated, and the methodical framework of quantitative estimation of survival of stocking material of hybrid of white bigheads of various samples is offered. The results on survival of stocking material with samples smaller than traditional ones depending on the density of predators and specific (equivalent to 1 ha) volumes of stocking with herbivorous fish were obtained. When the concentration of large-scale predators is less than 60 kg/ha, the economic criterion for effectiveness of stocking with this-year-old bigheads is the main criterion - the ratio of their survival in a particular water reservoir and cost of stocking material. The results of studies can be used when carrying out the simulation measures in water reservoirs which are operated in the regime of special commodity fisheries and carry out the recommended stocking with two-year-old bigheads with a weight of at least 100 g with a fish-holding density of 200 specimens/ha or when increasing stocking volumes with this-year-old fish up to 300 specimens/ha with consideration to the established limitary indicators of ichtyomass of predatory fish (pike perch and jack) at the level of 60 kg/ha (pike perch - 40-50 kg/ha, jack - 10-20 kg/ha or one jack - 30-45 kg/ha), when stocking with this-year-old fish will be impractical due to wholesale eating by predators.