PREDICTION OF THE RESULTS OF CYPRINID (CYPRINIDAE) FISH SEED CULTIVATION FOR STOCKING IN THE LOWER DNIEPER RESERVOIRS

Purpose. To improve the technology of growing age-1+ carp by constructing mathematical equations for predicting the results of cyprinid fish seed growing in ponds, including the level of fish productivity depending on the level of intensification measures. Methodology. The study is based on theoretical, experimental and laboratory methods approved for fisheries, physical, chemical and hydrobiological studies. Findings. The studies demonstrated that the proposed mathematical equations allow determining the parameters of the results of the growing of common carp, silver carp, and grass carp as fish seeds for stocking them in natural water bodies of the lower Dnieper. The hydrobiological regime was at the satisfactory level and ensured the necessary quantity of fish juveniles with feed organisms. As a result of the cultivation, we received high quality fish seeds with body weight of over 100 g that met the standards. The obtained age-1+ fish are viable in the future and can survive wintering in natural water bodies. The dependence between the parameters of fish productivity of common carp, silver carp and grass carp, and the amount of compost applied at ratio of 500?5050 kg/ha of ammonium nitrate in the range 10?150 kg/ha of superphosphate within 10?40 kg/ha was described by mathematical equations. The study found that our proposed mathematical equation can determine the performance results of the cultivation of common carp, silver carp and grass carp as fish seeds for stocking them in natural water bodies of the lower Dnieper. The application of the mathematical equations, which takes into account the use of intensification measures (organic fertilizers, as compost and fertilizers like ammonium nitrate and superphosphate), makes possible to predict fish productivity in ponds. Originality. A mathematical model of the efficiency of growing age-1+ cyprinids under special conditions of the application of certain technological factors, and technical factors, including organic and mineral fertilizers, was developed. Practical value. The developed mathematical model gives an opportunity to predict the probable effectiveness of growing age-1+ cyprinids under the conditions of the use of certain technological factors.