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¹ Institute of Fisheries NAAS, Obukhivska 135, Kyiv, 03164, Ukraine
² Kherson State Agrarian University, Stritens’ka St. 23, Kherson, 73006 Ukraine DOI : 10.4194/AQUAST583 Viewed : 1295 - Downloaded : 1422 Optimization of the process of sterlet feeding in recirculating aquaculture systems allows improving the physiological status and pre-spawning performance of fish. The addition of the organophosphorus compound Catosal based on butaphosphamide to pre-spawning feeds leads to an increase in glycogenogenesis in hepatocytes, which manifests itself as a decrease in cell and nucleus area (by 1.20 and 1.31 times), stabilization of nucleoplasmic ratios (0.28-0.25). Butaphosphamide also causes an increase in hemoglobin and serum protein concentrations by 6.1 g/L and 3.92 g/L, respectively. An increase in the live weight of sterlet by 98.0 g and an absolute increase in weight by 1.96 g associated with an improvement in hematological parameters was observed. The excess phosphorus in the form of butaphospham, which is not involved in the process of glycogenesis, is transported to gonads and stimulates vitellogenesis. The acceleration of oocyte development is determined upon reaching the optimal polarization coefficient (0.05≤Pc≤0.10, category II). Keywords : Starlet, Pre-spawning feed, Catosal, Butaphosphamide, Oocyte, Eggs, Physiological status