In many fish farms using the warm waters of energy facilities, for long periods, the water temperature can significantly exceed the temperature range favorable for fish rearing. Effective cultivation of juvenile sturgeons in these conditions is a pressing production issue. The purpose of the study is to determine the optimal heat costs for the existing technological stages of growing juvenile sturgeons based on the assessment of the temperature conditions of warm-water farms and their comparison with natural ones. To identify the differences in the specific heat of juvenile fish in the early period of development, based on the authors' research, existing literature data, recommendations and standards, theoretical calculations were carried out for two stages of cultivation (depending on the type and growing conditions). The actual values obtained indicate the optimal stepwise temperature regime for growing the great sturgeon (170 and 9°C/g), the stellate sturgeon (440, 60°C/g) and elevated values for cultivating the Russian sturgeon (420, 45°C/g) in comparison with the optimal calculated values. Based on the results obtained, the following optimal temperature ranges in terms of specific heat can be recommended for production when growing to a mass of 2.5-5.0 g: great sturgeon: 12-18°C; Russian sturgeon: 18-20°C; stellate surgeon: 18-23°C. Subsequent cultivation to a mass of 50-350 g is desirable to be carried out in the optimum zone, i. e.20-26°C.