Changes in the physiological state of hiemal form of the Russian sturgeon Acipenser gueldenstaedtii in the Volga after holding It and hormonal impacts

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Abstract
Physiologobiochemical indices of males and females of the hiemal form of the Russian sturgeon Acipenser gueldenstaedtii of the summer and autumn periods of migration to the Volga after a prolonged holding (6–12 months) in the lower reaches of the river were determined. The possibility of gonad development and maturation after hormonal stimulation at a complete absence of the river period of migration and exogenous feeding was confirmed. In this period, regular changes in the concentrations of androgens, protein, glucose, and cholesterol in the blood serum that provide the necessary level of metabolism and testify to a high adaptation flexibility of these fish take place.