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This article is dedicated to the question of passage of sturgeon through a dam of a hydro-electric power plant (HPP) during spawning migrations. A model of distribution of water velocity in the tail water of HPP was constructed. On the basis of this model a model of sturgeon distribution under a dam of HPP was created. The latter model was analyzed numerically in conformity with the largest HPP on the Volga river—Volgograd’s HPP (Russia). The results of analysis allowed estimation of sturgeon passage from the tail water to the head race. Measures for increase of effectiveness of this process were elaborated.