Two stocks of Baltic sturgeon (Acipenser oxyrinchus oxyrinchus) were cultured under different conditions. Initially, the first group was held in an earthen pond without water flow, and after three years It was moved to a tank in a closed recirculating system. The second group was cultured throughout the study period in a flow-though trout pond. Both groups were fed similarly. Fish growth in the earthen pond was unsatisfactory, and fish condition decreased, but the annual mean body mass increases in the flow-through pond ranged from 30 to 40%. After moving the first group of fish to the tank, the poor growth was compensated for and by the end of the 2011 the mean body mass of these fish exceeded the mean of that in the other group. The results of gonad maturity tests performed in the final phase of the study indicated there were maturing males in both groups of fish.
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