Impact of feed ration on growth and the results of sterlet, Acipenser ruthenus L., artificial reproduction

摘要

In the study the effects of artificial reproduction of sterlet (Acipenser ruthenus) fed different feed ration were compared. Three doses of feed were used: 1.0%, 0.75% and 0.5% of the fish biomass per day. The results indicate that the feed rations for fish used for caviar production or breeding material should differ. The optimal ration for the quality of sex products and progeny was 0.75% of the fish biomass, whereas in view of the number of maturing fish, the better ration was that of 1% of the fish biomass. In group fed 0.75% of the fish biomass per day the highest GSI value, the largest eggs and hatch and the highest survival to the hatch were noted. The feed ration of 0.5% of the fish biomass was too low, as indicated by the low parameters of eggs obtained, their survival and the smallest number of mature and ovulating females. These results can provide direction for the creation and exploitation of spawner stocks as well as for other sturgeon species cultured under controlled conditions.