The effects of different concentrations of probiotic Bacillus spp. and different bioencapsulation times on growth performance and survival rate of Persian sturgeon (Acipencer persicus) larvae.

Abstract

4 Abstract: A 3 × 3 factorial experiment was conducted for four weeks to determine the effects of differen t concentrations of probiotic bacillus spp. and different bioencapsulation times on Persian sturgeon larvae survival rate and growth parameters. Daphnia with three concentrations of bacteria, 1×10 , 2×10 and 3×10 7 7 7 bacteria per milliliter in suspension of broth at 3 time of bioencapsulat ion (10, 5 and 3 hours) were bioencapsulated and sturgeon larvae were fed by them. Sturgeon larvae were fed 30 percent of their body weight for 5 times a day. At the end of the experiment we found that different times and different concentrations of bacteria could effect on growth parameters in Persian sturgeon larvae. Persian sturgeon larvae in different treatments fed bioencapsulated daphnia differ significantly in conversion efficiency ratio (CER), specific growth rate (SGR), food conversion ratio (FCR), condition factor (CF) and Daily growth coefficient (DGC) (P<0.05). Survival of all groups was no significantly different after 28 days. The result indicated that different times of bioencapsulation and different concentrations of bacteria could influence on growth parameters in Persia n sturgeon larvae (P<0.05).