The effects of mixture commercial live bakers' yeast and probiotic bacillus on growth and feeding performance and survival rate of silver carp (Hypophthalmichthys molitrix) larvae via bioencapsulated Artemia urmiana nauplii.

Hypophthalmichthys molitrix (Valenciennes, 1844) larvae is an important species for freshwater aquaculture. This study evaluated the effects of feeding a blend of probiotic bacilli bacteria (B. polymixa, B. licheniformis, B. circulans) and baker ́s yeast (Saccharomyces cerevisiae) on growth and feeding parameters and survival rate of Silver carp larvae. Artemia urmiana (Gǘnther, 1899) nauplii is an important live food that was used as a vector to carry probiotic bacillus to digestive tract of silver carp larvae. The fish larvae were fed at a level of 10 percent body weight at 4 times a day for 30 days. Fish larvae in experimental treatments were fed A. urmiana nauplii that were enriched by blend of 50 percent of Bacillus spp. with concentrations of 1×10, 2×10, 3×10 and 4×10 CFU mL and 50 percent of baker ́s yeast with concentrations of 1×105, 2×105, 3×105 and 4×105 cells mL (T1, T2, T3, T4, respectively) and were compared to fish larvae fed control diets of unbioencapsulated A. urmiana nauplii. The experiment indicated that feeding and growth parameters in fish fed experimental treatments were significantly higher than fish fed control diets (P<0.05) but survival rate did not significantly differ. Overall, the best group was fed the highest level of yeast and probiotic.

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