The study effect of probioic bacillus on growth of Rainbow trout (Oncorhynchus mykiss) larvae via Supplementation with meal of Daphnia magna
Message:
Abstract:
Effect of probiotics on Rainbow trout (Oncorhynchus mykiss) larvae based on growth performance, and feed utilization (feed conversion ratio, FCR) was investigated. The 5 species of endospore bacillus, B. licheniformisi, B. subtilis, B. polymyxa, B. laterosporus and B. circulans, as a blend of probiotic bacteria, were employed in 4 concentrations for supplementation of diet. Daphnia magna was cultured in the ground ponds. The meal of Daphnia magna was used for feeding of Rainbow trout larvae.The blends of probiotic bacillus was prepared under the procedure of Protexin Co. (Iran- Nikotak). The trout larvae were fed on 10 percentage of their body weight, for 6 times a day. 15 fiberglass circular tanks with replicates for experimental and control treatments were used. This experiment was conducted in a completely random design. Trout larvae (avg 7510mg) were fed diet (meal of Daphnia) supplemented with1×105 (diet D1), 2×105 (diet D2), 3×105 (diet D3), 4×105 (diet D4) bacteria (CFU) per g feed for 28 days. The control diet (CD) was not supplemented with the bacteria. The results showed that in the all experimental treatments, the growth parameters significantly increased (P0.05). Diet D1 resulted in significantly better growth, a lower feed conversion ratio and higher protein efficiency ratio (PER) than the control and other experimental treatments. No significant difference was observed between the survival rate of control and experimental treatments (P0.05). The minimum of final body weight in control (260.32 mg) and the maximum of weight were obtained in D1 (314.02 mg).In probiotic treatments, food conversion efficiency were increased while the relative food intake significantly decreased (P0.05). The specific growth rate in probiotic treatments, was increased. The probiotic bacillus had significant positive effects on relative gain ratio, average daily growth and thermal growth coefficient. In conclusion, the experiments showed that the probiotic bacillus highly increase the growth performances and feeding efficiency in trout larvae. Furthermore, different levels of probiotic bacillus indicated different performance.
Language:
Persian
Published:
Journal of Agricultural Sciences and Natural Resources, Volume:16 Issue: 3, 2010
Page:
48
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