Authors : Amin Farahi, Milad Kasiri, Mohammad Sudagar and Fatemeh Alamshahi
Abstract: This study was conducted for 4 weeks to determine the effects of different concentrations probiotic Bacillus sp., on angelfish growth, larvae survival rate and tolerance against environmental stressor (high temperature). This experiment was carried out in a completely random design. Artemia urmiana naupli was used as a vector to carry probiotic bacillus to digestive tract of Pterophyllum scalare larvae. Nauplii with three concentrations of bacteria, 1x107, 2x107 and 3x107 bacteria mL-1 in suspension of broth for 10 h were bioencapsulated and angelfish larvae were fed by them. Angelfish larvae were fed 4 times a day. The control treatment was fed by unbioencapsulated Artemia nauplii. At the end of experiment, half of larvae in each treatment were challenged by high temperature (36°C) and their survival was calculated. The results indicated that the probiotic bacillus could influence on growth, survival rate and viability against high temperature stress in angelfish larvae. The final body length in experimental treatments had significant difference in comparison to control (p<0.05). In experimental treatments the survival rate did not show the significant difference (p>0.05) in comparison with control. Nevertheless, viability against high temperature stress in T1 (bioencapsulated Artemia with 1x107 cfu mL-1) was increased significantly (p<0.05) in comparison with control. The result indicate that different concentrations of bacteria could influence on growth, larvae survival rate and tolerance against environmental stressor (high temperature) in angelfish larvae and the findings can be useful in the performance of larviculture of this species.
Amin Farahi, Milad Kasiri, Mohammad Sudagar and Fatemeh Alamshahi, 2011. The Effects on Growth, Survival and Tolerance against Environmental Stressor (High Temperature) of Different Concentrations Probiotic Bacillus sp., Fed to Angelfish (Pterophyllum scalare Schultze, 1823) Larvae. Journal of Animal and Veterinary Advances, 10: 2305-2311.