Abstract
This study was conducted to evaluate the effects of dietary Bacillus subtilis and fructooligosaccharides (FOS) on immune response and disease resistance of red tilapia (Oreochromis sp.). The experiment was in a completely randomized design with 4 treatments including control; B. subtilis (107 CFU/g); B. subtilis (107 CFU/g) and 0.2% FOS; B. subtilis (107 CFU/g) and 0.5% FOS. Sampling was conducted after the fish fed diets containing B. subtilis and FOS for 2 weeks, 4 weeks and after 3 days of infection with Streptococcus agalactiae. The result of hematology showed that the total erythrocyte, leukocyte, monocytes, neutrophils, lymphocytes and lysozyme activity were significantly increased (p
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