EFFECTS OF DIETARY PROBIOTIC Bacillus NP5 ON THE GROWTH PERFORMANCES OF CATFISH Clarias sp.

摘要

The addition of probiotics to feed has been widely applied to aquaculture practices and has been shown to provide beneficial effects to fish. This research aimed to evaluate the effect of probiotic Bacillus NP 5 to promote the growth of catfish. Five treatments and 3 replicates, namely 0% probiotic (control), 0.5 % probiotic, 1% probiotic, 1.5% probiotic and 2% probiotic (g/100 g feed) were used. The results showed that application of probiotic in catfish fed can promote better growth performance compared to control. Total digestibility and protease activity were significantly higher (P<0.05) in 1% probiotic compared to the other treatment. The value of specific growth rate was significantly highest (P<0.05) in 1% probiotic (2.67±0.18% day~(-1)), followed by 2% probiotic (2.63±0.02% day~(-1)), 1.5% probiotic (2.42±0.07% day~(-1)), 0.5% probiotic (2.29±0.14% day~(-1)) and control (1.60±0.01% day~(-1)). The addition of 1% probiotic in feed showed the best result on enzyme protease activities, protein digestibility, total digestibility, the final weight, specific growth rate, weight gain, feed efficiency and protein efficiency ratio among other treatments.