Effects of dietary administration of probiotics (Bacillus subtilis) on the growth parameters of the fish Labeo rohita

In this study, we have evaluated the effects of dietary probiotic bacteria (Bacillus subtilis), on the growth parameters of the fish Labeo rohita. The probiotic (Bacillus subtilis) was procured from the market and mixed with the basal food in different combinations according to experimental need. In the present study, feeding trials were conducted in for 90 days in triplicate. For this feeding trial, live Labeo rohita were captured from the local fish farm located in Bareilly district. Fishes of similar body weight were distributed randomly into five glass tank that were continuously aeriated at Department of Zoology, Bareilly College, Bareilly, U.P. These five fish treatment groups were given five concentrations of Bacillus subtilis viz, 0.0 (T1), 0.5(T2). 1.0 (T3) 1.5 (T4) and 2.0 (T5) with basal feed. T1(0.0) was the control group that was fed on basal food only, without Bacillus subtilis for the same period. The effects of the probiotic (Bacillus subtilis) were analyzed by observing body length and weight after an interval of 15 days (at 0,15, 30,45, 60,75 and 90 days). Two treatment groups (T4 and T5) showed better growth of fishes, than any other treatment group. These results suggest that Bacillus subtilis can be an effective fish feed probiotic in the concentration 1.5% or 2% mixed in the basal feed for Labeo rohita in aquaculture practices.