To determine antagonistic effect of Clostridium butyricum against Vibrio harveyi and its probiotic effect on growth performance. digestibility and immune response of fresh water prawn. Macrobrachium rosenbergii juveniles were examined following feeding with C. butyricum incorporated feed for 60 days. https://www.spidertattooz.com/OMEGA-Seamaster-Aqua-Terra-150M-220-10-38-20-02-001-p15833/