The aim of the study was to determine the effect of using fermented feed by probiotic to the growth rate, body weight, body length, survival, feed efficiency and feed conversion rate of pomfret (Colossoma macropomum) in recirculation system. The treatment in this study was the different dose of probiotic for the feed fermentation, and the doses were 9 ml / kg of feed (P1), 12 ml / kg of feed (P…