[Objective] The study aimed to discuss the regulation mechanism of adding colorant in feed on the digestive function of Pelteobagrus fulvidraco.[Method]450 fishes of P.fulvidraco,being clinical healthy and having even weight(10.4±0.1)g,were selected and divided into 5 groups randomly,which were added by colorant(Leader gold yellow,LGY) at 0,0.1%,0.2%,0.4%,0.8% resp.on base of feeding the basic diet and tested for 60 days.[Result]The addition of 0.8% LGY could increase the survival rate of P.fulvidraco signi...