This study was assessed the effects of dietary phytocee, crude herb mixture, on clarias catfish growth performance, and carcass composition under vitamin C phosphate (vitC-PP 35%) reduction. The experiment was assigned in CRD with 5 treatment diets and 4 replicates; a) T1PC0: diet with the vitC-PP 100%,175ppm(active) b) T2PC25 diet with the vitC-PP 75%,131.25 ppm, and phytocee 250 ppm c) T3PC50 diet with the vitC-PP 50%,87.5 ppm, and phytocee 500 ppm d) T4PC75 diet with the vitC-PP 25%,43.75 ppm, and phytocee 750 ppm. e) T5PC100 diet with the vitC-PP 0%, 0 ppm, and phytocee 1,000 ppm. Eight hundred clarias catfish with initial mean 15 gram/individual were randomly distributed into 1500L of 20 tanks that contained freshwater 500L and stocked 40 fish per tank (80 pcs/m3). Fish were fed experimental diets 3-7%BW, 3 times a day during 8 weeks of feeding trial. The growth performance and carcass composition were investigated. The results showed that the growth performance in terms of fish production, final weight, and average daily gain were significantly differences (p<0.05). Feed conversion ratio was significantly low (p<0.05) when increased phytocee from 250 to 500 ppm in vitC-PP reduction diets to 87.5 ppm (active). Moreover, the survival rate was significantly improved (p<0.05) when increased phytocee from 250 to 750 ppm in vitC-PP reduction diets to 43.75ppm (active). Carcass composition in terms of percentage of fillet was not effected when increased phytocee from 0 to 750 ppm in vitC-PP reduction diets to 43.75ppm (active) but fillet yield was significantly decreased (p<0.05) when reduced vitC-PP to 0ppm even adding phytocee 1,000 ppm still could not keep normal fillet yield range.
Therefore, dietary phytocee 250 to 750 ppm was recommended in vitamin C phosphate reduction diets from 175 to 43.75 ppm (active) for maintain normal growth performance, improving feed utilization, enhance survival rate and maintain normal fillet yield range under density stress condition of 80 pcs/m3.