Abstract: An experiment on the carbon source from supplementary wheat bran was carried out in the mixed ponds of silver carp and carps, in order to study the effect of wheat bran on the bioflocculation generation in the ponds under conventional culture and its influence on the fish growth and the aquaculture water quality. The results showed that supplementary wheat bran could significantly promote biological flocculation, with the fresh fish yield increased by 16.32% compared with the control fish ponds. The weight gain rate, specific growth rate and growth potential of the experimental fish ponds were significantly higher than those of the control ponds. The growth performance of silver carp was higher than that of carp, and the feed coefficient of carp was lower than that of the control fish ponds. The effect of bioflocculation on the growth of silver carp was higher than that of carp. Compared with the control fish ponds, the water transparency of the fish ponds with supplementary wheat bran decreased, the total suspended solid concentration increased, the concentration of nitrite nitrogen, amino nitrogen and total nitrogen significantly decreased, and the water quality of the aquatic water was improved.