A feeding trial was conducted in Hefei, Anhui Province, to demonstrate fingerling to market growth performance of grass carp using the ASA 80:20 pond production model and the ASA all-plant protein, 66% soy-product grass carp feed. Fish were stocked in three, 5-mu ponds at a density of 760 grass carp and 100 silver carp per mu. Grass carp grew from 49 g to an average weight of 751 g per fish in 190 days of feeding. Gross production averaged 544 kg/mu for grass carp and 115 kg/mu for silver carp. Average survival rates for grass carp and silver carp were 95.4% and 99%, respectively. Grass carp FCR with the 66% soy product feed averaged 1.36:1. Average net economic return was RMB 720 per mu, for an average return on investment (ROI) of 27%. Production and economic averages are for two ponds only, as fish were poached from one pond just before harvest. Results of the feeding demonstration showed that grass carp exhibited excellent feeding behavior, growth performance and FCR with the ASA 66% soy-product feed and 80:20 production technology. Grass carp reached the target market size and had good body shape and conformation, with little size variation. Grass carp were reported to have better taste than fish cultured on the farm using traditional techniques. Water quality was also reported to be much better than normal, and no disease problems occurred. The use of extruded, floating feed significantly reduced labor costs, lowered fish
FCR and improved water quality, and allowed production of healthy fish without the use of drugs or chemicals.