1999年 6月 9月 ,使用池塘 3口 (面积 1 2 1hm2 )培育草鱼种。经 87d ,总产 10 5 71kg ,其中草鱼种6 2 49kg ,出塘率 92 5 % ,饵料系数 1 5 7;鲢、鳙鱼种 432 2kg ,出塘率 71 3%。总产值 7 35万元 ,利润 4 15万元。同时对草鱼夏花至秋片不同生长阶段蛋白质需求量 ,以及颗粒饲料粒径与鱼口裂大小关系等进行了试验。 In June 1999, 3 species of grass carp were cultivated using 3 ponds (area: 121hm2). After 87 days, the total output was 10571kg, of which 6249kg were grass carps, 92.5% of them were out of ponds, and the feeding coefficient was 57.7. The total output value of 7.35 million yuan, profits of 4 150,000 yuan. At the same time, the demand of protein during the different growth stages from summer to summer in grass carp was studied, and the relationship between particle size and the size of fishmouth crack was tested.