草鱼是湖南益阳县池塘和其他水体养殖的主要品种。养好草鱼能带动其他鱼类增产。但草鱼最大的弱点是易于发病,成活率低,一般只有65%,成鱼最低只有20%。鱼种最低只有10%,因而严重影响了群众养鱼的积极性,同时也波及了水体鱼产量。从1986 Grass carp is the main species of ponds and other water culture in Yiyang County, Hunan Province. Raising good grass carp can stimulate other fish production. However, the biggest weakness of grass carp is its susceptibility to disease, with a low survival rate of 65% and a minimum of 20% of adult fish. The lowest species is only 10%, which has seriously affected the enthusiasm of the masses of fish farming, but also affected the water fish production. From 1986