草鱼食性广、生长快、产量高、肉质佳,为广大群众所喜食。但在养殖过程中,草鱼发病率高,如果不能及时诊断,做到对症下药,将会造成严重的经济损失。1.出血病该病由病毒引起,主要危害当年草鱼鱼种(从3.5厘米夏花到15厘米鱼种均可感染发病),发病时间一般从每年6月下旬开始,8月份为 Grass carp broad feeding, rapid growth, high yield, good flesh, for the masses of people like to eat. However, in the breeding process, the incidence of grass carp high, if not timely diagnosis, so that the right medicine, will result in serious economic losses. 1. Hemorrhagic disease The disease caused by the virus, the main hazard to the grass carp species (from 3.5 cm summer flowers to 15 cm fish species can be infected), the onset time generally from the beginning of June each year in August