近年来，随着我区淡水养殖业的迅速发展，特别是精养、半精养池塘的大幅度增加和大中水面网箱养鱼的不断发展，解决了我区城乡居民吃鱼难的问题。但随之而来的是鱼病的严重流行，高密度精养使鱼体更易受感染，发病率增高，鱼病流行快、危害大；南鱼北调也带来不少病源。鱼病已 In recent years, with the rapid development of freshwater aquaculture in our district, especially the intensive and semi-intensive ponds and the continuous development of large and medium surface aquarium fish, it has solved the problem that the urban and rural residents in our district eat fish hard . However, the ensuing serious epidemics of fish diseases, high-density intensive fish are more susceptible to infection, the incidence increased, the prevalence of fish disease epidemic, endangering large; Southern fish also brought a lot of pathogenic north. Fish disease already