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鱼病是由于鱼、病原体及环境相互作用的结果,在鳗鱼养殖的恶化环境中,病原体如病毒、细菌、真菌及寄生虫等导致了鱼病发生.随着养鳗业的发展和鱼病的蔓延,鱼病已引起人们的重视.日本静冈县鳗鱼发病状况在1978～1982年五年间,据统计,每年患病死亡率占年产量的9.9～16.3%,每年受害鱼约有1,000吨,1978年患严重肾炎病的死亡率高达46.3%,到1981～1982年产量下降10%,1982年患一般烂鳃病和肠炎病死
Fish diseases are the result of the interaction between fish, pathogens and the environment. Pathogens, such as viruses, bacteria, fungi and parasites, lead to fish diseases in the deteriorated environment of eel farming. With the development of eel farming and fish diseases The incidence of eel in Shizuoka County, Japan in the five years from 1978 to 1982, according to statistics, the annual mortality rate accounted for 9.9 to 16.3% of the annual output of about 1,000 tons of fish victims each year, Mortality in severe nephritis was as high as 46.3% in 1978 and by 10% between 1981 and 1982, with general gill disease and enteritis dead in 1982