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近年来鱼类养殖病害越来越严重：鱼类病害已超过１００种，其中危害严重的达１０多种，有些甚至造成了灾难性损失，如２０世纪９０年代初淡水鱼的暴发性出血性败血症、前几年广东部分地区流行的鳜鱼出血病等。造成这种状况的原因除了环境因素和人为因素外，还与鱼体自身的抗病
In recent years, fish diseases have become more and more serious: more than 100 fish diseases have been harmed, of which more than 10 are seriously endangered. Some of them even caused catastrophic losses such as fulminant hemorrhagic septicemia of freshwater fish in the early 1990s A few years ago in some parts of Guangdong popular catfish bleeding and so on. In addition to environmental factors and human factors, the reasons for this situation, but also with the fish’s own disease resistance