渔业是我国农业的一个重要组成部分,2003年全国水产品产量达4300余万吨,人均占有量35公斤,水产品的生产为改善我国居民的消费结构,提高饮食消费水平和对外贸易做出了积极的贡献。然而,近年来由于环境的污染和生产方式的不断变更,水生动物养殖疾病越来越趋上升态势,不仅给养殖生 Fishery is an important part of agriculture in our country. In 2003, the national output of aquatic products reached 43 million tons and the average per capita amount was 35 kg. The production of aquatic products has made great achievements in improving the consumption structure of our residents, raising the level of food consumption and foreign trade Positive contribution. However, in recent years due to environmental pollution and the changing mode of production, aquaculture diseases more and more rising trend, not only to aquaculture