近几年来,养鱼事业有了很大的发展。随着新的水域开辟利用,扩建渔场,以及城郊养鱼、网箱养鱼的发展,地区间鱼苗、鱼种优良品种的调运交换,日益频繁。而检疫制度的不完善,更相应地扩大了鱼病的传播和流行。在这样情况下,不仅池塘、湖泊, In recent years, there has been a great development of fish farming. With the opening up and utilization of new water areas, the expansion of fisheries, and the development of fish culture in the suburbs and cage fish farming, the transfer and exchange of fine varieties of fish fries and fish species in different regions have become increasingly frequent. The imperfect quarantine system has correspondingly expanded the spread and prevalence of fish diseases. In such circumstances, not only ponds, lakes,