草鱼长期以来一直都是我国广大地区池塘、网箱养殖的主要当家品种。但草鱼抗病力差,病害多,特别是“草三病”(烂鳃、肠炎、赤皮)和“出血病”是草鱼养殖生产上的常见病和多发病,其发病率约为80%,死亡率约为30%,成为推广草鱼集约化、规模化精养高产的瓶颈。“草三病”是细菌性疾 Grass carp has long been the main species in China’s ponds and cage culture. However, grass carp disease resistance is poor, many diseases, especially “grass three disease” (rotten gill, enteritis, red skin) and “bleeding disease” is a common disease and frequent incidence of grass carp breeding production, the incidence of about 80% , With a mortality rate of about 30%. It has become a bottleneck to promote grass carp intensification and large-scale intensive high-yielding. “Grass three diseases” is a bacterial disease