草鱼的生长速度快,饵料成本低,市场价格较稳定,是养殖户的主要养殖品种。由于大量投饵而不注意纤维的补充和鱼体的保健,致使草鱼发病率在某些地区呈逐步上升趋势。很多养殖户往往是见病用药,见虫杀虫,而不注意防疫和水质调控。大剂量用药造成水体藻相、菌相失衡,氨氮、亚硝酸盐等有毒 Grass carp fast growth, low food costs, the market price is more stable, is the main breeding farmers breeds. Due to the large amount of feeding without paying attention to the supplementation of fiber and the health of the fish, the incidence of grass carp has been gradually increasing in some areas. Many farmers are often see the disease medication, see pest insects, and do not pay attention to epidemic prevention and water quality control. Large doses of water caused algae phase, bacteria imbalance, ammonia nitrogen, nitrite and other toxic