锚头鳋与中华鳋是危害淡水养殖鱼类的主要害虫,发生趋势逐年加重。渔民每年防治鱼虫的用药次数显著增多,而防治效果下降,其中一个很重要的原因是病原生物对所 Anchovy and ostreatus are the major pests that endanger freshwater cultured fish, and their occurrence trends are increasing year by year. Fishery prevention and treatment of fish and insects every year a significant increase in the frequency of medication, and prevention and control decreased, one of the most important reason is the pathogen on the