指环虫是我国淡水鱼类养殖中最常见的体表单殖类寄生虫病之一,此病流行广,遍及全国各地,且其发病率及其危害有逐年增长之势。特别在近年来,由于放种密度、用药量及水污染不断加大,它不仅限于草、鲢、鲫等常规养殖品种发病,且在鳗、鳜、鲈等特种养殖中也甚严重。尤其是当前的鳗拟指环虫病,几乎到了无药可治地步,对进一步发展健康养殖带来严重阻力。 Finger worm is one of the most common parasitic diseases of freshwater fish in China. The epidemic is widespread and spread throughout the country. Its incidence and harm are increasing year by year. Especially in recent years, due to the planting density, dosage and water pollution continues to increase, it is not limited to grass, silver carp and crucian carp and other conventional breeds incidence, and in eel, 鳜, perch and other special farming is also very serious. In particular, the current eel is intended to refer to cercariae, almost to the point where there is no cure for the disease and serious resistance to the further development of healthy farming.