自今年3月份以来，福建省福清、仙游等地的欧鳗养殖场送检的病鳗中陆续发现有两极虫的感染。这些两极虫多寄生于鳗鱼的鳃丝内，引起鳗鱼鳃部红肿出血，粘液增多、食欲不振等病症。1、发病情况病鳗多为3月龄以下的幼鳗，发病初期体表无明显病症，鳃丝鲜红、出血，有的有增生或溃 Since March this year, Fujian Province Fuqing, Xianyou and other places of European eel farm inspection of eel gradually found in two polar worms infection. These parasitic insects parasites in the eel gill filaments, causing eel gill erythematous hemorrhage, mucus increased, loss of appetite and other illnesses. 1, the incidence of disease Eel is more than 3 months old juvenile early onset no apparent disease on the surface, gill filaments, bleeding, and some proliferation or ulceration