3.病症欧洲鳗“狂游病”表现为很大的群体性,精养池病鳗大量堆积在池中排污箱上,软弱无力,徒手可捉;摄食强度不减,堆积之前甚至明显强摄食;病鳗环游不规则,小规格鳗出现间隙性窜动多;体色变淡;池间、场内、局部地区出现先后发病“传染”;全场毁灭性死亡;池中个体大者先发生死亡 3. Illness European eel “mad swim disease” showed a large group, intensive pond eel accumulation in a large pool of sewage tank, weakness, freehand; feeding intensity diminished, even before the accumulation of obvious strong food accumulation ; Sick eel around irregular, eel small play more intermittent play; body color fades; pool, field, some areas have the incidence of “infection”; audience devastating death; Death occurred