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一、鳗鱼发病原因１．苗种放养密度过大许多养鳗业者认为高密度就能获得高产、高效益，而不考虑自身的土池条件、水源多少、水质好坏。一旦放养密度过大，必然会造成投饲量大，加快了水体富营养化，水质恶化，特别是每年５～１０月份为欧鳗发病高峰季节，死亡率可达８０％以上
First, the eel causes 1. Large stocking density of seedlings Many eel producers believe that high density can get high yield and high efficiency, without considering their own soil conditions, how much water, water quality is good or bad. Once the stocking density is too large, it will inevitably lead to a large amount of feeding, accelerating the eutrophication of water, water quality deterioration, especially from May to October each year for the European eel incidence peak season, the mortality rate of up to 80% or more