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１梅花斑状病 此病在长江流域一带常发生在７月中旬，症状为黄鳝背部出现黄豆大小的黄色圆斑。防治方法是：在饲养池里放养几只蟾蜍预防。已发病者可用１～２只蟾蜍，将头皮剥开，用绳系好，在池内反复拖几次，１～２日即可治愈。２锥体虫病 是锥体虫在黄鳝血液中寄生引起的。?
Plum spot disease The disease often occurs in the middle reaches of the Yangtze River in the middle of July, the yellow eel size of the yellow eel appears on the back of the eel. Prevention methods are: stocking a few toad stocking prevention. Has been the onset of available 1 to 2 toads, the scalp to peel, tied with a rope, repeatedly dragged several times in the pool, 1 to 2 days to be cured. 2 Trypanosomiasis is caused by the parasites of the pyramidal insects in the blood of the eel. ?