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(一)出血病1.病症：由气单胞菌感染引起。病鳝体表出现许多大小不一的出血斑。以腹部和身体两侧最多，肛门红肿。解剖检查病鳝的鳃、肝、肾均有出血点，腹腔和肠道内积有淡黄透明状液体。病鳝游动无力，头常露出水面，呼吸困难。临近死亡时，不停地按顺时针方向打圈翻动而死亡?
(A) bleeding disease 1. Symptoms: caused by the infection of Aeromonas. Eel body surface many different sizes of bleeding spots. Mostly on both sides of the abdomen and body, anal swelling. Anatomical examination Eel gills, liver, kidney bleeding, the plot of the abdominal cavity and intestine with a transparent yellow liquid. Disease eel swimming weakness, head often exposed surface, breathing difficulties. When approaching death, stop and circling in a clockwise direction and death?