一、细菌性烂鳃病 [症状]病鱼体色发黑,尤以头部为甚,又叫此病为“乌头瘟”,游动缓慢,对外界反应迟钝,呼吸困难,食欲减退,病情严重时,离群独游水面不吃食,对外界刺激失去反应。将病鱼捕起来看,可见鳃盖内表面皮肤往往发炎充血,中间部分常糜烂成一圆形或不规则形的透明小窗。俗称“开天窗”,鳃上的粘液增多,鳃丝肿胀。鳃的某些部位因缺血而呈淡红色或灰白色,有的 First, the bacterial gill disease [Symptoms] fish body color black, especially in the head is even worse, also known as the disease as “Aconitum”, slow swimming, unresponsive to the outside world, dyspnea, loss of appetite, Serious illness, outing alone do not eat the surface of the water, the external stimulus loss of response. Catching the diseased fish to see, the inner surface of the operculum is often seen inflamed inflatable skin, the middle part often erosion into a circular or irregular shaped transparent small window. Commonly known as “open skylight”, increased mucus on the gills, gill filaments swelling. Some parts of the gills due to ischemia and pale red or gray, and some