放养草鱼成本低、增重快、效益高,但由于草鱼较其它鱼类易患细菌性烂鳃病和细菌性肠炎,倘不及时进行防治和治疗就有可能发生群体大量死亡,死亡率可高达80～90％。 草鱼烂鳃病:俗称“开天窗”。多发生在气温高热的8～9月,即鱼类生长发育较快的时期。病变部位在鱼的头部和鳃部,病鱼鳃瓣颜色发白,呈粘稠状,并开始局部腐烂,鳃丝尖端有时可发现软骨外露。鱼体发黑,鳃盖处可蚀成一个小洞。病鱼离群独游,停止摄食,明显消瘦,直至死亡。 The cost of stocking grass carp is low, the weight gain is quick, and the benefit is high. However, due to the susceptibility of grass carp to bacterial gill disease and bacterial enteritis than other fish, large numbers of deaths may occur in groups without timely prevention and treatment, and the mortality rate may reach as high as 80 to 90%. Grass carp rotten gill disease: commonly known as “open skylight.” Occurred in the hot temperature of 8 to 9 months, that the rapid growth of fish during the period. Lesions in the head and gills of fish, disease fish gill petal color, thick, and began partial decay, gill filaments can sometimes be found at the tip of cartilage exposed. Black fish, the gills can be eclipsed into a small hole. Diseased fish out alone tour, stop eating, obviously thin, until death.