养鱼塘里成鱼常被一种名叫中华鳋的寄生虫寄生在鱼鳃上,由于这种寄生虫的大小、体型及颜色象蝇蛆,因此养鱼户习惯的称之为“鳃蛆病”。此病的主要症状是:翻开鳃盖,肉眼可见鳃丝末端桂着像白色蝇蛆一样的小虫,鳃丝末端肿大发白,病鱼食欲减退,离群独游,轻则影响生长,重则死亡。同时被它侵入的伤口,常引起病菌侵入,造成其它疾病并发,使鱼致死。此病在每年5～9月最易流行,主要危害1龄以上的草鱼和花、白鲢鱼。 Fish in fish ponds are often parasitic on fish gills by parasites known as Chinese giant salamanders. Because of the size, shape and color of the parasites, larvae are often called “gill maggots disease”. The main symptoms of the disease are: open the gill cover, visible gliacyte end of the eye gill like white maggots like insects, gill filaments swollen whitish, diseased fish appetite, outlier solstor, ranging from the impact of growth , Heavy death. At the same time it is invaded by the wound, often causing bacteria invade, resulting in other diseases complicated, so that the fish died. The disease is most likely to be epidemic from May to September each year, with the major hazards being grass carp and flower and silver carp more than age one.