鳃是鱼类的重要呼吸器官,鱼体与外环境的气体交换主要由鳃来完成。鳃发生病变鱼类呼吸不畅,必然影响鱼类的正常代谢和生长。当鱼的鳃患病影响了鱼类的正常呼吸,鱼体会通过自身调节提高呼吸运动节律来弥补病鳃气体交换的不足,当鳃的气体交换量降低到不能维持最低生命活动需要时, Gill is an important respiratory organ of fish, fish and the environment outside the gas exchange is mainly done by the gills. Gill lesions diseased fish breathing poor, will inevitably affect the normal metabolism and growth of fish. When the gills of fish affect the normal respiration of fish, the fish will make up for the lack of gas exchange through the regulation of respiratory movement rhythm by its own regulation. When the amount of gas exchange in the gills is reduced to the need of maintaining the minimum life activity,