在目前的饲养条件下,要消灭一切病原体是不可能的。因此,要控制鱼病的发生,必须从提高鱼体抗病能力入手。(一)合理混养此法不仅可以提高单位面积产量,对于预防鱼病也有较好的作用。因为不同鱼类其鱼体寄生物也不完全相同,某些寄生物只能寄生于某种宿主,别的鱼类对其具有免疫力 Under the current feeding conditions, it is impossible to eliminate all pathogens. Therefore, in order to control the occurrence of fish diseases, we must start from raising fish disease resistance. (A) reasonable polyculture This method can not only improve the yield per unit area, for the prevention of fish diseases also have a better effect. Because different fish their fish parasites are not exactly the same, some parasites can only parasitize in a host, other fish to its immunity