在目前的饲喂条件下,要消灭一切病原体是不可能的。但要控制鱼病的发生,可采取以下几方面措施来综合提高鱼体抵抗力。1.合理混养不同鱼类的寄生物不完全相同,某些寄生物只能寄生于某种寄主,别的鱼类对其有免疫力,而混养就可使这种鱼的个体密度稀少了。此外,混养不同食性的鱼类, Under the current feeding conditions, it is impossible to eliminate all pathogens. However, to control the occurrence of fish diseases, we can take the following measures to comprehensively improve the fish’s resistance. 1. Reasonable polyculture Different fish parasites are not exactly the same, some parasites can only parasitize a host of other fish to its immunity, and polyculture can make the fish individual density is scarce . In addition, polyculture of different feeding habits of fish,