稀土，用于养鱼有防病、促长的作用。一般每亩用5元左右稀土，即可增产鲜鱼20-30公斤。 用稀土养鱼，其一，可提高鱼类成活率。稀土喂鱼后，草鱼成活率提高28.6%，鲢鱼成活率提高14.3%，鳙鱼成活率提高20%左右。其二，能提高产量。稀土可促进鱼的生长。据报道用稀土养草鱼，亩 Rare earth, used for fish prevention, promote long role. Generally about 5 yuan per mu with rare earth, you can increase the production of fresh fish 20-30 kg. With rare earth fish, one, can improve the survival rate of fish. Rare fish feeding, grass carp survival rate increased 28.6%, silver carp survival rate increased 14.3%, catfish survival rate increased by about 20%. Second, to increase production. Rare earth can promote fish growth. It is reported that with rare earth grass carp, mu