新开挖的鱼塘养鱼有一些不利因素,如水质清淡,不易培肥,水喷不稳定,水中溶有重金属盐类,对鱼类有一定毒性,怎样克服这些不利因素呢?钢山县柳新渔场1986年春季新开挖鱼塘320亩,当年养鱼。其中160亩鱼种塘,当年鱼种平均单产311.5公斤,160亩成鱼塘,成鱼平均单产420.5公斤。在饲养管理上,他们的做法: The newly excavated fishpond fish have some unfavorable factors, such as light water, difficult to fertilize, water spray instability, heavy metal salts dissolved in water, have some toxicity to fish, how to overcome these unfavorable factors? Liu new fisheries 1986 new excavation fish ponds 320 mus, then fish. Among them, 160 mu fish ponds were produced, with an average yield of 311.5 kilograms of fish species and 160 mu of fish ponds. Average adult fish production was 420.5 kilograms. In feeding management, their approach: