The results showed in the soft water group of 1 . 50 mg / l cd2 + concentration , the fish were get serins contaminated and 33 % fish were died , the others were also get contaminated but no fish died 结果镉浓度为1 . 5mg l软水组7天内死亡率为33 ，而其它浓度的软水组和硬水组的草鱼均未出现死亡现象。
