以水体不同浓度铬 (CrCl3 6H2 o)处理草鲤鱼卵和鱼苗 ,观察铬对鱼卵的发育和鱼苗的毒性作用。结果表明 :铬处理组浓度高于 ( 2mg/L)对鱼苗、鱼胚发育有毒性作用 ;染毒 7天内 ,10mgCr/L组鱼苗致死率 30 % ,草、鲤鱼卵孵化率分别下降 4 6%和 88 9% ;15mgCr/L组草鱼苗致死率达 10 0 % ,鱼卵孵化率为零。两种鱼对铬的耐受量无明显差异 The grass carp eggs and fry were treated with chromium (CrCl3 6H2O) in different concentrations and the effects of chromium on the development of fry and fry were observed. The results showed that the chickens treated with chitosan at a concentration higher than 2 mg / L had toxic effects on the development of fry and fish embryos. In the 7 days of exposure, the fatality rate of fish fry was 30% in 10 mg Cr / L group, while the egg hatching rate in grass and carp decreased by 46% And 88 9%, respectively. The mortality rate of grass fry in 15mgCr / L group was 100%, and the hatching rate of fish eggs was zero. There was no significant difference in chromium tolerance between the two species of fish