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通过向水体添加不同浓度的汞(Hg~(2+)),观察其对中华绒螯蟹幼蟹(2.01±0.16)g的毒性影响。结果表明,Hg~(2+)对其24,48,72,96 h的半致死浓度(LC_(50))分别为0.542 8,0.471 6,0.433 2和0.342 3 mg/L.中华绒螯蟹幼蟹在0,0.01,0.05,0.10,0.20,0.30 mg/L的Hg~(2+)条件下饲养40 d后,各浓度组幼蟹存活率分别为96.67%,86.67%,73.33%,63.33%,56.67%,43.33%;增重率和蜕皮率随着Hg~(2+)浓度的升高而降低。可见水体中的Hg~(2+)能够抑制中华绒螯蟹的生长和蜕皮,高浓度的Hg~(2+)甚至会造成幼蟹的死亡。根据Hg~(2+)对中华绒螯蟹的毒性作用确定水体中汞的最大允许量为0.034 2 mg/L。
The toxic effects of Hg 2+ on the juvenile crab (2.01 ± 0.16) g were observed by adding different concentrations of mercury (Hg 2+) to the water body. The results showed that the lethal concentration (LC_ (50)) of Hg 2+ was 0.542 8,0.471 6,0.433 2 and 0.342 3 mg / L at 24, 48, 72 and 96 h, respectively. The survival rates of juvenile crabs were 96.67%, 86.67%, 73.33% and 63.33, respectively, after being kept for 40 days at 0, 0.01, 0.05, 0.10, 0.20 and 0.30 mg / L of Hg 2+ %, 56.67% and 43.33%, respectively. The weight gain rate and molting rate decreased with the increase of Hg 2+ concentration. It can be seen that Hg 2+ in water can inhibit the growth and molting of Eriocheir sinensis, and high concentration of Hg 2+ can even cause the death of juvenile crab. According to the toxic effect of Hg 2+ on Eriocheir sinensis, the maximum allowable amount of mercury in water is 0.034 2 mg / L.