中文摘要：

用氯化铵和曝气自来水设置0（对照）、40、80、120、160、200、240 mg/L共7个氨氮质量浓度梯度,进行96 h的氨氮对（12±1.6）g合浦绒螯蟹（Eriocheir hepuensis）存活和摄饵影响的急性毒性实验。结果显示：96 h40 mg/L氨氮质量浓度组蟹存活率（100%）与对照组（0 mg/L）差异不显著,但80 mg/L以上质量浓度组与对照组（0 mg/L）蟹存活率差异显著（P〈0.05）。24、36、48、60、72、84、96 h,氨氮对合浦绒螯蟹的LC50值分别为405.889、280.942、245.845、211.232、177.588、162.561、134.089 mg/L,安全质量浓度为13.409 mg/L。120mg/L组的蟹存活时间与对照组差异不显著（P〉0.05）,但与160 mg/L组蟹的存活时间差异显著（P〈0.05）。对照组与40 mg/L以上质量浓度组相对摄饵量有显著差异（P〈0.05）。

英文摘要：

A total of six ammonia-N treatments（ 40,80,120,160,200,240 mg / l） and a control（ no ammonia-N added） were set up with ammonium chloride and artificial seawater for the acute ammonia-N toxicity experiment on survival rate and food intake of Eriocheir hepuensis. The mean body mass of crab was about（ 12 ± 1. 6） g,and the experiment was for 96 h. The results showed that Eriocheir hepuensis can survive（ 100%） for 96 h in the 40 mg / L of ammonia nitrogen concentration and below,which was significant different from that of the 80 mg / L group and over,（ P 〈0. 05）. The LC50 of ammonia on the crab at 24,36,48,60,72 h,84 and 96 h were 405. 889,280. 942,245. 845,211. 232,177. 588,162. 561 and 134. 089 mg / L. And the safe concentrations of ammonia nitrogen was 13. 409 mg / L. Crab＇s surviving time of 120 mg / L group（ or the below） was not significant control group different significant from（ P 〈0. 05）,but significant different（ P 〈0. 05） from 160 mg / L group and over. The relative food intake of crab of control group and concentration over 40 mg / L groups showed significant differences（ P 〈0. 05）.