氨氮和硫化氢对日本对虾幼体的毒性影响

本文主要研究了氨氮和硫化氢对日本对虾（Penaeus japonicus BATE）幼体的毒性作用。浓度梯度按等对数间距设置，半致死浓度采用直线内插法进行计算。实验结果表明：氨氮和硫化氢对日本对虾幼体的毒性作用显著（F〉F0.05），随着浓度的增加，各期幼体的死亡率明显升高；对各期幼体表现出不同程度的毒性作用，无节幼体对两种毒性物质的耐受性强于蚤状幼体，但是小于糠虾幼体和仔虾的耐受性。氨氮和硫化氢对日本对虾蚤状幼体、糠虾幼体和仔虾的安全浓度分别为：0．295，0．0430；0．724，0．0553；1．072，0.0705mg/L。

The toxic effect of ammonia nitrogen and sulfurated hydrogen on the larvae of Penaeus japonicus

This paper studied the effect of ammonia nitrogen and sulfurated hydrogen on the larvae of penaeus japonicus. The grades were designed by equal space between logarithm, and the median lethal concentration was computed by Linear Regression. The results showed that ammonia nitrogen and sulfurated hydrogen had a notable toxic effect on the larvae of penaeus japonicus(F>F_ 0.05), and the mortality rate of larvae increased significantly with the concentration. The endurance to two toxicants in all larvae stages was different, and the endurance of the nauplius was better than that of the zoea larvae and less than that of the mysis larvae and postlarvae. The safety concentration of ammonia nitrogen on the zoea larvae, mysis larvae and postlarvae was 0.295 mg/L, 0.724 mg/L, 1.072 mg /L respectively, and that of sulfurated hydrogen was 0.043 0 mg/L, 0.055 3 mg/L,0.070 5 mg/L.