【摘要】 本文报导了静态条件下在沈家门渔港天然海水中外加铜、锌、汞、柴油、机油和丙体666等六种有毒物质,测定其对海蛰（Rhopilema esculenta Kishi-nouye）幼体——碟状体阶段的24、48和96小时半致死的浓度(LC₅₀)值。并应用这些急性毒性资料,探讨了海蜇资源下降的污染方面原因。更多还原

【Abstract】 This paper neports the nesults of acute toxicity tests with ephyra of jellyfish by six pollutants (Cu2+, Zn2+, Hg2+, diesel oil, lubricant and Y-benzyl hexa-chloride). These pollutants are added respectively into each container containing natural sea water from fishing harbor of san Jia Men, then ephyras are put into them. These tests was done under static condition in laboratory. 24h, 48h and 96h median lethal concentration (LC50) values for these pollutants to the ephyra of jellyfish are obtained.Acceding to these LC50 values, the toxicity of these pollutants to the ephyras is compared, and the ephyra is compared with the main groups of marine organisms.Based on these results, veasons why jellyfish yield in Zhejiang province dicreased are discussed.更多还原