本文研究了重金属Hg、Cu、Pb、Ni及Cr离子对褶牡蛎(Ostrea PlicatulaGmelin)胚胎及幼体发育的急性毒性。结果表明:这五种重金属离子对胚胎的48小时LC_(50)值依次为7、24、2520、1400、11340ppb;对幼体发育的96小时LC_(50)值分别为13、66、3590、1720、14550ppb。在96小时LC_(50)值,存活幼体的生长率分别为对照组的81.6、65.9、55.0、70.9和64.4％。从胚胎及幼体的LC_(50)值可得出:重金属离子的毒性顺序为Hg>Cu>Ni>Pb>Cr;胚胎期的敏感性大于幼体期。 This article studies the acute toxicity of Hg, Cu, Pb, Ni and Cr ions on the development of embryos and juveniles of Ostrea plicatula Gmelin. The results showed that the LC 50 value of the five heavy metal ions on the embryos was 7,24,2520,1400,11340ppb in 48 hours and 96 hours LC 50 values ​​for the larval development were 13,66,3590,1720 , 14550ppb. At the 96 hour LC 50 value, the growth rates of surviving larvae were 81.6, 65.9, 55.0, 70.9 and 64.4%, respectively, of the control group. From the embryo and juvenile LC_ (50) value can be drawn: heavy metal ions toxicity order Hg> Cu> Ni> Pb> Cr; embryo sensitivity is greater than the larval period.