【摘要】 <正> 鱼类早期发育阶段胚胎和仔鱼是整个生活史中对各种污染物最为敏感的阶段,因而许多学者强调在水质评价中利用鱼类早期发育阶段进行毒性试验的重要性。牙鲆(Paralichthys olivaceus)是我国近海重要的经济鱼类,在一些地方已开展人工养殖研究,而且对该种鱼类的早期发育过程及形态特征已有较详细的研究报道。本文利用牙鲆的受精卵进行重金属Cu,Zn,Cd,Pb和Cr对胚胎和仔鱼影响的试验研究,为海产资源的保护和环境管理提供科学依据。更多还原

【Abstract】 This paper deals with the effects of heavy metals on early life stages of flat fish. P. olivaceus embryos were exposed to seawater containing the different metal concentrations (Cu, 0.2-1.6mg/L; Zn, 2-16mg/L; Cd, 2-16 mg/L; Pb, 1-8 mg/L and Cr, 10-80 mg/L) 12 h after fertilization (Germ ring stage) till hatching. Larvae were exposed to different metal concentrations (Cu, 0.2-1.6 mg/L; Cd, 1-8 mg/L; Zn, 2-16 mg/L; Pb, 2-16 mg/L and Cr, 10-80 mg/L) for 48 h.Development retardation of embryos exposed to different heavy metal occurred. Embryos exposed to Cu, Zn and Cd showed significant decrease in hatchability and survival. Deformations observed for larvae exposed to Cu, Cd, Cr and Pb. The 48 h LC50 of heavy metals for embryos were Cu, 0.48; Zn, 6.55 and Cd, 9.01 mg/L, respectively. The results showed that fish embryos exhibited sensitivity to five metals in the following order: Cu>Zn>Cd>Pb>Cr.The 48 h LC50 of heavy metals for larvae were Cu, 0.36; Cd, 2.0; Zn, 6.7; Pb, 8.0 and Cr, 62.3 mg/L, respectively.更多还原