关键词: 急性毒性, 联合毒性, 重金属, 翘嘴鲌幼鱼, 生物监测

Abstract: Heavy metal pollution is one of the most hazards of environmental pollution these years in fishery. With the development of industry and agriculture, a lot of heavy metal pollutants are released through various methods into the water body. Biological monitoring can reflect the environmental pollution conditions completely, sensitively and continuously. Culter alburnus Basilewsky is a widely exiting fish all over the whole country that with highly economic value. In order to estimate the acute toxicity and joint toxicity of heavy metal Cd2+, Zn2+ and Cr6+ toward C. alburnus Basilewsky, single chemical and mixture experiments were tested in still water at (22±1)℃. Results of single toxicity tests are as following: LC50 of Cd2+ on C. alburnus in 24 h, 48 h, 72 h, 96 h were respectively 12.29, 9.56, 7.41 and 6.05 mg/L, LC50 of Zn2+ were respectively 41.92, 34.43, 27.37 and 22.23 mg/L, LC50 of Cr6+ were respectively 39.47, 32.68, 27.25 and 25.72 mg/L; the safety concentrations for Cd2+, Zn2+ and Cr6+ were respectively 0.605, 2.223 and 2.572 mg/L. Joint toxicity experiments indicated that AI>0 of the coexistence of Cd2+/Zn2+ in 24 h, 48 h, 72 h, 96 h, as well as Zn2+/Cr6+ and Cd2+/Cr6+. Every coexistence group showed synergy. Among these groups, the joint toxicity of Zn2+/Cr6+ suggested the most intensive.

Key words: acute toxicity, joint toxicity, heavy metal, Culter alburnus Basilewsky larva, biological monitoring