三唑酮对青鳉鱼和大型溞不同测试终点的毒性效应评价

Toxicity effect of Triadimefon based on Oryzias latipes and Daphnia magna with different test endpoints

以青鳉鱼和大型溞为代表性水生生物,研究三唑酮对其不同测试终点的慢性毒性效应.结果显示,以生存、生长、繁殖为测试终点,青鳉鱼的NOEC分别为76,60,5μg/L,基于大型溞蜕皮次数、生长和繁殖的NOEC分别为25,100,200μg/L.由此可见,青鳉鱼比大型溞对三唑酮的毒性更敏感.比较不同测试终点,青鳉鱼的繁殖类指标最敏感,其次是生长、生存;相比大型溞的繁殖以及幼溞的生长,其幼溞的蜕皮次数指标更为敏感.因此,低剂量长期暴露下三唑酮会对水生生物的繁殖能力造成一定的损伤,评价其水生态安全应全面考虑不同生物种群的不同测试终点,尤其是鱼类繁殖毒性效应.

Triadimefon is one of the most widely used broad spectrum bactericides at the present. Although the acute toxicity of triadimefon is lower, it would accumulate persistently in the water environment and cause adverse effect to aquatic organisms due to its consistency and adsorption. Sub-chronic toxicity of different endpoints for Oryzias latipes and Daphnia magna were conducted to evaluate aquatic ecological effect of triadimefon. The result showed that the NOECs of triadimefon based on the survival, growth and reproductive of Oryzias latipes were 76, 60, 10μg/L respectively. While the NOECs based on the molt, growth and reproductive of Daphnia magna were 25, 100, 200μg/L, respectively. Oryzias latipes was more sensitive than Daphnia magna to triadimefon. For the view of different endpoints, reproduction was the most sensitive endpoint of Oryzias latipes to triadimefon, followed as growth and survival. For Daphnia magna, the growth and molt were more sensitive than reproduction. Therefore, it would cause reproductive fitness to aquatic organisms under low dose long-term exposure of triadimefon. Different endpoints for kinds of species, especially for reproductive toxicity of fish should be considered in the ecological risk assessment of triadimefon.