Acute Toxicity of Seven Pyrethroid Insecticides to Brine Shrimp Artemia
7种拟除虫菊酯农药对卤虫的急性毒性研究

To study the acute toxic effects of seven pyrethroid insecticides on the Great Salt Lake (GSL) Artemia, Artemia nauplii hatched out within 18-24 h were picked out, and then continued to be cultured for another 24 h under the same condition to obtain the 2nd-3rd instar nauplii. The obtained GSL Artemia were exposed to different concentrations of pyrethroid solutions for 24 h, and the lethal effects were recorded. The results of Probit analysis showed that lethal effects of the seven studied pyrethroids on GSL Artemia were very different from each other. The 24 h median lethal concentrations (24 h-LC50) of permethrin, chlorenthrin, imiprothrin, tetramethrin, bifenthrin, lambadacyhalothrin, deltamethrin to brine shrimp were 4.68, 14.82, 18.12, 38.21, >100, >100, >100 mg·L-1, respectively. Therefore, in the Artemia-living saline environment, the pyrethroid insecticides with relatively lower toxicity including bifenthrin, lambadacyhalothrin and deltamethrin should be given prior consideration rather than the highly toxic permethrin.