Acute toxicity of Roundup and carbosulfan to the Thai fairy shrimp, Branchinella thailandensis.

The potential risk of herbicides and insecticides sprayed near pools to non-target fairy shrimp has not been assessed in Thailand. The acute toxicity of Roundup (isopropylamine salt 48% w/v) herbicide and carbosulfan (2,3-dihydro-2,2-dimethylbenzofuran-7-yl (dibutylaminothio) methylcabamate 20% w/v) insecticide were evaluated in 6 hours, 12 hours, and 24 hours static bioassay using nauplii fairy shrimp, Branchinella thailandensis. Median lethal concentration (LC50) values were calculated after probit transformation of resulting data. Median 24 hours lethal concentrations were 0.319 and 0.702 ppm for Roundup and carbosulfan, respectively.