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Effects of fipronil on freshwater shrimp (caridina japonica): Acute toxicity and acetylcholinesterase activity

Jen-Lee Yang, Liang-Hsien Chen, Ying-Chou Lee, Hon-Cheng Chen

The purposes of this study were to investigate the effects of fipronil on acute toxicity as well as on acetylcholinesterase(AChE) activity in the hemolymph of freshwater shrimp(Caridina japonica).Median lethal concentrations were determined in acute toxicity tests. The 96-h LC50 value was 0.086(0.061-0.121)g/L.During 3weeks testing period, C.japonicawere exposed to 3 different sublethal levels of fipronil(0.01, 0.02, and 0.04g/L) in laboratory toxicity tests.Adecrease ofAChE activity in hemolymph was observed, particularly at the highest exposure concentrations.