The effects of the different concentrations of Thiodan® on the mortality rates of Gambusia affinis and Gammarus pulex.

In this study, the acute toxicity of thiodan(R) on Gambusia affinis (Cyprinidontidae: Pisces) and Gammarus pulex (Amphiopoda: Crustacea) have been examined. In acute toxicity tests, the LC,, values at 24, 48, 72 and 96 hours were investigated for Gammarus Pulex exposed to Thiodan(R) concentrations of 0.00 (control), 0.25, 0.5, 0.75, 1.0, 2.0, 5.0, 7.5, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0, 50.0, 100.0 mu/lt. The 24, 48, 72 and 96 hours LC50 values were determined as 10.641, 8.755, 4.544 and 3.248 mu/lt, respectively. Moreover, LC50 values at 24, 48, 72 and 96 hours were investigated for Gambusia affinis exposed to Thiodan(R) concentrations of 0.00 (control), 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 5.00, 10.00, 12.5, 15.0, 17.5, 20.0, 30.0, 50.0, 100.0 dir. The 24, 48, 72 and 96 hours LC50 values were determined as 14.415, 12.077, 10.035 and 6.116 mu/lt, respectively.