Determination of letal concentrations (lc50) of cyflutrin and dimethoate insecticides on gammarus pulex (l., 1758)

In this study, Gammarus pulex (L., 1758) individuals obtained from Tunceli Munzur River were exposed to different concentrations of two insecticides including cyfluthrin and dimethoate. Throughout the study, physicochemical parameters such as water temperature, pH and dissolved oxygen were continuously controlled to ensure that they did not change. In this study, experiments were carried out with 0.5 liter of water in 1 liter glass aquariums. For each concentration group, 10 G. pulex individuals were used. For the determination of LC50 value, mobility conditions of living beings were observed and recorded. G. pulex, which have lost their mobility, were taken out of the aquarium and excluded from the study. The study was carried out with 3 repetitions and LC50 value for dimethoate was determined as 170.51 ± 8.15 µg/l, while LC50 value for cyfluthrin was determined as 0.800 ± 0.12 ng/l.