Determination of Letal Concentrations (LC50) of Cyfluthrın, Dimethoate Insecticides on Gammarus pulex (L., 1758)

In this study, Gammarus pulex (L., 1758) individuals obtained from Tunceli Munzur Stream were exposed to different concentrations of two insecticides containing cyfluthrin and dimethoate active ingredients, and LC50 values were determined from acute toxicity tests. During the study, parameters such as water temperature, pH, and dissolved oxygen were constantly controlled to ensure that they did not change. In this study, experiments were carried out by placing 0.5 liters of water in 1-liter glass aquariums. 10 G. pulex individuals were used for each concentration group. To determine the LC50 value, the mobility of the living things was observed and recorded in 24-hour periods. G. pulex, which lost its motility, was removed from the aquarium and excluded from the study. The study was carried out in 3 replications and the LC50 value for dimethoate was determined as 170.51 ± 8.15 µg/l, while the LC50 value for cyfluthrin was determined as 0.800 ± 0.12 µg/l.