Determination of lethal concentration (LCR50R) values of ediphenphos on goldfish (Carassius auratus)

Over past fifty years, pesticides have been considered as a necessary component inagriculture to improve the quality and efficiency of crop production and thereforetheir aberrant and extravagant applications may be high. Ediphenphos is a componentof organophosphate pesticide which is used as a fungicide in the agricultural fields.In this study, lethal concentration (LC50) values of ediphenphos on goldfish(Carassius auratus) with mean weight of 5 ± 1 g. was investigated. This experimentwas carried out in static condition and based on instructions of O.E.C.D in 4 daysunder controlled water physicochemical factors with pH=7–8.5, DH=225 mg/l(CaCOR3R) and Temperature=27 ± 1º C. Primary experiment were performed todetermine the mortality range with introducing seven 7 fish in 20L glass aquariumwith continuous aeration. After finding the mortality range, the final experimentscarried out in a completely random trial with five concentration treatments ofediphenphos (0, 2, 4, 8 and 16 ppm) with three replications, and then based on thestatistical program Probit1.5, LC1, LC10, LC30, LC50, LC70, LC90 and LC99 valueswere measured in 24, 48, 72 and 96 in the goldfish. The results revealed LC50 96 hfor the goldfish is 4.022 mg/l. These findings suggest that edifenphos as a toxic pesticide for gold fish. In this study, clinical signs such as hunched spinal column,thrilling, and irregular swimming were observed in the studied fish specimens.

Keywords:

Organophosphore , Goldfish (Carassius auratus) , LCR50R 96 h , Pollution