The effect of different levels of malathion (Malathion) on lethal concentrations (LCR50R 96 h), hematocrit and clinical signs of white fish (Rutilus frisii kutum)

Publish Year: 1393
نوع سند: مقاله کنفرانسی
زبان: English
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ICII02_072

تاریخ نمایه سازی: 7 تیر 1399

Abstract:

Pesticides are used in agriculture to control pest and also protect the human healthand animals. Excessive use of pesticides put human health at risk and threaten nontargetorganisms, polluting water, soil and air are. Malathion is a component oforganophosphate pesticide which is used as a fungicide in agricultural fields. At thepresent study, lethal concentration (LC 50) of malathion was calculated for Rutilusfrisii kutum with a mean weight of 3 ± 1 [mean ± SD] g. The experiment were carriedout in static condition and based on instructions of O.E.C.D in 4 days under controlledwater physicochemical factors with pH = 7–8.5, DH = 215 mg L-1 (CaCO3) andtemperature = 24 ± 1 °C. Primary experiments were performed to find the mortalityrange of the specimens by introducing 10 fish in 25 L glass aquarium with continuousaeration. After finding the mortality range, the final experiments were carried out ina completely random trial with six concentration treatments of malathion (0, 0.5, 1,3, 5 and 10 mg L-1) with three replications. Data were analysed using the probitanalysis. LC1, LC 10, LC30, LC50, LC70, LC90 and LC99 were calculated in 24, 48, 72and 96 hours. Our results indicated that LC50R96-h for Rutilus frisii kutum is 0.86 mgL-1 . These findings suggest that malathion has a high toxicity for Rutilus frisii Kutum.In this study, the hematocrit decreased significantly with increasing concentrationsof the malathion with the concentrations of 0.2, 0.3 and 0.5 mg L-1 being significantlydifferent from the controls. Clinical symptoms including irregular protrusion of theeyes and irregular swimming were observed.

Authors

Saeid Shahbazi

Fisheries Dept., Faculty of Natural Resources, University of Tehran, Karaj, Iran

Hadi Poorbagher

Fisheries Dept., Faculty of Natural Resources, University of Tehran, Karaj, Iran

Hamed Ghafari Farsani

Fisheries Dept., Faculty of Natural Resources, University of Tehran, Karaj, Iran

Amin Khazaei

Fisheries Dept., Faculty of Natural Resources, University of Tehran, Karaj, Iran

Elahe Chaharde Baladehi

Fisheries Dept., Faculty of Natural Resources, University of Gorgan, Golestan, Iran