Histopathological effect of Diazinon Poisoning in rainbow trout fry (Oncorhynchus mykiss)

The aim of this study was to evaluate histhopathological effects of diazinon on liver and gill tissues in rainbow trout fry and was performed in the Fisheries and Marine Science Center doctor keyvan (Islamic Azad of University, Chamkhaleh port). The presence of diazinon, an organophosphorous pesticide, in rivers near the paddy fields has been reported by some authors. During 20 days 120 pieces of rainbow trout fries were exposed to three different concentration of Diazinon including 25, 50 and 75 percent of LC50 (LC50=1.65 mg/lit) in 3 experimental groups and one blank group (by three times replicates) by O.E.C.D method. The histhopathological effects of diazinon on liver and gill tissues were examined by light microscopy.bile stagnation, cell necrosis, fatty degeneration, atrophy of cells were observed in the liver tissues of fish exposed to diazinon. Also the changes in the gill tissuewere, congestion, Gills hyperplasia, adhesions of Lamlahay secondary, Clubbing lamella infish treated pesticide Diazinon.Histopathology of these changes significantly increased withincreasing concentrations of toxin.