Poisonous effects of carbamate pesticide sevin on histopathological changes of Channa striata (Bloch, 1793)

Abstract

The study was conducted to assess the histopathological impairment of gill and liver of freshwater snakehead murrel, Channa striata. The fish were exposed to sublethal concentrations (1.1 ppm) of insecticide Sevin for 30 days and a parallel control was run simultaneously. No histopathological effects were observed in control. Gill and liver of the exposed fish exhibited some remarkable alterations in their histology. Prominent changes include vacuolation, necrosis, epithelial lifting, shortening of lamellae, the fusion of adjacent lamellae, blood congestion, architectural distortion and degeneration of gills, lamellar fusion, hypertrophy, clubbing, few lamellar missing and shrinkage of blood vessels were observed in treated fishes. Hypertrophy of hepatocytes, necrosis, blood congestion, vacuolation, cellular degeneration, damage of nuclei was observed in the liver of exposed fishes. Duration of exposure of Sevin appears to have a reflective effect on gill and liver as with the increasing duration of exposure histopathological damages become more severe.