HISTOPATHOLOGICAL ALTERATIONS IN THE GILLS OF FRESH WATER FISH CYPRINUS CARPIO EXPOSED TO ACUTE LETHAL TOXICITY OF PHORATE
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 32
Abstract
The effect of acute lethal toxicity of phorate (ALTP) on the histopathology of gills of the fresh water fish Cyprinus carpio (C. carpio) was investigated in the present study. Lethal concentration (LC50) of phorate to C. carpio was determined by the Probit method of Finney and the LC50/96 hours (0.71 ppm/l) of phorate was taken as lethal concentration for acute toxicity study. Fish were exposed to ALTP (LC50/96 hours-0.71 ppm/l) for one day and 4 days and the differential acute toxicity tests were carried out under laboratory conditions. On exposure for a period of 1 day to the acute toxicity of phorate (ATP) no significant pathological changes were observed in the gills of the fish except indications of the initiation of degenerative changes. Further, on exposure for a period of 4 days to ATP, the pathological changes observed in the gills of the fish C. carpio were significant structural degeneration of primary gill lamellae, secondary gill lamellae and pillar cells along with epithelial lifting and desquamation. There was hypertrophy in the gill lamellae, erosion of surface epithelial cells and loss of lamellar structures in the gill due to atrophy of the gill lamellae. In the exposed fish, respiratory distress and abnormal behaviour were observed. On exposure to ATP, though initially caused a mild damage to the gill of the fish at day first, but further exposure to ATP for 4 days; it caused an irreversible damage.
Authors and Affiliations
G. LAKSHMAIAH
Keywords
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