Abstract
The toxic effects of cypermethrin on the ultrastructure of the gills and liver of the freshwater fish Labeo rohita's gills and liver were studied. The purpose was to see if pesticide concentrations and exposure time influenced the degree and nature of ultrascture alterations in exposed fish's gills and liver. Selected fish were exposed to a mixture of 5% concentrations of the LC50 of cypermethrin for both short and long periods of time. The gills and liver of specimens subjected to 120 hours experienced similar hyper structural alterations. Clearly indicating a harmful response to both pesticide doses. These ultra structural changes included lesions such as oedema in the primary and secondary lamellae, fusion of neighbouring secondary lamellae, and epithelial layer lifting, hyalinization, hepatocyte vacuolation, cellular swelling, and blood vessel congestion. The amount of the exposure period, however, had an effect on the degree of these hyper structural alterations.
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