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The present work revealed the destructive effects of ultraviolet radiation-A on the morphological, histological and biochemical characteristics of the early developmentalstages of Aafrican catfish, Clarias gariepinu (Burchell, 1822). These destructive effects were also studied on the developmental stages in terms of incubation time, hatching rate, mortality rate, morphological malformations and histopathological changes in some organs. The genotoxicity caused by UV-A was studied.

This work revealed the destructive effects of sublethel doses of 4-nonylphenol on the heamatological parameters, biochemical variables and hormonal activity of the adults African Catfish, Clarias gariepinus. Also, histopathological and ultrastructure studies of some organs using TEM confirmed these effects. These destructive effects were studied on the early developmental stages in terms of incubation time, fertilization rate, hatching rate, mortality rate, morphological malformations and histopathological changes using SEM. The genotoxicity of this pollutant was studied using SDS-PAGE,...