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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,...

Epinephelinae, represent one of the most important families in the Egyptian sector of the Red Sea Epinepheline or grouper are abundant, valuable and economical fish food. The present work has been suggested due to the rarity of biological, population dynamics, stock assessment and fisheries studies with respect to three Epinepheline species, Cephalopholis argus, Cephalopholis miniata and Variola louti from the Red Sea at Al- Quseir south of Hurghada by 140 Km, Egypt. The present work is a part of a project executed in Assiut University to study the biology and fisheries of the Red Sea fishes,...