**Histopathological Alterations in some Body Organs of Adult** *Clarias gariepinus* **(Burchell, 1822) Exposed to 4-Nonylphenol**

Alaa El-Din H. Sayed1\*, Imam A. Mekkawy1,2 and Usama M. Mahmoud1 *1Zoology Department, Faculty of Science, Assiut University, Assiut, 2Biology Department, Faculty of Science, Taif University, Taif, 1Egypt 2Saudi Arabia* 
