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Abstract
Fish is an important source of animal protein for human consumption; its nutritive value and price have lead to the expansion of fish culture.Six experiments were applied on Nile tilapia (Oreochromis niloticus), common carp (Cyprinus carpio) and cat fish (Clarias gariepinus) to investigate the effect of some environmental problems facing these fishes.The effect of sudden change of water salinity on survival of (Oreochromis niloticus)The effect of sudden change of water salinity on survival of (Cyprinus carpio) The effect of sudden change of water salinity on survival 0f (Clarias gariepinus)The effect of salinity on growth performance of (Oreochromis niloticus) •The effect of acute and sub lethal toxicity of chlorine on health condition and growth performance of (Oreochromis niloticus)The effect of addition of salt on different levels of nitrite concentration in (Cyprinus carpio)brDetection of histopathological lesions and serum cortisol levels produced by those diseases).