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Abstract
In Egypt. tilapiane fish represented one of the most common’pe i in the river ile nod numerous lakes, Tilapiane speci are extr mely recomm nded a one of successful culturing fish a sh y primarily e hibit excellent grO\ rh rate’ even on low prot In diet - They Also tolerate wider range’ of environmental c nditions. Moreover. they ale highly and widely acceptable as f ad because of their high delicacy by a huge number of people throughout the
world, onsequently p ciaI interest has b en given (0 study th
physiological, genetical and nvironmeueal conditions related to
improv Tilapia production (Pflllill (iml j’J1ecmmell, 1982).
Pollution of livers and tream with chemical contaruinanrs
has become one of tile mo I crucial environmental problem within
the _Olb cenrury. Water home chemical pollution entering rivers and
streams cause tremendous amount of destruction,
The impact of mas ive ch mical pollution on the biochemical
quality of the aquatic environment has greatly stimulated research on
rhe biological effects of potentially dangerous lib lances, commonly
discharged as waste from indu trial complex> or agricultural
a. tivitie bodie ’. TIle variety of pollurann . particularly heavy metals
which are known to be toxic 10 human beings as well as to aquari
organisms are enorm 11” Bioaccumulation of heavy metals in fish
may critically influence both growth rate and quality of fish
odsoa eI.