nile water pollution in relation to fish health and production

Twenty four water and sediment samples (12each) collectedmonthly all over a year from September (1997) to August (1998) , as wellas two hundred forty fish samples of two species Oreochromis nilotius(Tilapia nilotica) and Clarius lazerus (Egyptian catfish) (120 each)werecolleted from the out put of Al-Serw agricultural drain into the River Nilesteam near Al-Zarka city, Dymiatta govemonwte.All water and sediment samples, as well as (12pool samples) fromeach specie (10 fishs of different sizes each) were prepared for detectingchlorinated hydrocarbons residues using Gas Liquid Chromatography.The analysis was conducted in the laboratory of Residue Analysisof pesticides and Heavy metals infood in, Ministry of Agriculture andReclamation, Egypt.’The obtained results were :-(AJ W41er Samples-:/1) The detected chlorinated hydrocarbons in water were alpha-y hexachlorocyclohexane (a-HCH); p,p-dichlorodiphenyl ethane(p,p-DDE); o,p-dichlordiphenyl trichloroethane (o,p-DDT); p,p-Dichloro-diphenyltrichloraethane (p,p-DDT) and Hexachloro-cyclobenzene (HCB)in different levels.(2) The monthly highest value of a - HCH (0.0094J..lg/L) wasdetected in December and February, While the lowest valuewas (0.0060J..lglL) detected in July and September with overallmean value ofI-HCB was (0.008J..lg/L).