摘要：

The main aim of the Egyptian government is not only to increase the fish production from the different resources, particularly from aquaculture, but also to improve the quality of the fish produced. One of the main factors which affect the quality of fish is the water quality. Therefore, the present study aims to investigate the impacts of different water resources on the quality and production of Oreochromis niloticus fish reared in two different farms at EL-Abbassa, Sharkia governorate, Egypt. While the first farm uses irrigation water from Ismalia Canal, which is the branch of the river Nile, the other uses agriculture drainage water. Water samples were taken randomly from different ponds of each farm every week for two season (winter and spring) to evaluate the physical, chemical and biological characteristic of the two types of water, sample of fish were taken one time at harvest for measuring heavy metals load on (fish muscle and liver) and measuring condition factor, gonadosomatic index and pesticides in fish muscle, gills and liver .The heavy metal load and pesticide residuals in the fish tissue and water were also measured. The results obtained show significant differences between the two water types, particularly in their physical and chemical characteristics (pH, NH3, NH4, O2, salinity, electric conductivity, transparency, total alkalinity, total hardness, available phosphorus and nitrate). Phytoplankton communities showed higher significant density in the ponds that received agriculture drainage water compared to those received irrigation water. There were significant variations in the concentrate of (Fe, Zn, Cu, Cd and Pb) and different pesticide contents of the different fish organs as well as their gonadosomatic index (GI), and condition factor.

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