الفهرس 
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Abstract
This study was carried out to evaluate the effect of a program of artificial feeding on physical, chemical and biological dynamics in fishponds received water from different sources of water supply in three sites in Egypt. Nine fishponds, each of them was 4000m2 area, have been chosen in the three sites, three ponds in each site, these ponds have been cultured by 10000 monosex fingerlings Oreochromis niloticus from the same source of fry. They were obtained from ICLARM the World Fish Center in Abbassa. The diets were commercial contained 25% protein and obtained from the same factory through this experiment. The fish in all sites were fed by 3% of fish biomass in all the period of experiment