الفهرس 
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Abstract
The present study aims to determine quantitatively and qualitatively zooplankton in each of the three water bodies, Lake Nasser, Aswan Reservoir and the River Nile; to detect spatial and temporal variations in the distribution of zooplankton; and to relate the detected variations to the measured environmental variables. Investigating physical and chemical characteristics was essential to understand their relation with zooplankton during the different seasons. Sampling of zooplankton in Lake Nasser was performed seasonally during the period from February, 2000 to January, 2001. Seven stations were selected in the main stream of Lake Nasser to represent the different habitats, namely; ElRamla, Kalabsha, WadiAbyad, ElMadiq, Singari, Tushka, and Adindan. Besides, three main khors, namely; Khor Kalabsha, Khor Singari and Khor Tushka. Sampling of zooplankton in Aswan Reservoir and the River Nile was performed monthly during the period from September, 1999 to August, 2000.The community composition of zooplankton population in Lake Nasser comprised three main groups, namely; copepoda, rotifera and cladocera. They constituted about 62.2%, 22.6% and 15.2% of the total zooplankton, respectively. Copepoda was dominant in the lake. Zooplankton population in Aswan Reservoir and the River Nile at Aswan also comprised; Rotifera, copepoda and cladocera represented in Aswan Reservoir about 49.7%, 37.6% and 12.7% of the total zooplankton, respectively. They represented in the River Nile about 70.2%, 19.6% and 10.2% of the total zooplankton, respectively. Rotifera was dominant in Aswan Reservoir and the River Nile. Thermocyclops hyalinus dominated the adult copepods in Lake Nasser. While, Thermodiaptomus galebi was abundant in Aswan Reservoir and the River Nile. Keratella cochlearis dominated the rotifers and Bosmina longirostris was dominant among the cladocerans in the three investigated areas.