| Abstract: |
The aim of the present study was to evaluate the relationship between physico-chemical parameters, seasonal variations in zooplankton and phytoplankton communities and the feeding habits of fishes. So, we chose the area of Shoubra El-Kheima as a region ofTo verify these aims we selected eight stations representing the area of study as following: - Three stations in the River Nile, three stations in Ismailia Canal and two stations in Sharkawia Canal.The obtained results during this study can be summarized as the following: -I- Physico-chemical parameters: -1- The average water temperature fluctuated between 15.2oC during Winter in Ismailia Canal and 28.2oC during Summer in River Nile.2- The highest value of transparency (101.7cm) was recorded in River Nile during Spring, while the lowest value (73.3cm) was recorded in Sharkawia Canal during Winter. The annual average value was 79.3cm.3- Hydrogen ion concentration (pH) of the water was within the alkaline side (overall average 7.5). The maximum value (7.9) was recorded in the River Nile in Winter, while the minimum one (7.1) was recorded in Ismailia Canal in Summer.4- Chemical analysis of Aluminum, Iron, Strontium, Copper, Manganese, Zinc, Barium, Lead, Vanadium and Chromium, indicated that the concentrations of these heavy metals ranged between 1.080–0.163mg/l, 1.070–0.177mg/l, 0.364–0.210mg/l, 0.300–0.002mg/l, 0.1II- Biological parameters: -1- Zooplankton: -The zooplankton assemblages during the present study was dominated by Rotifera followed by Protozoa and then to a lesser extent Turbellaria. Cladocera and Copepoda were recorded as rare forms. Scattered specimens of Ostracoda, Nematoda and Tardigrada wereThe annual average number of zooplankton was 2746.12x103 organisms/m3. It increased in Ismailia Canal especially at station M3 (3959x103 organisms/m3) in Summer and decreased in Spring also at the same canal and same station (1527x103 organisms/m3).Rotifera was the most dominant group. It constituted 56.31% of the total zooplankton community with an overall average number of 1546.32x103 organisms/m3. Rotifer organisms flourished in Ismailia Canal at station M3 (2736x103 organisms/m3) in Autumn and dThe three species; Trichocerca dixon nutalli, Tripleuchlanis plicata and Tetrasiphon hydrocora were recorded for the first time in the Egyptian freshwater.
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