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Macrobenthic invertebrate’s species are differently sensitive to biotic and abiotic factors in their environment. Consequently, they have commonly been used as bioindicators of the conditions and water quality of aquatic ecosystems. During the period from spring 2007 to winter 2009, eleven stations in the River Nile; from Aswan to Cairo were selected to study the impact of water quality conditions on the macrobenthic invertebrates associated with aquatic macrophytes.

The study revealed that thirty seven species belonging to Arthropoda (19 species), Mollusca (12 species), Annelida (5 species) in addition to fish fries were also encountered, contributing about 52.78%, 38.54%, 9.52% and 0.05% of the total benthos density respectively. The highest values of macrobenthic invertebrates were recorded during autumn 2008, while the lowest were recorded during spring 2007. The distribution and seasonal variations of each collected group and its dominant species were discussed. They showed closely relationship with water quality parameters of the River Nile.