Abstract

The fish fauna of Gebel Aulia reservoir (White Nile) consists of 52 species withAlestes baremoze Joannis andBrycinus nurse Ruppell dominating in numbers and biomass. The seasonality and condition ofA. baremoze, A. dentex (L.) andB. nurse are described in relation to various limnological factors in the reservoir, close to the dam. The zooplankton assemblage is small-sized, consists mainly of small Cladocera and shows striking seasonality. The hydrological regime, temperature and the grazing effect of fish are the major factors influencing its development.

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