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In the present investigation zooplankton density was conducted of river Ganga between Parmat ghat upto Jaimau bridge covering an area of 10 km during July 2002 to June 2003. Monthly samples were collected from the sites of Parmat ghat, Golla ghat and Ganga bridge (Jajmau). It was observed that zooplankton density was maximum during summer and minimum during rainy season at all the selected sites. Qualitative zooplankton fauna belongs to different groups i.e. protozoans, rotifers, cladocerans and copepods. Dominant zooplankton were Paramecium sp., Brachionous sp. Filinia sp. and Keratella sp. From the present study it can be concluded that the Water quality of river was responsible for qualitative and quantitative variation in Zooplankton at the sites Studied.