The present study deals with the composition and abundance of Rotifera in a tropical lake of Belgaum city. Rotifera (14 species) comprised the dominant zooplanktons of the highly polluted lake. This group formed 52.38 and 54.6 percent of total zooplanktons   during 1998 and 1999 respectively. Maximum population density was recorded during summer and minimum in monsoon during    the study period. Brachionus (four species) constituted the dominant genus, followed by Keratella (two species), Filinia , Asplanchna, Polyarthra, Trichocerca as sub-dominant genera. Other two genera Ascomorpha and Anuraeopsis were   found in very low numbers in the lake. The possible reasons for the fluctuations   in the physico-chemical factors of the lake have been discussed.

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