Protozoa are highly abundant in all aquatic habitats, agricultural soil and wetland habitats and they are greatly involved in food chain. In India and most specifically in Maharashtra protozoan species diversity has been rarely studied by limnologists for several reasons. In present investigation the species composition population and diversity of protozoa in water body of Ajinkyatara fort of Dist. Satara, Maharashtra, during the year 2017 is studied. When studied on annual mean basis the total number of protozoan species estimated was to be 41. It seems that if the species variety at given time is considered the ciliates count approximate 61 %, flagellates about 19.5% and rhizopods are 19.5% of total protozoan population. Throughout the year ciliates dominated the total number and in number of varieties. The average density of total protozoa found minimal in February and peak in December. The maximum concentration of protozoa was found at a region influenced by organic waste.
