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Physico-chemical characteristics and phytoplankton diversity of polluted and unpolluted sites of Lake Anasagar was studied. Different sites showed marked differences in some of the characteristics like pH, Cl, Ca, Mg, Total N, P, Free Co2, DO, TDS, DOM. In all 123 algal species belonging to 60 genera were recorded for this wetland. Out of these Achnathes hungarica, Ankistrodesmus falcatus, Chlorella vulgaris, Chlorococcum infusionum, species of Euglema, Microcystis aeruginosa, species of Navicula and Oscillatoria, Pandorina morum, Pediastrum tetras, Scenedesmus quadricauda and Stigeoclonium tenue were recorded as indicators of pollution. The floristic diversity may be utilized for trophic assessment of this wetland.

Key words: Physico- chemical characteristics, Phytoplankton, Wetland, Pollution, Trophic assessment.