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Lake ecosystem is marked as a peculiar type of ecosystem. The different lakes vary in the trophic status ranging from oligotrophic to eutrophic. This trophic status is mainly the assessment of the human intervention in the lake or in the catchment area. This directly affects the productivity or the nutrient load in the water. The lakes all around the world have shown the sign of increasing eutrophication during last two to three decades. Today the need is to properly monitor the changes in the physico-chemical characteristics and the biological counter parts of the lake water. The need is also to constitute proper measures for the management and conservation of lakes. The present study of Anasagar lake gains importance because of its location in the heart of the Ajmer city.

Keywords: Ecosystem, trophic status, oligotrophic, eutrophic, physico chemical characteristics, management, conservation.