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The city of Bhopal is crowned with lakes and reservoirs, which are major sources of potable water, recreational activities and aquaculture. These reservoirs are under great environmental stress due to agricultural run offs, human encroachments, siltation and growth of aquatic needs. In order to maintain Upper lake as a healthy water- resource for drinking purposes, lower lake as a recreational ground for boating, water games, tourism and surface transport and Shahpura reservoir as a pisciculture station, an attempt has been made to formulate certain measures, that can cure the already spoilt lakes and check the water sheds from getting eutrophicated.

The present communication deals with the effect of inorganic phosphorus on composition and numeric strength of algae under standard test conditions.Higher concentration induced an inhibitory effect on majority of microphytes except a few viz. Microcystis aeruginosa, Merismopedia punctata, etc.