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Abstract

Eutrophication is a naturally occurring process of high loading of nutrients in aquatic system (particularly phosphorous) which is being accelerated by anthropogenic activities.Overuse of fertilizers, excessive feeding, untreated sewage discharge, industrial effluents, aquaculture waste are the main causative agents behind eutrophication.Eutrophication poses serious threats to aquatic flora and fauna, endangers fisheries, produces harmful algal blooms which have health impacts and deteriorates the aesthetic and recreational value of water resources.Hence, the techniques like bio-manipulation can be used as an effective tool to restore the pristine beauty of eutrophied lakes by increasing grazing pressure on phytoplankton and reducing grazing pressure on zooplankton that would leads to increase the water clarity.