Comprehensive study has been made on the ecology and productive potential of Chando, an oxbow lake of river Manorma, Basti (U.P.)INDIA. Two years observations (From June 2010- May 2012) in terms of alterations in the physico-chemical parameters, phyto and zooplankton abundance (qualitative and quantitative), cyanobacterial diversity, macrophytes abundance, annual fish catch and icthyodiversity- orderwise including clupeiformes, cypriniformes (two division namely cyprini and siluri), beloniformes, perciformes, mastacembeleformes, cyprinodontiformes, mugiliformes, ophiocephaliformes,...