In aquaculture, rotifer Brachionus sp. is the most extensively used zooplankton for rearing various marine and fresh water larval fish, during their first and second week of feeding. Production of rotifers has been dependent on the phytoplankton Chlorella which has been found to vastly improve the nutritinal quality of rotifers. Tilapisa is cultured with algae water which is known as green- water. This green-water is composed mainly of Chlorella. This study focuses on the production of Chlorella using tilapia culture at 10 ppt salinity which is the optimum salinity for rotifer production.Initial results indicate taht Chlorella production using tilapia culture is possible using all sizes of tilapia through control of stocking density and feeding rate. high density rotifer was cultured using Chlorella from this study.