Because the Tennessee Valley is located in a temperate c imate, a multiseasonal approach has been developed for culturing the t~opical fiSh tilapia. During the winter (October-March), temperature of condenlser cooling water (CCW) from open-cycle nuclear power plants ranges from 15° to b2o C, and iit is ideally suited for overwintering small fingerlings and selected fbrood stoc~. in raceways. During warmer periods of the year when CCW is too warm f r rae way culture, fingerlings are reared to market size in earthen cooling, ponds or in farm ponds near the power plant site. Hatchery methods have also b~en de eloped for mass production of tilapia and their hybrids. The integrated appro ch of overwintering, hatchery production, and growout will be discussed elat.ive to optimal use of heated effluents.