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AEMCO aeration devices aeration equipment aerator shaft aerators powered Auburn University bottom water catfish farming commercial catfish commercial fish farming continuous aeration Cooperative Extension Service cost daily feeding rates diesel diffuser aerators dissolved oxygen dlewheel efficiency electric aerator electric motors electric paddlewheel aerator emergency aeration factor feed conversion rates fish farmers fish per acre fish ponds fuel horsepower increase Indianola large ponds lb O2/hr levee levels in pond load Louisiana Cooperative Extension low oxygen conditions low oxygen levels needed night oxygen depletion oxygen transfer rate oxygenated water P.O. Box paddle depth Performance summary photosynthesis phytoplankton pond bank pond bottom pond conditions pond water portable pounds of oxygen pounds per acre power source power takeoff pump sprayer aerators rpm PTO small ponds solved oxygen speed stocking rates Surface spray aerators Table tion tractor power tractor-powered Types of Aerators units water circulation water quality ygen