A system for efficiently circulating water in a large volume of rearing spacefor aquaticorganisms, comprising an impervious enclosure for containing the water andaquatic organismsand a pump for pumping water from an intake duct through intake ducting to aflow diverter,which then directs a flow of water radially outward within the enclosure todirectly induce acirculation of water within the enclosure. The center drive circulationpattern is sufficientlyuniform to provide optimum rearing conditions for cultured finfish, while alsoensuring thatsolid wastes are swept toward the central drain, even in a very large tank.
