High intensity flow-through systems may offer significantly lower capital and operating costs over reuse systems if water requirements can be reduced. The water requirements in intensive marine culture are controlled by the oxygen demand, and the impacts of excreted carbon dioxide, pH, and suspended solids. Typically, dissolved oxygen is the most limiting parameter. In high intensity systems, pure oxygen aeration systems offer many operational advantages over other types of aeration. Reductions in pumping costs and improvements in transfer efficiency are needed to improve the economics of pure oxygen aeration.