Abstract: Method and apparatus for producing an oxygenated fluid. In accordance with various embodiments, a vessel of water is provided for housing a population of fish. A stream of oxygenated water is generated to have a dissolved oxygen content of at least about 70 milligrams/liter (mg/l). The stream of oxygenated water is diluted with a second stream of water to provide an output stream with a dissolved oxygen content of from about 5 mg/l to about 14 mg/l. The output stream is injected into the vessel to maintain the population of fish.

Abstract: Method and apparatus for producing an oxygenated fluid. In accordance with various embodiments, a flow of pressurized fluid is established. A flow of oxygen is injected into the flow of pressurized fluid to provide a fluid/oxygen mixture. The mixture is passed through a venturi assembly in the presence of a magnetic field established by an adjacent magnetic assembly. The mixture is next flowed from the venturi assembly to a gas/liquid separation tank, where a liquid component of the mixture is passed downstream with a selected dissolved oxygen content and a gas component is directed back for injection into the pressurized fluid flow.