NOVELTY - Floating oxygenation circulator platform (OCP) for generating bottom-to-top, highly efficient fluid-to-energy, toroidal vortex flows in liquid bodies comprises sub-vortex induction mechanisms mounted on, attached to, made part of, extending out from, or placed around the body of the platform. The sub-vortex induction mechanism generates numerous complex sub-vortices as liquid flows upward past the body of the circulator platform and spreads outward across the surface.    USE - The floating OCP is used for generating bottom-to-top, highly efficient fluid-to-energy, toroidal vortex flows in liquid bodies. It functions as a rotating inverse biological contactor where liquid is set into motion rather than any mechanical device rotating into and out of the liquid; and as rotating biological contactor where microbes and nutrients are transported into and out of direct contact with atmospheric oxygen and sunlight (all claimed). It is useful for causing oxygenation and circulation in large liquid bodies (i.e. greater than 1, preferably 10-100 million gallons or larger), particularly for reoxygenation, microbial digestion, biological oxygen demand reduction, nutrient stabilization, pathogen inactivation, and large molecular degradation from exposure to UV radiation from sunlight striking the surface of liquid body. The floating OCP is for use in water remediation and water quality improvement in natural lakes and ponds, water reservoirs, stock dams, drinking water impoundments, storm water detention ponds, human waste and sewage treatment ponds, manure transformation ponds and nutrient waste treatment ponds, and industrial waste treatment facilities.    ADVANTAGE - The sub-vortex induction mechanisms initiate numerous, gentle yet complex, tumbling, swirling, rolling, roiling, or rotating sub-vortices spreading outward on the liquid surface, while avoiding turbulence, maintaining a complex, quiescent, non-violent flow, and avoiding unintended disruption to fragile microbial digestion, reproduction, and bio-floc or bio-film forming processes. The floating OCP supports enhanced oxygen transfer and reoxygenation. It increases exposure of liquid contents to UV sunlight. It brings microbes and nutrients together and into contact with each other and with atmospheric and dissolved oxygen. Return flows from the surface drag algae and other surface colonizing organisms down into the liquid where sunlight is less available. Water movement disturbs the ability of such organisms to colonize on the surface and lack of sunlight limits their ability to bloom. This helps to re-establish balance in aquatic ecosystems. Circulation transports dissolved oxygen down to the sediment layer reducing sludge deposits where exotic weeds such as milfoil take root and flourish, thus, quickly reducing their dominance in bays, lakes, estuaries, and reservoirs. Surface sub-vortices expand the exposed surface to allow absorption of more atmospheric oxygen faster. Complex surface sub-vortices enhance the exposure of pathogens and large molecules to direct UV sunlight for more effective pathogen inactivation and faster large molecule degradation. Gentle surface sub-vortex activities tumble the microbial biomass into direct contact with atmospheric oxygen to increase biomass growth and vitality beyond the limits of dissolved oxygen alone. Continuous circulation and gentle surface vortex activity brings colonies of microbes together into contact with nutrients, with oxygen and with each other to enhance the formation of numerous, complex bio-flocs and bio-films that can work together to accomplish complex microbial digestive tasks.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a floating OCP with sub-vortex induction mechanisms.