A floating oxygenation circulator platform (OCP) is disclosed employing sub-vortex induction to initiate numerous, gentle yet complex, tumbling, swirling, rolling, roiling or rotating sub-vortices spreading outward on the liquid surface. The circulator platform itself sets in motion a non-turbulent, high efficiency, bottom to top, primary toroidal vortex flow. Varied sub-vortex induction mechanisms mounted on, made part of, attached to, extending out from or placed around the body of the circulator platform, induce sub-vortices to increase the surface exposure of the liquid and its contents to atmospheric oxygen and UV sunlight. The OCP and its sub-vortex induction mechanisms taken together act in the manner of a Rotating Inverse Biological Contactor (RIBC), labeled “inverse” because the liquid itself rotates and tumbles its contents into direct contact with the atmosphere and with sunlight, in contrast to RBC devices where solid disks rotate in and out of a liquid.