NOVELTY - The wind-powered floating water aerator comprises a floating base (1) consisting of non-rottable material e.g. aluminum or plastic and water-resistant wood e.g. larch, where the aerator is driven by a half-shell rotor. A substructure contained in the floating base consists of non-rottable heat-insulating material e.g. Styrodur (RTM: Weather resistant, very light and durable polyester foam). The heat-insulating material or insulating layer prominently contributes to buoyancy, and freely maintains ice under the floating base in a required thickness.    USE - Wind-powered floating water aerator for improving oxygen content in fish ponds.    ADVANTAGE - The wind-powered floating water aerator is capable of effectively, rapidly and economically improving the oxygen content in the water with high quality and less energy consumption thus ensuring growth and health of fish stocks, and is robust and portable.    DETAILED DESCRIPTION - The wind-powered floating water aerator comprises a floating base (1) consisting of non-rottable material e.g. aluminum or plastic and water-resistant wood e.g. larch, where the aerator is driven by a half-shell rotor. A substructure contained in the floating base consists of non-rottable heat-insulating material e.g. Styrodur (RTM: Weather resistant, very light and durable polyester foam). The heat-insulating material or insulating layer prominently contributes to buoyancy, freely maintains ice under the floating base in a required thickness and is provided with corresponding recesses, which form a turbulence zone (2) protected using a baffle plate and combined with an outflow channel (3). The leeward outflow channel is closed with corresponding polystyrene beads floating on a water surface (8) and filled within plastic nets e.g. washing nets, so that air flows in dual function during operation but a thermally protected storage space exists during aerator downtime e.g. at night for the purpose of freely maintaining ice. The water aerator is equipped with a two-stage aeration turbine (4). In the two-stage execution, the water line passes in the middle of a lower turbine wreath to constantly exist water contact. An upper turbine wreath is present in the stationary water over the water surface. Initially only the lower turbine wreath is present in the water for the purpose of easy start up of the aerator. When the rotation speed increases itself due to increased drive energy, correspondingly more water is upwardly pressed, intensively swirls from the upper turbine wreath, mixes with ambient air and downwardly moves again as aerated water. The lower axially operating turbine wreath finally outwardly presses the water enriched with oxygen by the outflow channel. The swirling water is rotated in upward and downward movement constantly in a direction by the aerator turbine, virtually acts as centrifugal mass and causes very efficient energy utilization. A correspondingly larger depth effect of the aerator turbine present in the area of the water surface is found with increasing wind strength due to the increased rotation speed. The half-shell of the rotor consists of plastic. A vertical drive axle driven with the half-shell is equipped with a gear to correspondingly increase the low rotation speed of the half-shell rotor. The anchoring of the aerator takes place only on one side of the floating base, where the side is a windward side necessary for upcoming wind. The anchor acts against the wind forces on only one side of the floating base and capsize is excluded due to lateral wind gusts. The anchor is equipped with a chain swivel using a chain or wire rope for preventing over-rotation. The total length of the anchoring material is to be measured with respect to the highly-possible water level to constantly adapt the floating base with increasing and/or changing water surface.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of a floating base with functional parts.    Floating base (1)    Turbulence zone (2)    Outflow channel (3)    Aeration turbine (4)    Water surface. (8)