Invention is related to fish breeding, in particular to methods and devices for oxygenation of water in a fish-breeding pool with a closed water loop. Invention comprises a method and a device, where the water flow from a clearing block flows over a partition wall (1), then over a Zshaped gutter (4), comes into an oxygenating camera (3), limited by the Z-shaped gutter (4) and a partition wall (5), where to the Zshaped gutter (4) a netted basket (6) with filler (7), covered by a perforated plate (8) is attached. A hermetic shell (9) with a nozzle (10) for supply of oxygen covers the camera (3) over the top. Oxygen directly interacts with the water flow coming into the camera (3), then the water falls down through the filler (7) and splashes in droplets throughout the oxygen-filled free space, limited by the walls of the filler basket (6), the hermetic shell (9) and the surface of the water in the fish-breeding pool (2), creating an effect of raining. An intensive and natural oxygenation of water happens. The device can be modified and equipped by an UV-lamp, enabling simultaneous oxygenation and disinfection by the UV-radiation.
