The invention is characterized by rotating tubes with an inner, screw-shaped worm or by pumps which are predominantly driven by wind and solar energy, pumping water upwards, causing it to trickle down in the form of drops, enabling the water thus aerated to flow outwards at a predefined depth. The circulation of water around an island installation ensures that said water is pressed into a removable wall and is purified (filtered). The fish soon fall into a catching basket located in the water as a result of the heavy current in the narrowly reduced living area of the fish in the final part of the farming basin. Young and small animals can be allowed to escape by adapting net size.