NOVELTY - The water recirculation plant for pisciculture and fish feeding, has water distribution assembly, flooded bioreactors (6) for microbiological water nitrification, sedimentation filters (4, 8), fish basins (2), and a pump chamber in which a water supply plant is built. The recirculation water from an elevated container unit is supplied to the fish basin via water distributors. The water supply plant supplies the water distributor basin (16) with process water in order to flow pressure-free water through flow lines.    USE - Used for pisciculture and fish feeding.    ADVANTAGE - The water recirculation plant is simple, cost effective and has low operating cost.    DETAILED DESCRIPTION - The fish basins, bioreactors and sedimenters are built subsequently, and the sedimenters possess inlet and discharge mechanisms and collect the resulting excrement in the integrated chambers (14) through built-in slanted honeycomb channel sections. The resulting excrement is disposed over sludge washout slide valves, and the prepurified process water flows back into the pump chamber through the built-on feed back flow lines, which are arranged somewhat lower than the inlets. The flow of the oxygen-rich water in the water distributor basin permanently over the drop plates as well as to the fish basins and the bioreactors takes place through tilting pipes, shut-off devices and throttle valves. The volume control of the water supply to the fish basins and to the bioreactors takes place via tilting pipes. The bioreactors are present at the same level, which are filled with loose buoyant bulk material and exhibit hermetic partition walls, which forcibly lead the process water downwards or upwards between the inlet and discharge mechanism. Fine air bubbles are blown through ventilation ducts over pipelines to chamber in the bioreactors to supply the bulk material into a rotary motion. The fish basins are at the same height as that of the bioreactors and the water supply takes place from the bottom of the fish basins over hole openings through perpendicularly standing discharge pipe and from there the water flows without any further downward gradient into the sedimenter. In the water recirculation system, two sedimentation filters are installed at the same height as that of the fish basins and bioreactors. The height of the discharge or overflow ensures the gravitational flow and carries out the disposal of the sludge sediment over slide gate valve. Tubular coagulation bodies, which are opposite to the flow direction in the diagonal angle and exhibit anoxic zones exhibiting carbon compounds. The tubular coagulation bodies are built in the sedimentation filters and the slanted honeycomb channels, in order to accommodate denitrifying bacteria (Nitrococcus Denitrificans) on the coagulation substrate, which are capable of taking up the accumulating nitrate and converting it into elementary nitrogen, which in turn escapes into the atmosphere. Fixed bevels, which are concealed in the pump chamber, hermetically sealed up to the bottom and which exhibit a diagonal angle that allows the sludge to slip away during the rinsing procedure, are brought into the fish basins, bioreactors and sedimenters. Separating spaces or cavities are arranged between the individual fish basins, the bioreactors, the sedimenters and the pump chamber. The fish is removed through a sluice opening. Process water is fed only at one place, and all the further flow lines to the fish basins, the bioreactors, the sedimenter and pump chamber takes place via gravitation.    DESCRIPTION OF DRAWING(S) - The figure shows water recirculation for pisciculture and fish feeding:    Fish basins; (2)    Sedimentation filters; (4, 8)    Bioreactors; (6)    Integrated chambers; (14)    Water distribution basin. (16)