The best result was achieved at a sewage water load of 100 m3/ha/day. With 100 m3/ha/day sewage water during the culturing period, 400-600 kg nitrogen and 80-120 kg phosphorus was introduced into the pond system.
In a properly operating system, the elimination of 80-90 percent of phosphorus and nitrogen load is warranted.
With the stocking structure described, 1.8-2 t/ha net output could be achieved at a 100 m3/ha/day sewage water load.