Many weed varieties found in the rice paddy are good feeds for grass carp. Stocking fry at 2-3 pieces / (2-3 cm long) and fingerlings at 2-3 pieces /10 or (8-10 cm long) one month after transplanting can help control weeds, thus, reducing the needs for other weeds control techniques. As the fingerlings grow, daily supplemental feeding with green grasses is necessary to avoid damage to the young rice plants by the fish. Grass is usually fed to the fish in the pond to avoid damage to the rice plants ; while rice bran and other supplemental feeds can be directly fed to the fish in the paddy area.