The main advocates are Elodea, Vallisneria (grass), and Hydrilla verticillata (knotted grass) as the supplements. The water grass coverage rates are 30%, 10%, and 10%, respectively, and the total coverage is controlled at about 50%. After the first clamshell of crab species is completed, the paddy fields must be promptly filled with water. The water depth is controlled at 10 to 20 cm in the early stage. The Elodea and Heihe algae are transplanted and the bittergrass is planted. After the roots are set, the water level is gradually increased. Raise to less than 40 cm. The water grasses are planted in the east-west direction and in the sliver style. The purpose is to provide habitats for shrimps and crabs to shelter their enemies from the enemy's places and activities, and to avoid as much as possible the influence of wind and waves.
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