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覆沙法能降低对虾育苗池水ＣＯＤ和ＮＨ４＋－Ｎ含量，提高ｐＨ值，减轻池底污染，提高幼体成活率和单位水体出苗量。覆沙前后幼体数量无显著差异
The sand cover method can reduce the COD and NH4 + -N content of shrimp ponds, raise the pH value, reduce the pollution at the bottom of the pond, and improve the survival rate of larvae and the emergence rate of water bodies. The number of larvae before and after covering no significant difference