This is in order to oxidize any non-decomposed organic material that may have built up on the pond floor, such as fish feed or droppings from the fish.

• 此举的目的是氧化积聚于塘底而未曾分解的有机物质,如鱼粮或鱼类排泄物等。这样做可风乾塘底,维持鱼塘的水质。