1. Remove excess pond sludge. After each production cycle (usually 3 to 4 years), the use of winter and spring dry and rainy seasons persists in clearing, providing an interactive platform for village officials to maintain the stability of the fish ponds and the water quality. It can retain a depth of 20 cm. Pond mud.
2. Let the bottom of the tank be completely exposed and frozen. In the fish ponds that have been dredged during the winter, the ponds can be drained for free time, allowing the bottom of the pond to be thoroughly blown, sun-dried and frozen. After sunlight and weathering, a small amount of silt on the bottom of the pond becomes relatively dry and loose. At the same time, it can also kill all pathogens and parasite eggs, improve the pond's ecological environment, improve the pond's fertility, and lay a good foundation for high yield and harvest in the following year.
3. Cast quicklime. Disposing 100 kg of quick lime per 667 square meters (1 acre) in the pond can not only kill the eggs and pathogens of fish parasites and pathogens that are potentially produced in silt, but also increase the pH value and clarify the pool water. In addition, the quicklime turns into calcium hydroxide after absorbing water, and absorbs carbon dioxide to form calcium carbonate. The calcium carbonate can make the sludge become loose structure, improve the ventilation conditions at the bottom of the pool, and accelerate the decomposition of organic matter by bacteria.
4. Fish farming and crop rotation. If there is a lack of drought and the dry pond is longer, fish farming can be combined with growing crops for crop rotation. In this way, the sludge can be fully dried and the land loosened due to the developed root system of the terrestrial crop, which is conducive to the mineralization of organic matter and better the bottom of the pool. In addition, the growing green crops can also be used as an excellent green manure for the ponds, that is, irrigation in the rainy season to flood the ponds, clearing the manure, and timely stocking the seedlings, which is conducive to fish growth and high yields and incomes.
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