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Methods and Technical Key Points for Clearing and Preparing Broodstock Rearing Ponds

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1. Renovating the pond: Drain the pond water, remove excess silt, level the pond bottom, repair the pond bottom walls and the water inlet and outlet, and clear tall plants from the pond bottom and edges. After exposing the pond to sunlight for several days, fill it with fresh water. 2. Common pond-clearing methods include (1) Quicklime pond clearing. One method is dry quicklime pond clearing, that is, first drain the pond water, leaving only 6-10 cm of water on the pond bottom, dig several small pits around the pond bottom, place quicklime separately into the small pits, add water to dissolve it, and before it cools, splash it evenly over the pond. On the 2nd day, an iron

1. Renovating the pond: Drain the pond water, remove excess silt, level the pond bottom, repair the pond bottom walls and the water inlet and outlet, and clear tall plants from the pond bottom and edges. After exposing the pond to sunlight for several days, fill it with fresh water.

2. Common pond-clearing methods include (1) Quicklime pond clearing. One method is dry quicklime pond clearing, that is, first drain the pond water, leaving only 6-10 cm of water on the pond bottom, dig several small pits around the pond bottom, place quicklime separately into the small pits, add water to dissolve it, and before it cools, splash it evenly over the pond. On the 2nd day, an iron rake must be used to rake the pond mud so that the lime slurry and silt are fully mixed. The quicklime dosage is generally 50-75 kg per 667 sq m. Another method is pond clearing with water retained, that is, the pond water is not drained, and the dissolved lime slurry is splashed over the entire pond. The quicklime dosage is 125-150 kg per 667 sq m at a water depth of 1 m. (2) Bleaching powder pond clearing. The bleaching powder generally used has a chlorine content of about 30%. For dry pond clearing, the dosage is 5-10 kg per 667 sq m; for pond clearing with water retained, the dosage is 13.5 kg per 667 sq m at a water depth of 1 m. The method of use is to dissolve the bleaching powder in water and immediately splash it evenly over the entire pond.

3. Tea seed cake pond clearing: Break the tea seed cake into small pieces, soak them in water, and they can be used after soaking for 1 day and night at a water temperature of about 25°C. The dosage is 40-50 kg per 667 sq m at a water depth of 1 m.

4. Ammonia water pond clearing: At a water depth of 10 cm, use 50 kg of ammonia water per 667 sq m of pond. When using, add several times its amount of dry pond mud, stir evenly, and splash it evenly over the entire pond. When using the above drugs to clear ponds, it is generally necessary to wait 7-10 days for the drug effect to disappear before broodstock can be stocked.

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