To properly maintain high-yield fish ponds, it's essential to ensure the water level reaches approximately two meters. This helps in maintaining a stable environment for the fish and supports optimal growth conditions. After harvesting the fish, it's important to drain the pond water to a depth of about 20 cm, allowing the bottom to dry out and reducing the buildup of organic matter and silt.
For disinfection, it's recommended to use appropriate chemicals such as lime or bleach. A common method is dry disinfection: first, drain the pond to a depth of 10 cm, then dig several small pits at the bottom. Apply 60 to 80 kg of quicklime per 667 square meters, spreading it evenly across the pond floor. For complete water disinfection, use 125 to 150 kg of lime per 667 square meters and thoroughly spray the entire pond. It’s best to perform this process about 10 days before restocking the fish, and choose a sunny day with higher temperatures for better effectiveness.
Before introducing new fish, it’s wise to conduct a test. Take a sample of the pond water and place a few test fish in it for 12 to 24 hours. If the test fish show normal behavior and no signs of distress, it’s safe to proceed with stocking the pond. This step ensures that the water quality is suitable and reduces the risk of disease or stress in the newly introduced fish. Always monitor the pond regularly after stocking to maintain a healthy aquatic environment.
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