The injected water must be fresh, non-polluting, rich in dissolved oxygen, and the temperature difference should not be too large. Generally, the temperature difference between the fry pool does not exceed 2°C, and the species fish pond does not exceed 5°C.
Before adding water, the original pool water in the bottom part of the pond should be drained, then the new water should be injected, and the water inlet should be filtered with a dense mesh to prevent the wild fish and enemy pests from entering the fish pond.
When the water is added, the new water is flushed along the upper horizontal line of the pool water, so that the upper layer of water can be stirred to increase oxygen.
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