Anti-jaundice anoxic in late autumn
1. Cooling and Oxygenation. In late autumn, the water temperature in Dianchi Lake remains relatively high, which can lead to oxygen depletion in the water. To mitigate this, shade structures made of straw or other natural materials can be installed on top of the lake. Additionally, planting climbing vegetation such as pumpkins or cucumbers around the pond allows the vines to naturally cover the surface, helping to lower the water temperature and improve oxygen levels. 2. Water Exchange for Oxygenation. Every day, a controlled amount of fresh water should be introduced into Dianchi Lake to flush out older, less oxygenated water. This process helps maintain a balanced and oxygen-rich aquatic environment, ensuring better water quality and healthier conditions for aquatic life. 3. Plant-based Oxygenation. Introducing aquatic plants like water hyacinth, water peanut, and duckweed into Dianchi Lake can significantly boost dissolved oxygen levels. These plants perform photosynthesis, releasing oxygen into the water and contributing to a more stable and healthy ecosystem. 4. Physical Oxygenation with Lime. Applying 20–30 grams of lime per cubic meter of water can help clarify the water, disinfect the pond, and improve overall water quality. This method also indirectly increases the dissolved oxygen content by reducing organic load and improving the clarity of the water. 5. Light-assisted Photosynthesis. At night, using high-power iodine-tungsten or incandescent lamps can stimulate photosynthesis in phytoplankton and aquatic plants. This artificial light source helps increase oxygen production during hours when natural sunlight is unavailable, supporting better oxygen levels in the water body. 6. Chemical Oxygenation. In high-density breeding areas, calcium peroxide or bleaching powder can be used to release oxygen through chemical reactions. A dosage of 2–3 mg per liter of water is typically recommended, depending on the specific conditions of the pond. 7. Pond Cleaning and Oxygenation. Sludge accumulation is a major cause of oxygen depletion. After the end of the autumn season or once eels have been harvested, it's essential to remove sludge from the pond. Disinfection with quicklime at a rate of 150–200 grams per square meter can help improve water quality and restore oxygen levels effectively. 8. Mechanical Aeration. For ponds with access to equipment, installing aerators can greatly enhance oxygen levels. During late fall, running aerators for 1–2 hours early in the morning can help maintain sufficient dissolved oxygen, especially in deeper or more stagnant water areas.
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