1. With water overwintering method. Astragalus is a variable-temperature, cold-blooded fish with a strong adaptability to the environment. When the temperature falls below 10°C (growth temperature 15°C to 30°C), it rarely feeds and enters a hibernation, and in order to safely survive the winter, the aphid should be cultured. The water level of the pool is increased to 30-50 cm, ensuring that the water temperature at the bottom of the pool is above 0°C in winter. If the pond is frozen, the ice must be opened every day to prevent hypoxia.
2. Dry pool wintering method. When the water temperature is below 10°C, the pool water is drained to ensure that the bottom of the pool is moist. The surface of the pond's soil is covered with a layer of rice straw or wheat straw and corn stalk, with a thickness of 30 cm.
3. Indoor wintering method. When the temperature is below 10°C, transfer the pond yellowtail to indoor wintering. In the indoor pool or bucket, place 1 kg of astragalus and 2 kg of water into the tank or bucket and change the water once a day. The room temperature is between 2°C and 5°C.
4. Plastic greenhouse wintering method. When the winter water temperature is lower than 12°C, the use of plastic greenhouses is also very effective for wintering. The water level in the plastic greenhouse is slightly higher than the aquaculture water level. The temperature in the shed is guaranteed between 2°C and 8°C. At the highest temperature at noon every day, the ventilation holes of the greenhouse were opened, so that the air in the greenhouse was fresh, and ventilation holes were installed at the top of the greenhouse to prevent the oxygen deficiency of the yellow beans.
2. Dry pool wintering method. When the water temperature is below 10°C, the pool water is drained to ensure that the bottom of the pool is moist. The surface of the pond's soil is covered with a layer of rice straw or wheat straw and corn stalk, with a thickness of 30 cm.
3. Indoor wintering method. When the temperature is below 10°C, transfer the pond yellowtail to indoor wintering. In the indoor pool or bucket, place 1 kg of astragalus and 2 kg of water into the tank or bucket and change the water once a day. The room temperature is between 2°C and 5°C.
4. Plastic greenhouse wintering method. When the winter water temperature is lower than 12°C, the use of plastic greenhouses is also very effective for wintering. The water level in the plastic greenhouse is slightly higher than the aquaculture water level. The temperature in the shed is guaranteed between 2°C and 8°C. At the highest temperature at noon every day, the ventilation holes of the greenhouse were opened, so that the air in the greenhouse was fresh, and ventilation holes were installed at the top of the greenhouse to prevent the oxygen deficiency of the yellow beans.
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