The winter of broodstock of tropical fish is usually warmed into the overwintering pool in the middle and late November. The specific time of entering the pool should be determined according to the local temperature drop situation. When a strong cold air intrusion is expected, the minimum temperature will drop below 13°C, the average temperature will be below 18°C, or the daily average temperature will drop by 8°C. Select the warm and sunny weather to enter the pool, and ensure that the fish enter the pool. Three or four warm days. Choose a deep-water pond and build a windbreak, a windproof shed. The height of the shed is generally 3 meters. The shed is erected in a row on the north of the pond, or covers the pond surface from the Tangji base in the north. Yibei is about 10 degrees from the south to the south, in order to resist the north wind's disturbance to the water surface. The broodstock or adult fish and fish fry that need to be overwinter must be transferred in the pond before winter and enter the nest for a suitable period of time. According to the characteristics of the fish species, the nesting is conducted before the winter and the management is strengthened. Before the invasion of the cold and cold air, the broodstock is stocked in a fish pond with a wide water surface and a depth of 2 to 2.5 meters. Use the remaining hot water of the power plant, sugar mill, and hot spring water to introduce fish ponds to raise the temperature of fish ponds and protect the broodstock from wintering. Before the invasion of cold wave or strong cold air, the fish ponds must be filled with water. When the pond fish have not yet gathered in groups, the water is kept warm and the fish ponds are covered with film and weeds to reduce the temperature drop of the fish ponds. During the cold wave, heaters and light bulbs were installed in the fish ponds to increase the temperature of fish ponds. Intensive cultivation before winter, feed more concentrate feed, let the fish eat, to accumulate fat, enhance the ability to protect the cold; do not catch fish and fish scattered during the cold wave; use oxygen aerator to increase the oxygen in the fish pond water. After the fish is frozen, fish ponds should be promptly cleaned up, and the dead fish should be removed. 100 to 150 kg of raw salt should be applied per mu to prevent the occurrence of hydromycosis; after the cold wave is over, the water layer should be changed gradually to deepen the water layer. Prevention and treatment.
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