At present, it is gradually entering the autumn/winter alternate season. The temperature and water temperature are continuously declining. If the overwintering management is not strengthened, carelessness will cause great economic losses to the farmers. In view of the climate conditions in our province, we will now summarize some of the prevention and control measures for cage maintenance in autumn and winter.
1, strengthen the feeding and management, enhance immunity. When the water temperature dropped to 15°C, the food intake of Astragalus membranaceus significantly decreased. When the water temperature was lower than 8°C, the feeding was stopped. To ensure safe wintering of the yellow sorghum, before the water temperature drops to 15°C, swiftly feed high-quality feeds with high fat content so that the scutellaria accumulates more fat and provide the consumption needed to stop hibernation. High-fat diets mainly include cocoons, cockroaches, fly maggots, surimi, and full-price artificial feeds. Feeding time is conducted before December, when the temperature is not too low, which is conducive to the utilization, absorption, and conversion of fatty feed for squid. Vitamins can also be added to feed to improve the self-immune jaundice, prevent sudden changes in the temperature of the emergency response, and enhance its ability to withstand cold and disease resistance in winter. When the water temperature is lower than 15°C, the feeding amount of feed should be reduced, and when the water temperature is lower than 8°C, feeding should be stopped to avoid waste.
2. Deepen the pond water level and create overwintering conditions. After entering the fall and winter season, the pond water level may decrease. In order not to affect the wintering of the astragalus, the pond water level should be controlled between 1.5 m and 2 m. This will not only maintain the pool bottom temperature, but also maintain the oxygen content of the pool water, creating an ideal overwintering condition for the astragalus.
3, timely market sales, reduce the risk of winter. After entering the fall and winter season, the price of Astragalus has gradually stabilized, and in order to reduce the risk of wintering, part of the Astragalus can be sold according to production conditions and market conditions, reducing inventory pressure and wintering risks.
4, improve the pond water quality, control the occurrence of diseases. After entering the low-temperature season, the jaundice mainly relies on drinking oxygen from the skin's breathing water. If the water quality deteriorates and the water quality is too thin, it can also cause the death of the jaundice. In November, decomposed organic fertilizers can be placed in sunny shallow water areas or in the four corners of the pond as far away as possible from cage culture areas. When the water temperature is between 13 and 18°C, Astragalus can cause a decrease in resistance due to injury or drastic changes in water temperature, and it is prone to infecting hydromycosis. The method of prevention and control: promptly removes organic matter in the cage and reduces agitation of water bodies and aquatic plants. On the first day, 0.3 to 0.6 grams of chlorine dioxide (8%) was used per cubic meter of water. The next day, 0.15 to 0.37 g of thioether sanding was sprayed on each cubic body of water.
5. Strengthen daily management to avoid icing and oxygen deficiency. After entering the autumn and winter season, we must always pay attention to weather changes, especially in the winter, the surface of the ice will easily lead to the death of the jaundice. After entering the frost weather, the water peanuts died and the grass covered about 10 centimeters could be covered with plants. If the water surface is frozen, it is necessary to remove the ice in time.
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