Spring Management of Astragalus Breeding

As the saying goes: "The season of the year is spring." Doing a good job in spring management is one of the conditions for the successful breeding of Astragalus. The following author combined with practice to talk about the management points of spring aphid breeding:

1. Ready to work. Before and after Ching Ming, when the water temperature is generally stable above 10°C, preparations can begin. The first is to clean the environment around the culture ponds and then disinfect the drugs. The method is to make a 50 g/L saturated lime solution with quicklime, filter out the clear liquid, and add 10 g/L caustic soda to stir to make a strong alkaline disinfectant, and then use the liquid to spray disinfection around the culture pond. Finally, the overwintering cover on the surface of the Dianchi Lake was removed and the disinfectant was immediately sprayed on the mud surface and the inner wall of the pool. After completing the above work, check the wintering conditions of Huangpi and whether the facilities in Dianchi Lake are in good condition. At the same time, the mud inside the pond must also be trimmed and planted with aquatic plants such as mushrooms, oysters, and taro.

2. Maintain the water temperature. The temperature in spring is low, and sometimes the phenomenon of “cold winter” appears. Therefore, we must do a good job of insulation work. Initially, we can temporarily cover the overwintering plastic film, cover the sun for a few hours at noon and noon, cover the film in the afternoon, and conditionally use electric lights or other heating facilities. Warming the lamp can also enhance light and promote the growth of algae so as to inhibit the breeding of harmful bacteria. If there are grape vines on the top of the pond around the Dianchi Lake, the trees should be strengthened to use as much sunlight as possible.

3. Water quality management. Astragalus is an animal that prefers shallow water and thermophilia. Therefore, in early spring, the water level should be controlled at about 6 cm in order to increase the water temperature. At the same time, we must do a good job of changing the water to keep the water fresh, increase the appetite of the jaundice, and increase the conversion of the bait. Changing water is an effective way to remove dirt from ponds, increase dissolved oxygen, and keep water fresh. However, Astragalus is more sensitive to water temperature differences. Once the temperature difference of the water exchange exceeds 3°C, Astragalus may suffer from a cold and gradually die. Therefore, when changing water, it should be replaced with warm water as much as possible. The general measure is to build a new reservoir, and then change the water after exposure. The number of water changes should be based on the stocking density of Astragalus, feeding conditions, temperature and other flexible control, the time is generally sunny at noon as well. Do not change the water when the temperature is low. When the temperature rises to 15°C, the water can be changed once a week. Each change of water accounts for 1/4 of the total water volume. When the temperature rises to around 20°C, the water can be changed every 5 days, and the water can be changed every time. /30.

4 timely feeding. The early spring feeding is mainly to restore the physique of the jaundice, promote the activity of the jaundice, increase the appetite of the jaundice, and adjust the eating habits of the jaundice. According to the experiment, the order of the olfactory sensitivity of the scutellaria baicalensis to all kinds of bait is from high to low: 蚯蚓, 蚬, snail, pupa, frog, chicken, duck, pig intestine, etc., and fresh live bait is better. Usually live quail feeding, small-scale can be fed mealworm, usually live bait for about 1 week, jaundice can be out of the nest, then you can gradually feed to feed other types of bait. The amount of bait may be about 0.5% of the weight of jaundice for the first time. If there is more than enough bait on the second day, it should be reduced as appropriate. Otherwise, the amount of ration should be increased.

5. Disease prevention and control. In the case of low temperature and low light in spring, Scutellariae is susceptible to watery mildew. In addition to strengthening the light and raising the water temperature, 0.5 g/L salt and 0.4/L baking soda solution can be used as the control solution. Spilled. After onset, 0.2 mg/L malachite green or 0.3 mg/L methylene blue solution can be splashed in the whole pool, once every 3 days, and 3 times can be cured.

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