(D) Feed Management Seed Breeding The key to the success of the breeding of four Astragalus membranaceus, the main day-to-day management is to keep the fresh water in the Dianchi Lake. The quality of the water is required to be fat, live, tender, cool, and oxygenated. Dissolved oxygen in water must not be less than 2 mg/l. The pool water should be shallow when stocking is just started, because the water chestnuts need to stretch out to breathe from time to time, the water level is too deep, the head can not stick out of the water, cause breathing difficulties, and it will suffocate as time goes by. Normal depth of 10 to 15 cm is appropriate to observe the survival of the pups. Afterwards, the water depth can be gradually deepened to 20 cm. Change the water frequently in the pool, change the water every 7 days in spring and autumn, and change it every 3 days in summer. In order to prevent water pollution after feeding, some new water must be replaced. The feeding and management during the high temperature season is very important in the cultivation process. The specific methods are as follows. 1. Control water temperature: There are the following two methods. (1) Plant aquatic plants: water hyacinths, water hyacinths, etc. The area planted does not exceed 1/3 of the total area, so the water temperature can be lowered in summer to keep the pool water temperature between 25 and 30°C. Purify water quality. (2) Shed shading: Generally, it is possible to plant climbing plants such as loofah, cucumber, lentils, etc. The shading area accounts for only 2/3 of the total area. The principle is that only the east head day should be used, and Xitou day should not be given. (3) Change the water frequently: properly deepen the water level, increase the number of water changes, it is best to change the water once a day, so that the water level is maintained between 20 ~ 25 cm. The water color is light brown or tender green, and the transparency is about 25 cm. 2. Strict management: Before the rainstorm, to prevent the water level from rising, some water should be drained to prevent the yellow peony from running off the wall; in the midst of summer feeding, it is generally advisable to use it in the early evening, or it can be slightly receded. At this time, the water temperature is low and it is convenient for the cricket to eat. activity. Fresh live feeds can be fed only after they have been washed and disinfected, rotted and degraded, and fed; often check whether the anti-escape facilities at the injection and discharge facilities are damaged, and prevent rainwater from flowing into the pool. Autumn is the most suitable season for growth in the breeding process. The main task at this time is to strengthen the fattening, promote its rapid growth, and prepare for the future hibernation. Therefore, daily management should be fed with high-quality and sufficient amount of bait to enhance the body composition of Astragalus membranaceus. At the same time, because the growth rate of Astragalus membranaceus at this stage is fast, the size and specification of the Astragalus membranaceus grow more easily, and the differentiation becomes more and more intense. At the same time, the relative density increases due to weight gain. , Different specifications of Astragalus are not the same in feeding and management, so the timely separation of the pool is particularly important. In order to increase efficiency and reduce injuries when pooling, we have chosen another method. In actual production, it is best to ensure that it is screened once every 30 days in order to obtain good breeding results. When the water temperature dropped below 10°C, Huangqi began to hibernate into the mud, and antifreeze work should be done at this time. Before the winter is over, the water will be drained. To keep the soil moist, cover the mud with 20-30 cm of straw to prevent freezing. Huang Xi was hibernating, and people and animals were forbidden to walk around and collect debris in Dianchi Lake so as not to affect the respiration of Huang Qi. If there is too much rain and snow in winter, the pool of stagnant water should be drained in time. After winter, when the temperature of the spring water rises above 14°C, the pool grass is gradually removed and water is added, but it should not exceed 5 cm. If water is added too early and it is too deep, the jaundice will be tempted out of the hole, causing death due to frequent temperature changes. (E) Disease Prevention and Treatment Huangqi is highly resistant to diseases in natural environments. Generally, there is no mucus protection on the surface of injured jaundice and it is difficult to cause diseases. Artificial breeding, high density, easy to disease. Once onset, it is generally difficult for the drugs to work. Control of jaundice disease mainly has the following aspects. (1) Introduce strict checks. It was found that the corpse was weak and the anal reddish, and the jaundice, which was suffering from enteritis, was firmly rejected. (2) Control the presence of pathogenic microorganisms in the eel environment. The rearing pond must be thoroughly disinfected with quicklime (120-150 mg/l) or Wan Xiaoling (100 mg/l), and the carcass should be soaked with 4% salt solution for about 10 minutes before stocking. Chlorine dioxide 2.5 mg / liter, such as spilled disinfection, and the oxytetracycline drug added to the squid with squid bait mixed baits made for the prevention of disease. (3) Control stocking density. It is more appropriate to control the number of yellow locusts per square meter of water to be controlled from 100 to 200. (4) Improve the water quality of raising fish. The use of artificial micro-water culture methods, so that the water to maintain a high dissolved oxygen. (5) Shade cooling and heatstroke protection. In summer, the water temperature is too high, and the yellow peony is easy to die of heatstroke. Therefore, it is necessary to plant Sagittaria, water hyacinth, water peanuts, alfalfa and other plants in the rearing pond. It is best to put a grape stand, a loofah stand or a shade net to cover the pool.
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