Huang Xi summer breeding management technology

As the saying goes: "After three days, Huang Yusheng gold brick." This sentence fully illustrates that the midsummer high temperature season is the key moment in the breeding of yellow oysters. The technical points in the management of aquaculture during the midsummer cultivation of Astragalus are briefly described below.
1 Control water temperature The water temperature directly affects the growth and feeding of Astragalus membranaceus. Astragalus is a kind of fish that is more afraid of heat in freshwater fish. The most suitable temperature is 22-28°C. When the water temperature was higher than 28°C, the food intake decreased significantly and growth was inhibited. In the hot season, due to the shallow water level in the Dianchi Lake, the water temperature can easily rise to 28°C. Therefore, the summer heatstroke must be done to prevent the heat from cooling. The main methods are:
1.1 Planting Aquatic Plants Aquatic plants are used as a way to block part of the sun and make them easier to lurk. They can improve the environment of the pool, reduce the water temperature of the pool, and are beneficial to the survival of the astragalus. However, the planted area must not exceed 1/3 of the total area. The varieties planted include white peony, water hyacinth, and duckweed.
1.2 Shelter Shading It is not enough to rely solely on aquatic planting to shade the water. In order to do a better job of cooling off the sun, it is necessary to put a shady shade. Generally can be taken to plant some loofah, cucumber, lentils and other climbing plants. The shading area accounts for only two-thirds of the total area. The principle is based on the eastern head only, not on the Xitou day.
1.3 Changing the water temperature in midsummer When the temperature is high, the water in the pool evaporates quickly, the water level is extremely light, the water temperature rises quickly, and because of the high density of the scutellaria baicalensis, the mucous secretion of the carcass surface is more. If the pool water is not updated, the mucus will accumulate. , Fermentation, so that the water temperature rises rapidly. Therefore, we must always pay attention to the water temperature, timely addition of new water, so that the water level is maintained at 20 ~ 25cm, it is best to change the water once a day, change the amount of water for 1/3 ~ 1/4.
2 Management of water quality Dianchi Lake water quality should be maintained: "Fat rather than rot, tender but not old, cool but not widowed, live without sparse."
Fertilizer: The water color is light brown or tender green, the transparency is about 25cm, dissolved oxygen is kept above 4mg/L. Due to shallower Dianchi Lake, do not use organic fertilizer in Dianchi Lake to avoid water quality deterioration;
Tender: It is required that the water in the pool is not old. The old water has two characteristics. One is the whitish color of the water, and the other is the water color is yellow or old brown, and new water should be added at this time;
Cool: The color is not strong and refreshing, the transparency is not less than 20 ~ 25cm;
Live: The color of water must change frequently.
3 Feeding management
3.1 The bait selection The squid is a omnivorous fish mainly based on carnivorous meat. It is better to use live bait such as cockroaches, fly maggots, cockroaches and river fleas. At the same time, some plant foods, such as bran and melon skin, were cast concurrently.
3.2 "Four" feeding
3.2.1 Timing feeding in midsummer is generally appropriate in the early evening and may be delayed slightly. At this time, the water turbidity is relatively low, which facilitates the feeding activities of the scutellaria baicalensis.
3.2.2 Quantitative feeding does not depend on the amount of residual bait, but the amount of feed is generally 6% to 8% of body weight.
3.2.3 The quality requirements do not disinfect or feed (live baits must be washed and disinfected after feeding), rotten degeneration does not feed;
3.2.4 Set 2 food stations for every 10 points. The food table will flatten the mud surface, slightly below the surface of the water, and put the bait on the table.
3.3 daily management
(1) Check whether the escape prevention net of the water inlet and outlet is damaged, repair it in time, and prevent rainwater from flowing into the pool.
(2) Prevent the invading pests of birds, beasts, snakes, and rats;
(3) to prevent pesticide poisoning, such as; sodium pentachlorophenol, carbofuran, killing pine, 1605, ammonia, etc. on the killing of Astragalus a great deal to prevent such pesticides into the pool.
3.4 Disease Prevention and Treatment
3.4.1 Fever fever Because of the large amount of Astragalus, the mucus accumulating on the surface of the corpus callosum accumulates and ferments, and the dissolved oxygen decreases. This makes the Astragalus irritant and uneasy, entangled and crowded with each other, and the body temperature rises sharply, causing the corpus callosum to have a fever and die. Control methods, evacuation of jaundice, reduce the density, immediately after the onset of new water replacement.
3.4.2 Coma Disease The disease is more frequent in hot seasons, and jaundice appears coma at the time of onset. Control methods: First shave temperature, then chop the fresh smashed meat, sprinkled into the pool, with a certain effect.
3.4.3 Spotted yellow spot on the back of yellow spotted spotted spotted bean. Prevention methods: stock some quails in the pool; when the disease occurs, peel the scalp, tie it with a rope, and repeatedly drag it several times in the pool. After 1 to 2 days, the disease can be eliminated.
3.4.4 The flu is caused by a large temperature difference between the waters. After the jaundice gets sick, the organs are dysfunctional, and the swimming is abnormal. In severe cases, it will die. Control methods: When changing the water, note that the water temperature difference cannot be too large. The new water should be injected into the buffer pit first, and then changed again after a period of time; each time the amount of water exchanged does not exceed 1/3 of the water volume, and is injected with trickle water.

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