The deep-water soilless cage high-yield and high-efficiency aquaculture technology project undertaken by the Hubei Yuan'an County Agricultural Technology Center has passed the acceptance inspection. The center implemented a deep-water soilless cage culture of 200 square meters of astragalus, the average yield of 13.64 kilograms per square meter, the unit production value of 625.5 yuan / square meter, a profit of 280 yuan / square meter. The main technologies are now described as follows:
1 cage production. The cages are rectangular and have an area of ​​15 to 100 square meters and a length of more than 3 times the width. The total height of the cage is about 1.5 meters, ie no water depth is 0.5 meters to 0.7 meters, and the water outlet height is 0.8 meters to 1 meter. The cage material is made of polyethylene mesh and the mesh size is 0.8 mm to 1.2 mm. The rope diameter of the upper and lower cages is 6 mm.
2. The cage settings. Net cages should be installed in sunny, clean water, and relatively quiet waters, such as ponds, rafts, and rivers, lakes, and reservoirs with stable water levels. When nesting the cages, the bamboo rafts that support the cages must be tightened and the steel ropes around the cages must be tightened. Put 25 kg of yellow mud into each of the four bags and press them against the bottom corner of the cage without water, so that the mesh above and below the cage is perpendicular to the water surface or the bottom of the water.
3. Transplant water plants. Astragalus inhabits and operates on aquatic plants. To choose plants that grow fast and form floating rows, such as water peanuts and water hyacinths. To transplant and cultivate floating aquatic plants, it is advisable to take 1/3 of the cage at both ends of the cage, and cultivate a floating row with a thickness of 20 cm to 30 cm, leaving 1/3 of the blank surface in the middle. The method is: First, straighten the grass vines one by one on the shore, and pile them up into piles. Then use your feet to practice on the piles. Then use 5 iron forks to pile up the plants and vines erected one by one in the cage. Generally about 25 kg can be erected per square meter.
4. Kind of stocking. After soaking for 10 days to 15 days, after the water plants in the cage are alive, they can be selected for the daytime when the water temperature is 18°C~20°C. The quail species are to be caught in the wild, yellow in appearance, disease-free, injury-free, and strong in activity. The specifications are 30 grams to 40 grams per tail. Disinfect with 2%~3% saline before bathing for 5 minutes to 8 minutes. The planting density is determined according to the area of ​​aquatic plant floating, and generally 2 kg to 2.5 kg of seed can be released per square meter.
5. Domestication and feeding. After two to three days into the box, they can feed animal feed such as clams, fresh fish, shrimp, and quail meat. After feeding, they begin to feed. Before feeding, feed for 1 day, and then use fish paste, stew or clam with compound feed according to the ratio of 9:1, then gradually increase the proportion of compound feed within 4 days to 5 days, and finally determine the dosage of compound feed at 60 %~70%, the amount of animal feed is 30%~40%. For every 100 kilograms of scutellaria, the daily feeding amount is 5 to 6 kilograms. It is best to feed in the evening, generally on aquatic plants.
6. Daily management. The use of "push-out method" to collect the residual food and remove dead cockroaches is to push the floating plant of one end to the other. When you need to operate the other end, push the merged row slowly to the other end. When it is necessary to check the midpoint, the merged row can be returned to the original position. This method facilitates rotation checks and day-to-day management throughout the entire cage.
7. Prevention and treatment. As long as strict quality control, regular disinfection and deworming work, generally very few. Disinfection: Once in 20 days, sprinkling with 25mg/L quicklime or 1mg/L bleach. Deworming: 40 days once, with the 0.45mg/L crystal "trichlorfon" full box spilled. In the event of enteritis, every 100 kg of Astragalus use 5 grams of oxytetracycline or sulfamethoxazole, and even feed 5 days to 7 days Jiyu. If bleeding occurs, every 100 kg of Astragalus is treated with 2.5 g of fluoctic acid and baits and fed for 5 days to 6 days.
8. Safe wintering. This method of breeding astragalus can not safely winter, need to be all fishing before the end of December to sell. If you need to stay in the plant or wait until the off-season before and after the Spring Festival, you must transfer the scutellaria to the special wintering pool in the late autumn and winter. For each 50 kg of yellow peony, a square earthen pond with a length of 3 meters and a depth of 1 meter is required to be excavated. The original cage is to be placed in the pond and 20 cm to 30 cm into the soil. Soaking in water for 2 days to 3 days can be used for wintering. Keep 20 centimeters deep for 10 days to 15 days after discharge, and then drain the pool slowly. At the beginning of the frost, put cold grasses such as straw and thatch in the pool to ensure that the yellow locust will safely pass winter. (Author: Yang Yufeng; Tansi Xiong; Zhang Kaimei)
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