1. Pond preparation area is 5 mu ~ 30 mu, water depth is about 1.5 meters, water source is not polluted, drainage is convenient, electricity is available, water and land transportation are convenient. At the end of one culture cycle, the pool water was drained and the surface silt was removed to dry and hard cracked. 2 weeks before seeding, disinfect with drugs and filter water 1 week before seeding.
2. The supporting facilities are equipped with 3 kilowatts of oxygen aerator per 5 mu of water surface, and a pump pump is installed at the inlet. For the secondary desalination of Macrobrachium rosenbergii, a strip of cloth was used to stop the corner of shrimp pond as a holding pool.
3. Time linkage
From the beginning of November to the end of April of the following year, it will be the feeding period of shrimp; in early May, it will be sterilized in Qingtang, and the shrimps of Penaeus vannamei or Macrobrachium rosenbergii will be released from mid-May to early June; and Macrobrachium rosenbergii will be cultured from mid-June to mid-October. Period; fishing begins in mid-October until the end of the month.
4. Ready-to-eat shrimps for young shrimps can be purchased from other ponds. For the purpose of targeting, a small pond occupying about 3% of the area of ​​Datang can be excavated in one corner or one end of Datang. Husband and broodstock are self-producing and self-developed young shrimp.
Second, breeding operation technical points
1. Seedlings stocked with Macrobrachium rosenbergii purchase virus-free healthy desalinated shrimp seedlings, with a specification of 1.2 cm or more and a mu of 25,000 to 35,000 tails. Green shrimp seedlings size 1 cm to 1.5 cm or larvae of more than 300 pounds per kilogram, 20,000 to 30,000 prawns per acre or 3 kilograms to 5 kilograms of larvae, and about 100 grams of polyculture tail weight per mué²¢ and bream species 50 to 100.
2. The protein content of feed for feeds of Macrobrachium rosenbergii is in the range of 20% to 35% (35% to 30% for larval shrimp, 20% to 25% for middle prawn and commercial shrimp), and the daily feed amount is shrimp body weight. 3% to 7% of the diet was fed 2 to 3 times a day, mainly in the evening. The grain size of bait is controlled at 2 mm or less in the early stage, 3 mm to 4 mm in the middle and later stages, and animal fresh materials such as small mixed fish, snails, clams and quail meats are fed at a later stage. When the temperature of water in winter and spring is low, fresh shrimp can be fed once a day at sunny place, and the growth period can be fed at 3% to 5% of the body weight of shrimp. The natural biological feed in the proliferation tank is mainly based on fertilization, making the water yellow green or brownish brown.
3. Water quality regulation
The pH is maintained between 7.6 and 8.3, the dissolved oxygen is above 5 mg/l, and the transparency is kept between 25 cm and 35 cm. Appropriate fertilization is based on the fat and water conditions of the pool, and the method of applying less fertilizer and more fertilizer is used, and new water is regularly added, and water is changed as necessary. During the growing season, the aerators were opened twice a day and each time they were turned on for about 2 hours.
4. Daily management adhere to the morning and evening patrol ponds, observe the shrimp pond water environment changes, shrimp activities and feeding, whether there is shrimp disease, shrimp pond leakage and whether there is any enemy harm, etc., find problems and take corresponding measures in time. In order to prevent diseases of Macrobrachium rosenbergii, the following measures can be taken: (1) When the shrimps are stocked, they are bathed with formalin for 2 minutes to 3 minutes. (2) Disinfect the entire body of bromochlorohetide every 15 days to 20 days during growth. (3) Photosynthetic bacteria are used once every 20 days during the cultivation period. (4) Regularly add a certain amount of allicin, multivitamins, and "King shrimp King" to the feed.
5. Adult Shrimp Harvest Macrobrachium praecox uses nets for fishing. When harvesting in small quantities, shrimps can be caught by nets such as cages and dip nets. At the same time, they must be caught, shipped, and sold. When the price of shrimp rises after the Spring Festival, cages, dip nets, trawls, and other tools are used to catch shrimps and they are listed on the market several times during the breeding period.
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