Polyculture refers to the farming method of raising multiple aquaculture species in the same water body in order to make full use of the productive potential of the water body and increase production. Here's a brief introduction of fish, crab, crab, and polyculture technologies: First, the election pond. The pond is nearly square (about 46 acres), surrounded by 8 meters wide, 0.6-0.8 meters deep, and the beach surface can be lifted to 1.2 meters; the bottom of the pool is sandy soil with less silt; the water quality is good, and the water injection and drainage facilities are complete. A small wooden boat can be set in the pond for feeding, fertilizing and managing. The inside of the pond is buried in the soil with a dense mesh of polyethylene mesh to prevent burrowing, maggots, crayfish, crabs and other holes. The pool is firm and leak-proof. Use asbestos tiles for escape prevention. At the beginning of a breeding cycle, the ponds should be dredged and repaired, strictly disinfected with quicklime, tea seed cake and other drugs. After filtration and water injection, adequate base fertilizers are applied to cultivate natural foods, and aquatic plants such as Artemisia halodendron and Vallisneria are planted. Before and after a large number of live snails, let it reproduce naturally. Second, seedlings Fish species: After rearing clear ponds, about 20 kilograms of different types of silver oysters will be stocked for about 20 kilograms per kilogram, equivalent to 4.3 kilograms per acre. In the middle and later stages, due to the overgrown aquatic plants, grass grasses were controlled to release aquatic grasses and put a total of 400 kg, an average of 8.6 kg per mu. Green prawns: After the clear pond, young prawns can be reared at a rate of 3-5 kilograms per mu, or about 80 pounds of broodstock per kg of about 80 eggs before and after April, with an average of 0.5 kg per mu. Crabs: 8 to 90,000 “bean crabs†were reared before 1,000 months per kilogram of 1,000 larvae reared by macro-raised larvae, equivalent to about 1800 per mu. Other species: The ponds that cultivate shrimps and crabs all year round have little use of pesticides to protect the natural resources such as yellow earthworms, loach and crayfish in the ponds. Generally, no additional seedlings are needed to allow them to reproduce naturally in ponds. And grow. Third, feeding tube. Adopt natural ecological breeding methods to equip fish species with free fertilizer (chicken manure) and breeding natural foods (plankton, benthos, snails, aquatic plants, etc.) for artificial feeding. 2,000 kg of feed such as 1500 kg of bean cake, 1000 kg of bran, 1,000 kg of rice bran and small weeds were fed. Feeding and fertilizing can be controlled flexibly according to the weather, water quality, the amount of natural food, the amount of cultured ponds, and the growing season. Take a tour of the pond once a day, morning and evening, and add oxygen at any time depending on water quality, weather, and floating head conditions. In normal conditions, water is added 1 time per week. Each time the amount of water is added to the water in the pond, the water is usually injected into the pond 20-30 cm. The dissolved oxygen is sufficient, the water level is relatively stable, the transparency is about 35 cm, and the water quality is “Fat, live, tender, and cool. "The request. Every hour, Quanchipa splashes lime to adjust the pH of the pool water. Fourth, prevent disease. Throughout the culture process, fish species were soaked with 3% saline for 10 minutes before stocking, and shrimp crabs were stocked with 50 mg/up potassium manganate for 2-3 minutes. During the growing season, the bait is fed once every 2 weeks (50 kg of feed and 25 g of oxytetracycline, twice daily, and fed for 3 days). In addition, baits, tools, etc. are often disinfected with bleach. Fifth, fishing. Yellow oysters, loach, shrimp, crayfish crustaceans are caught in cages all year round, and the method of catching large and small animals is adopted. As long as they reach the market specifications, they must be sold. After the “Chong Yang†Festival, crabs were captured by hand in the pool ponds in the evening and were caught in cages until the end of November. The ponds were used for the next cycle.
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