In recent years, aquatic products have shifted from the "seller's market" to the "buyer's market", prices have fallen, and the aquaculture benefits have declined. According to the principles of aquatic biology and ecology, the use of natural ecological environmental conditions to simulate fish, shrimp, crabs, clams, cockroaches and other varieties of polyculture, can achieve the purpose of low input and high efficiency of pond culture.
I. Pond conditions
The pond is nearly square, surrounded by 8 meters wide and 0.6-0.8 meters deep. The beach surface can lift water to 1.2 meters. The bottom of the pond is sandy soil with less silt. The water quality is good, and the water injection and drainage facilities are complete. One tonne of cement boat 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, seed stocking
River Crabs: Before the month of May, about 86,000 “bean crabs†were reared on about 1000 per kilogram of early-growth eye larvae, equivalent to 1870 per mu.
Green prawns: After the clear pond, young prawns can be reared for 3-5 kilograms per mu, or about 50 pounds of broodstock per kg before and after April, 25 kilograms per mu, with an average of 0.5 kilograms per mu.
Fish species: After rearing in the clear pond, about 20 kg per kg of heterotrophic silver carp species, equivalent to 4.3 kg per mu. In the middle and late periods, due to the overgrown aquatic plants, grass grasses were controlled to release water and grass, releasing a total of 400 kilograms, an average of 8.6 kilograms 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, fertilization and feeding
Adopt natural ecological breeding methods to cultivate and breed natural foods (plankton, benthos, snails, aquatic plants, etc.) with cheap fertilizers (chicken manure) and snails for free feeding by farmed animals. Artificial feeding is only a supplement. During the whole period, a total of 2,000 kilograms of feedstuffs such as 1,500 kilograms of soybean cake, 1,000 kilograms of bran, 1,000 kilograms 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.
Fourth, daily management
Water quality regulation: patrol the pond once a day in the morning and evening, according to water quality, weather, floating head situation at any time to add water to increase oxygen. 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 injection is generally 20-30 centimeters. The dissolved oxygen is sufficient, the water level is relatively stable, the transparency is about 35 centimeters, and the water quality is “fat, live, tender, and cool. "The request. Every 1 month Quanchipa was splashed with lime to adjust the PH value of the pool water.
V. Disease Prevention
During the whole breeding process, fish species were soaked with 3% saline for 10 minutes before stocking, and shrimp and crabs were stocked with 50 mg/up of potassium manganate for 2-3 minutes. During the growing season, the bait is fed once every two weeks (50 kg of feed plus 25 grams of oxytetracycline, twice daily, and fed for 3 days). In addition, baits, tools, etc. are often disinfected with bleach.
Six, product fishing
Astragalus, loach, crayfish, crayfish crustaceans are used for a long period of time to use cages for the purpose of catching large and small animals. As long as they meet the market specifications, they must be sold. After the “Chongyang†Festival, crabs were captured by hand in the poolside pond in the evening and combined with cages. Until the end of November, dry ponds were used for fishing in the next cycle.
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