Key points of mixed culture of fish, shrimp, eel, dolphin and crab

First, the selection pond is nearly square, with a width of 8 meters and a depth of 0.6 meters to 0.8 meters. The beach surface can lift water to 1.2 meters, the bottom of the pond is sandy soil, the water quality of the source is good, and the injection and drainage facilities are complete. The inside of the pond is buried in the soil with close-eye polyethylene mesh to prevent eel, Loach, crayfish and crabs from drilling holes. Use asbestos tiles as anti-escape walls. The pond should be strictly disinfected with quicklime and other drugs, apply sufficient basic fertilizer, cultivate natural bait, and plant Artemisia grass, bitter grass and other aquatic plants, and put a large number of live snails before and after the "Qingming Festival" to let them reproduce naturally.

2. After clearing the pond, about 20 allogenic silver crucian carp fingerlings per kilogram are released, equivalent to 4.3 kilograms per mu. In the middle and later period, because the growth of aquatic plants is too luxuriant, grass carp are released to control aquatic plants.

Green shrimp: after clearing the pond, you can release young shrimp, 3 kg ~ 5 kg per mu, or about 80 eggs per kilogram before and after April, with an average of 0.5 kg per mu.

River crab: before May, there are about 1000 early propagated "bean crabs" per kilogram, equivalent to about 1800 per mu.

Third, the feeding tube adopts the way of simulating natural ecological culture, and uses cheap fertilizer (chicken manure) and snail to cultivate and reproduce natural bait for free foraging of breeding varieties, and artificial feeding is only as a supplement. A total of 1500 kg of soybean cake, 1000 kg of wheat bran, 1000 kg of rice bran and 2000 kg of small weeds were fed during the whole period. Feeding and fertilization can be flexibly controlled according to the weather, water quality, the quantity of natural bait, the stock of breeding varieties and the growing season. Patrol the pond once every morning and evening, and add water to increase oxygen at any time according to water quality, weather and floating head. Normally, add water once a week, generally inject water 20 cm ~ 30 cm, keep sufficient dissolved oxygen, the water level is relatively stable, the transparency is about 35 cm, and the water quality meets the requirements of "fat, live, tender and cool".

Fourth, disease prevention in the whole culture process, fish fry are soaked in 3% salt water for 10 minutes before stocking, and shrimp and crab breeds are bathed with 50 mg / L potassium permanganate for two or three minutes. Bleach is often used to disinfect bait tables, tools, etc.

Fifth, fishing @ # @ 236 birds @, @ # @ 237 birds @, green shrimp, crayfish, crayfish are used to spread cages all the year round, and the method of catching large and small crayfish is adopted. as long as they meet the market specifications, they must catch @ # 136 crayfish.