(A) The main support: The main area of ​​the United States to eat large mouth roach fish is 8-15 acres is appropriate, if there is no big pond, use 1-3 acres of small pond can also be, the pond has a water inlet and outlet, convenient water source, fish pond in stocking Before the fingerlings were thoroughly disinfected with quicklime to kill germs, wild fish and parasites. The main mode of feeding includes main feeding and main fertilization.
1. Feeding for main breeding: Fish stocking is generally conducted in October. About 60 grams of American large-mouthed rouge fish per acre are used. About 50 pheasants of white pheasant, about 100 grams in size, 25 bream, and about 60 grass carp size 25 At the end of the day, fish stocks were selected for sunny days. All stocked fingerlings were sterilized with salt and malachite green.
2. The nutrient source for feeding pond fish is provided by artificial feed. Winter feeding generally accounts for 0.5-1.0% of fish's body weight, 5-7% of fish's body weight in summer, and 2-3% of fish's body weight in spring and autumn. In the main pond, the water quality is adjusted once every month, and one-third of the original pond water is replaced, and new water is poured into the pond. After 12 months of breeding, the total net production per mu is about 610 kilograms, including 400 kilograms of bigmouth bass. The survival rate of bigmouth bass is about 94%, and the feed cost per kilogram of fish is 2.57 yuan.
3. Fertilizers are mainly raised in the feeding ponds and the feeding conditions are basically the same as feeding ponds. Unlike the ponds, the main ponds are mainly water-maintaining, with only one or two injections of water per month. The main source of fertilization is the conversion of plankton, supplemented by feeding. After 12 months of breeding, the total net production of the mu can reach 720 kilograms, of which about 460 kilograms can be produced per mu. The survival rate of this kind of American bigmouth carp is about 90%.
(2) Polyculture: In the conventional main breeding pond of the national fish, 30-66 tails of American bigmouth roach fish are bred per acre, and no special management is required. Between 35 and 80 kilograms of American bigmouth bass can be harvested for 1.3-1.4 kilograms per acre.
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