The polyculture of crabs and fishes refers to the rational stocking of high-quality fish species in the crab pond. Without changing the feeding, the principle of symbiosis and mutual benefit of crabs and fishes is utilized to fully utilize the bait fertilizer resources, improve water quality, and increase the utilization rate of pond water surface. 1, pond site selection. (1) The ponds should be constructed away from the factories and where there is no industrial waste water pollution, so that water can be provided (convenient drainage and irrigation), road access (convenient transportation), and electricity (electricity guaranteed). (2) General requirements Pond area of ​​5-10 acres, rectangular (long east and west), length-to-width ratio of 3:1-4:1, pool depth 1.5-2.5 meters, pool pots higher than the maximum water level of 50 cm per year. 2, pond clearing. (1) Pond renovation: The pond should be dry ponds each year to remove excess silt (10 cm thick), exposed to sunlight for 15-20 days, and reinforce the ponds and dredge the waterways. (2) Pond disinfection: It should be carried out on a sunny day. The bottom of the pond should be filled with 10-20 cm of water, and lime (lumps) of 75-100 kg per mu should be used. 3, seedling stocking. (1) Restocking mode (calculated on 1 mu of water surface): 1000 species of crab species with 10 g stocking specifications; 12 species of chain fish fry with 300 g specifications; 12 species of chain fry with 60 g specifications; 300 species of salmon seedlings with 300 g specifications Tail; specifications for the 60 grams of carp seedlings 3 tail; specifications for the 50 grams of carp seedlings 150; size 15 grams of carp seedlings 166. (2) Selection of seedlings. In addition to cultivating small-scale fish species for the next year, other crab species and fish species have to be selected from large-sized, well-ordered, robust and healthy disease-free seedlings. (3) The crab species should be soaked with 3%-4% saline solution for 5-10 minutes before stocking, or 10-20 minutes with 810-6 concentration copper sulfate solution. The length of immersion is related to water temperature, water quality, and stocking species. To be flexible, it is best to try it in small quantities first. The release of crab species should be carried out on sunny days to prevent frostbite. After spring, each mu will be re-introduced with different specifications of oysters, oysters, and breams. The large-sized cultivating products will be listed on the market, and the small-sized breeding fish will be retained for the following year. It should be noted that carp, herring, blackfish, etc. must not be used in the crab fish polyculture pool in order to avoid invading crabs. 4, pond management. (1) Water quality management: Regular use of quicklime to improve water quality. The water temperature in March-April is low, once a month; the water temperature is higher in May-September and twice a month. Dosage: 10-15 kilograms per acre, after the water Quanchiposa. When the water quality of the pond is found to be too strong, new water should be added in time, and the amount of water injected is 1/5-1/4 of the pool water. (2) Oxygenation management: The aerator will not be opened in the evening on a sunny day. It will not open during the rainy days. When the cool wind is high, it will be less open. It will not open as much as possible because the river crab needs a quiet living environment. In the event of an unusual situation, the weather is generally open at noon, open on a cloudy morning and open at midnight on a rainy day. 5, take advantage of the listing for competition. The round-fishing listing in the polyculture of crabs and fishes means that for large-sized squid, in general, large-sized squid will be available from July. 6. Analysis of the economic benefits of polyculture of crab fish (calculated on 1 mu of water surface). Feed fee: 1445 yuan, seedling fee: 656 yuan, medicine fee: 200 yuan, utility bill: 200 yuan, depreciation expense: 200 yuan, pond rent: 180 yuan, total: 2881 yuan. Production value: 4552 yuan, benefit: 4552-2881 = 1671 yuan.
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