In the pond, rational polyculture of green prawns, river crabs, bonito and other species can make full use of the natural baits in the water body, improve the production efficiency of the water space, and play a mutually beneficial role among the cultured species to promote the growth of aquatic products and reduce Production costs, improve the quality of aquatic products, and increase the efficiency of pond culture. First, the selection and clearing of aquaculture ponds. The water quality of the water source is fresh and pollution-free. It meets the requirements of the standard for water quality of non-environmental food freshwater aquaculture (NY5051--2001). The sandy bottom soil is preferred for sandy loam, and the mud at the bottom of the pond is no more than 15 cm. The pool is rectangular and the east-west direction It has an area of ​​3-4 acres, water depth can maintain 1.5--2 meters, pool slope ratio of 1:2.5, anti-escape wall set up the pool, into the drainage facilities are complete, easy to use, the pond does not leak, pond sturdy. The pond must be chilled in the dry pool in winter to remove excess silt and then treated with quick lime pond. 80-120 kg of lime per acre and 10 cm of water in the pond should be used to cool the lime slurry. Completely kill pathogens, parasites and predators. Second, transplant aquatic plants and put snails. After 7 days of clear pond, the pond is filled with water 20 centimeters. When the water temperature begins to rise in March, aquatic plants are transplanted into the pond. The species is mainly Elodea, and Vallisneria, Hymenocallis, etc. and other aquatic plants can also be planted to make aquatic plants occupy the area. About 60% of the water in the pond, especially the shoal area 1 meter away from the bank, is the area where shrimps and crabs are inhabited for easy observation. It is also necessary to plant good plants. With the growth of aquatic plants, the water level can be gradually deepened. When the crabs are released at the end of the month, the pool water can maintain about 0.8 meters. The snails are generally released in mid-April and they have selected fresh snails that have just been harvested from the surface of the river and put in 300 kg of water per acre to allow them to grow in the pond for the purification of pond water and for the feeding of crabs. Third, the shrimp, crab, crabs, seedlings are placed. 1, shrimp launch. Prawns can be stocked with overwintering shrimp or brooding broodstock. Egg-holding broodstock should be caught in large water surface. Over-winter larvae should also breed wild broodstock caught in large waters over the winter to prevent degradation of the shrimp germplasm, slow growth, and small size, affecting the aquaculture efficiency. The standard of high-quality shrimp is: neat specifications, complete appendages, shrimp crystal clear and translucent, agile activities, specifications for the 1500 / kg, general acres of 5-10 kg, if the holding of egg holding shrimp, the water level can be about 2 kg per mu . 2, crab species. The purebred Chinese mitten crab species in the Yangtze River system should be selected. Avoid use of germplasm mixed crab species. The crab species should be of uniform specifications, robust physique, quick crawling, and no disease or injury. The specifications should be 150-200 pieces per kilogram, and the stocking density should be 400-500 pieces per mu. The stocking time should be at the end of March. The aquatic grasses are not long enough to be raised in a corner of the pool. When the plants are flourishing during the 20-30 days, the nets are released to breed. 3, salmon feeding. Should choose to use scorpion fish, this squid grows rapidly under the appropriate conditions, the individual specifications are larger, suitable for nesting in shrimp and crab ponds. In early June, the catfish summer flowers with a size of 5 cm or more were housed in the pond, and 20 tassels per acre were appropriate. In order to facilitate the control of water quality, it is possible to mix and mix 50 white-tailed pheasants with a specification of 100 grams in the pond. Fourth, aquaculture management measures. The pond polyculture of squid, shrimp, and green crab is mainly due to the predation of miscellaneous fish in the pond. There is no special need for bait. However, when the bait fish are insufficient, some of them can be supplemented properly. Others, such as carp, require water quality. Basically consistent with shrimps and crabs, that is, fresh water, adequate dissolved oxygen, quiet environment, rich in aquatic plants, so no need to take special measures on the management of squid, shrimp and crab can be managed by the polyculture management program. 1, reasonable feeding. In the polyculture of shrimps and crabs, commodity baits such as snails, corn, wheat, small junk fish, and granular foods are all high-quality bait for shrimps and crabs, and snails are put into the pond. Through their natural reproduction, they can provide abundant live animal feed for crabs. On the other hand, the water quality is purified through snail feeding. Application of wheat, corn and other water soaked and cooked after feeding, small fish should pay attention to its freshness, can be chopped and fed, do not use metamorphic bait, so as not to cause shrimp disease and damage to pond water quality. Feeding feeds should adhere to the principle of “two fine and medium thick”, that is, animal feed and full price pellets should be used in the early and late aquaculture period, and wheat, corn, and other solid foods and aquatic plants should be used during the mid-season heat season. Green-green bait-based. All feeds must meet the requirements of the "Safety Limits for Non-Hazardous Foods and Feeds for Compound Feeds (NY5072--2002)" and must not use moldy and non-compliant baits. To adhere to the four feeding measures, put the bait into a lump in the near-shore aquatic grass, easy to observe the food residue, pay attention to scientific feeding, try to make shrimp and crab eat food, improve food utilization, reduce bait pair The pollution of waters keeps the water quality stable. 2, water quality regulation. In terms of water quality management, we must keep abreast of water quality, tenderness and coolness. During the cultivation period, the water-soluble oxygen in the pool should be above 5 mg/l, the pH should be maintained between 7 and 8.4, and the water transparency should be 30-35 cm. In the early stage of cultivation, water injection is the main method, until the beginning of June, the water level is stable at about 1.5 meters. In the high temperature season, the main water change is to change the water 2 - 3 times a month, each time 30 cm, first discharge the bottom of the pool waste water, add water to the provisions The water level will be changed once or twice a month in the late aquaculture period to keep the water fresh and stable. In the aquaculture production, quicklime can be used frequently to improve water quality, increase calcium in the water body, promote shelling of shrimps and crabs, and at the same time suppress and kill pathogens and increase the pH of the water body. Generally, it is applied every 15-20 days in high temperature season, each time the water level is 10--20 kg (according to the water depth). The fresh block ash should be used and the whole pool should be sprayed evenly after plasm. The use of microbial preparations such as photosynthetic bacteria is also an important water quality regulation technology in pollution-free production. Photosynthetic bacteria grow and multiply in the pool using organic matter as a nutrient source, rapidly eliminating harmful substances such as ammonia nitrogen, nitrite, and hydrogen sulfide in the water body. Keep the acid-base balance and dissolved oxygen level of the pool water so that the material in the water body is always in a benign circulation state. It is applied 1-2 times per month in the middle and late period of cultivation, and the dosage is 5-6 g/m3 each time. The application time should be at a sunny day with water temperature above 25°C. Before and after the application of photosynthetic bacteria, the use of fungicides and other drugs should not be used within half a month. After application, frequent changes of water should not be used to maintain the concentration of beneficial bacteria. 3, daily management. To inspect the ponds on a daily basis, check whether the anti-escape facilities are intact, observe the growth of shrimps, crabs, and quails, the feeding conditions, and the changes in pool water. Observe the residual bait and adjust the feeding amount in time. Clean up residual residues and baits, all kinds of debris and floating shells, aquatic plants, etc., do a good job of preventing predators, damage, theft, etc., and do a good job in aquaculture production records. Fifth, arrest and listing. 1, shrimp caught. Due to the rapid growth rate of shrimp, overwintering shrimp species can be harvested and caught by means of round catching after two months of breeding. After the broodstock are released, according to the breeding and growth conditions of shrimp, shrimps that meet the marketing specifications will be reached in due course. Get caught. In general every two weeks, shrimp is caught once, every time catching 2-3 days, using small square cages, shrimp cages or small cages and other fishing gear, put the bait inside the cage, the cage will be placed in the foraging habitat of the shrimp the night before. On the morning of the next morning, the cages will be harvested, shrimps will be released, and the larvae will be returned to the pool. 2, crab arrested. At the end of the fall, the crabs have their own swimming habits. Generally, it is the best time for crabs to be caught in October-November. It can be caught in fishing cages and other fishing gear. The crabs that are caught will be marketed in time, or they will be raised in cages. Sales. 3, salmon and other fish caught. At the end of the year, when dry ponds are used, fish, shrimp, and crabs are caught at the same time, and they will be listed on the market in a timely manner. Smaller sizes will be marketed, and ponds will be raised for winter. In the coming year, the fish will continue to be raised. Non-polluted polyculture shrimps and crabs, using carp to eat miscellaneous fish, can control the amount of wild fish in shrimp and crab ponds, improve the proportion of famous aquatic products, enrich people's lives, and also improve the comprehensive benefits of pond culture, it is a worthwhile Promotion of polyculture technology.

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