Traditional crab farming techniques require that crab crabs be seeded once at a time and the specifications are neat. However, during the actual production process in the past few years, it has been found that adopting split seedling method in natural large water surface can achieve better economic benefits. The test results are summarized as follows: First, the water conditions It covers an area of ​​158 mu and is a natural river channel in the Shu area. It communicates with the external river channel. The water flow is relatively stable with an average water depth of 2.1 meters, a depth of 3.5 meters, and a shallow water area of ​​2/3 area. The bottom is black loam. 1. Planting of aquatic plants From August 2004 to May 2005, 21 tons of algae were transplanted. In early April 2005, 203 kilograms of bitter grass seeds were planted. Deep-water species of goldfish algae, shallow water species of Vallisneria, water grass coverage of 70% -80%. 2. There are abundant snails in the ponds for transplanting snails. From November 2004 to April 2005, 36 tons of snails have been placed, including snails of the original pond and 500 kg of snails. 3. Clearance treatment of clear ponds is due to the fact that they are large bodies of water and they are connected to each other. Due to geographical and water transport restrictions, they cannot adopt feral fish. In November 2004, 14 tons of lime water was splashed in Quanchipia. In February 2005, 6 tons of quick-lime water was sprayed on Quanchiposa to purify the water, making the water transparent to 1.5 meters PH7.5-8.5. Two seed stocking 1. Sources and specifications of seedlings At the end of May 2004, the Yangtze River Department of Chinese Mitten Crab (Eriocheir sinensis) was purchased from the Sheyang Nursery in Jiangsu Province and cultivated in the region. The crabs and crabs cultivated were adapted to the local environment and avoided long-distance transportation. Improve the survival rate of crab ponds. 2, stocking (1) In August 2004, 50,000 crabs and crabs were introduced, and the specifications were 400-500 eggs/kg; in July 2005, 31,000 fingerling crabs were placed, and the specifications were 120-160 eggs/kg, and a total of 81,000 eggs were put in. 512,. (2) Set 100 kg of young shrimps, and put them in December 2004; 2500 fishes of carp and carp, and put them in December 2004; put 1500 carp seedlings in May 2005.
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(3) Seedlings were sterilized with 3% to 5% saline for 10-15 minutes before killing surface bacteria and parasites.
Third, feeding and management
1. The early start of food in mid-February began feeding the bait, mainly feeding chilled fish, with a small amount of formulated feed. From May to September, the supply of bait is sufficient to ensure that the crabs eat well, and the feed amount is about 8%, depending on the feeding activities of river crabs. Vallisneria is a barometer for feeding crabs. When there is enough food, there are few leaves that are caught by the crabs. If there is a lack of feed, there will be a large number of bitter grass leaves that are bitten by the crabs. At this time, the amount of feeding should be increased appropriately. 20 to 30 days before the listing of crabs, increase the amount of feeding, feed high-protein animal feed (chilled fish), enhance crabs constitution, make crab yellow, paste more full, increase economic efficiency. Feeding amount of 52,000 kilograms was applied throughout the year.
2. Anti-escape water surface crabs management work focus is to prevent escape, escape prevention is the key is to set double barriers in the inlet and outlet, and set the cage in the two-tier block, check the cage and block the net every day, especially in the rainy season, heavy rainfall, The water level is apt to rise, adhere to the day and night duty, found that the river crab escaped, and check the reinforced barricade facilities in time.
Fourth, timely fishing
Fishing begins in late September and peaks in early October. The fishing method is cage crabs.
V. Economic benefits
A total of 8,714 kilograms of merchandise crabs were caught, with an average size of 215 grams and a catch rate of 50.03%; 503 kg of carp, 8493 kg of carp, 1,351 kg of green shrimp, and 2,487 kg of other fish. The total output value is 955,000 yuan, of which the output value of crabs is 802,000 yuan; the total expenditure is 3.8135 million yuan, the profit is 573.65 million yuan, and the mu profit is 3631 yuan.
Sixth, experience and experience
Since the surface of the water is a natural river ditch in the reclamation area, it circulates with the outside world, there are five import and export, the maximum width of the exit is about 65 meters, the water level is unstable, and it is necessary to use stumps to fix the blocking facilities to ensure that the water body is relatively stable, and the rainy season and the flood season should be relatively stable. Strengthen patrolling. In addition, when the crabs mature, they can catch fish in a timely manner to prevent escape and increase the rate of withdrawal.