Since 2006, the multi-service center in Wuyi Town, Binhai County has vigorously promoted the technology of nesting crabs in ponds and crabs. It has achieved greater success and improved the economic benefits for farmers. The relevant technologies are summarized as follows:
Clear ponds were sterilized in winter to clear the ponds, first drained the pool water, exposed to water for 1 month, and then cleared excess silt (leaving sludge 5-10 cm thick for planting plants), and maintained the ponds so that the slope ratio reached 1:2.5- 3. After the renovation of the pond, 100-150 kilograms of lime slurry per acre is sprayed on the whole pond to remove water pathogens.
Anti-escape facilities are 50-60 cm high to escape the wall, 10-20 cm buried in the earth, materials available cement boards, calcium plastic panels, asbestos tiles and so on. Into the water outlet with a tight wire mesh or plastic net tightly sealed, in order to prevent the escape of farm objects and the enemy entered with water.
The planting of Spirulina spp. is currently used in the method of cutting the stems and cuttings of the Elodea tuberculosis. The pool water is maintained at about 30 centimeters and the row spacing is 3 meters and 4 meters. The distribution area accounts for 2/3 of the total pool, and the time is at the end of February and early March. The snail can adopt the one-time input method or the fractional input method to allow it to reproduce naturally and serve as a live feed for crabs and can remove some residual feed. The one-time investment method puts 300-400 kg of live snails into the ponds before and after the Ching Ming Festival. The split investment method uses 100-200 kg per mu before and after the Ching Ming Festival and runs every month in May-August. Live snails 50 kilograms.
Seedlings in stocking crabs should be selected as young crabs of neat specifications, robust physique, and disease-free injuries. The specifications are 90-120/kg and stocking density is 400-500/mu. In January, the crabs were kept in the holding pool and raised until mid-May. When the aquatic plants accounted for about two-thirds of the total area of ​​the pond, they were put into the pond for breeding. Before stocking, they were washed with 3%-4% saline solution 3-5. minute. In mid-June, 20-30 fishes of 5-7 centimeters per mu were planted. If more than 30 breeding stocks per mu, feed fish must be added.
The feed feed follows the principle of “meat collocation and middle fineness of both endsâ€. When you just go to the pool, feed more animal feed to strengthen your body and gradually mix with roughage until late June. In early September, the plant feed was mainly fed during the high temperature season to prevent precocious crabs. From the middle and late September, the amount of animal feed will be increased to increase the nutrient accumulation of crabs. At the same time, the development of inexpensive animal feed sources will be actively pursued to reduce costs.
The water quality controls the early stage of the pool water, and the late thin. Regularly add new water, 5 days of water injection, 10-15 days of water change, 20-30 cm of water per time in the hot season, 3-5 days for 1 time. The ph value is controlled at 7.5-8.5. Every half month to 1 month, the water depth of 1 meter per acre of water is splashed with limestone 10 kilograms of slurry. The microecological preparation is applied once every 20-30 days to improve the environment of the water. In order to ensure the use effect, the external medicine such as quick lime is used after 10 days.
The management of crab shells (1) When the oyster shell is changed, it is forbidden to change the water to avoid death due to water pressure difference or dehydration. (2) Keep the environment quiet and avoid surprises during the shell stage. (3) In the shell stage, the feed amount should be increased to prevent killing each other.
Disease prevention and control of crabs and squid are sensitive to many drugs. Therefore, the principle of "prevention as the main and prevention as the emphasis should be applied" should be adhered to in the breeding process. When choosing drugs, improper use of drugs can lead to unnecessary economic losses.
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