Hairy crabs like to have fresh water, abundant sunshine, and rich aquatic plants, inhabiting the mud in river irrigation and river bank lands, and eating small fish, shrimp, snails, crickets, insects and animal carcasses. At temperatures below 10 degrees Celsius, the crabs crouched in winter and eat less or not. Autumn and winter each year, mature crabs of the gonads carry out genital migration.
Field project
Choose a quiet environment, adequate water supply, good water quality, no industrial pollution, easy access to water, large flooding, drought-free, strong water retention field. Tian Hao is demanding and does not collapse. It is more than 1.5 meters wide. The area of ​​paddy fields can be as large as small, about 10 mu. Dig a ditch about 2-3 meters away from the inside of the ridge, 1-2 meters wide and 1.0 meters deep, with a slope of 1:1.2. The size of the field block digs the “Ten†or “well†word car ditch. The car ditch is connected with the outer ring ditch. The car is planted on the car surface and the crab is raised in the ditch. At one end of the field, a temporary holding pool with a depth of 1.5 meters and an area of ​​5% of the field was built. The field project accounts for 15%-20% of the paddy field area. Inlet and outlet openings are diagonally arranged, and sieves are used to sew the nets. Grooves and ponds are planted with water spinach or aquatic plants. Coverage is controlled at 30%-50%.
The fences are surrounded by smooth and durable materials such as calcium plastic plates or plastic films. The upper part is 40-50 cm above the ground and 10 cm under the soil. The outer side is secured with a wooden stake or a strong rope. Anti-escape film does not appear pleats, joints smooth without leaving any gaps.
Crab species stocking
Crab species require complete limbs, robust physique, neat specifications, strong activity, and no disease. The specifications are not less than 60-100 per kilogram. Before and after the Ching Ming purchase of crab species (most purchased from coastal origins), first raised in the holding pool. If the long-distance transportation comes back from the crab species, it should be soaked in water for 3 minutes first, then raise the water surface for 10 minutes, and then repeatedly put into the water several times. After the seedlings return to green, the crab species will be soaked with formalin at 50-100 mg/l. Minute disinfection and then put it in Daejeon. All fields are scattered, and the average mu stocking is 15-20 kg.
Feeding management
I. Rice Management
The high-yielding rice varieties with strong fertility resistance, hard and hard straw, and disease resistance are selected. Wide rows of dense plantings were planted, and the planting density was appropriately increased at the edge of the fields, and the marginal space was used to increase the yield of rice. One-time application of base fertilizer before transplanting, generally do not have to top-dressing. Rice field crabs must be used with caution, and the seedlings should be sprayed 1-2 days before transplanting. When pesticides must be used during the growth of rice, insecticidal doubles, disinfectants, and jinggangmycin can be used. Before the treatment, deepwater should be poured and then sprayed. The adherence rate of the liquid to the rice plant should be increased as much as possible to reduce the amount of liquid dripped into the field. Avoid using crabs as much as possible during use.
Second, crabs feeding crabs on the water quality requirements are higher, like living in fresh water, dissolved oxygen, slightly alkaline or neutral waters. The amount of dissolved oxygen in the water is more than 5 mg/L. The crabs can normally feed and grow. Hypoxia in water can cause food to stop and stop clams and even death. If the PH value is too low, it can also lead to difficulties in the pod and affect its normal growth and development. Therefore, timely drainage should be performed. Generally change the water every 3-5 days 1, each time about 10 centimeters of water change. The number of water exchanges and exchanges can be flexibly controlled based on factors such as crab size, water temperature, water quality, and weather conditions.
In addition to using aquatic plants and benthic organisms that grow and multiply in paddy fields, artificial crabgrass should be supplemented during the entire breeding process. Animal feeds include small fish, shrimp, silkworm cocoons, clams, snail meat, clam meat, fish meal, blood meal, slaughterhouse waste, insects, etc. Plant feeds include aquatic plants, duckweed, algae, melons, cakes, bean dregs, bran, rice bran and so on. In addition can also be fed artificial compound feed.
Feeding methods are feeding animals such as fish gizzards, pig blood, cocoons, snails, and quail meats at the initial stage of stocking. In the medium term, the plant-based feeds such as genus Pygmy, pumpkin, wheat, and bean cake should be the main products. In the later period, food should be mainly animal feed, so that the crab can accumulate nutrients and increase individual weight. Daily feeding is 5% -10%, depending on the weather, water temperature, crab feeding conditions increase and decrease, feeding the amount of the next morning check is appropriate. Feeding time is 4-5 pm every day to facilitate night feeding. The feeding site is around the ditch.
Adhere to daily morning and evening inspections. Examine crabs for food and activities, check whether the anti-escape facilities are in good condition, and infiltrate into the fields so that early measures can be taken.
Disease prevention and treatment
Take precautions. It is generally sterilized once every half month, and at the same time, additives such as additives, chitin, and antibiotics are added to the feed according to the growth and activity of the crabs to prevent disease and promote growth. Take effective measures to eradicate rats, frogs, water snakes, jaundice, birds, etc.
Timely crabbing
After rice is harvested, crabs can be caught. Water is released at night, and the light trapping effect is the best, which can reduce the mortality rate of adult crabs. The quality of the crabs is more than two or more than three, gold claws, yellow hair, green shell, white umbilical, meat, fresh, less water, the color is good-looking, less soil smell.
[special reminder]
The economic benefits of crab cultivation in rice fields are considerable, but the technical requirements for breeding are also high. Therefore, before developing crabs in paddy fields, farmers should fully understand and master related aquaculture techniques. If necessary, they should be categorized after consulting local fisheries departments.
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