CATDOLL : CATDOLL: What are the technical methods for breeding high-quality river crabs in rice fields?

What are the technical methods for breeding high-quality river crabs in rice fields?

When using rice fields for crab farming, you should choose 3 to 10 mu of rice fields as crab fields. If the field is too small, the crabs will lose their space for activities, and if it is too large, it will be difficult to manage. In addition, you need to ensure that the selected field has sufficient water, and the water injection and drainage should be convenient, and there should be no leakage, and the water retention performance should be good. When placing crab seedlings, you should choose high-quality river crabs with strong physique, complete appendages, no disease or injury, no attachments, neat size and specifications, and agile activities. It is best to airlift them directly from the place of origin to increase the survival rate of river crabs. You can install a protective net under the rice field to prevent the crabs from escaping, and put a lot of crab food under the water as nutrients. The crab excrement can also promote plant growth.

Crab farming in rice fields is a project to enrich the people by taking advantage of rice field resources and adjusting the fishery structure. It is an effective way to increase fishermen's income and a new highlight of rural economic growth.

1. Standards for raising crabs in rice fields. Choose low-lying fields for raising crabs in rice fields. Each field has an area of ​​15-25 mu, and the area of ​​the ditch accounts for more than 25% of the total area of ​​the field, up to 50%. The ditch is 6-8 meters wide and 1.5 meters deep, with a large slope.

2. Stock crabs early . Stock high-quality crabs, with a crab size of about 100 crabs per kilogram. Stock them in rice fields from March to April, with 700 crabs per mu. In addition, stock silver carp with a size of 150 grams per mu, with about 30 fish.

3. Planting aquatic plants. In order to create a good ecological environment, aquatic plants are planted or transplanted in the crab ditch. The varieties include Hydrilla verticillata, water peanut, Elodea, etc. The coverage area of ​​aquatic plants accounts for more than 50% of the area of ​​the crab ditch.

4. Feeding. Feed mainly pellet feed, the feed formula is 25.5% fish meal, 35% bean cake, 10% rapeseed cake, 28% wheat flour, 1.5% crab premix, and 5% adhesive to make pellet feed. Feed some fish, shrimp and other animal feeds in the early and late stages. The daily feeding rate is controlled at 5-8% of the crab's body weight. Snails can be transplanted in the crab ditch for crabs to eat. When feeding wheat, it is best to feed it after germination. All feeds are fed at multiple points, mainly once in the evening, accounting for about 70% of the whole day, and the feed is thrown in shallow water.

5. Frequent watering. From July to September, river crabs grow vigorously. Flush water once every half month, 15-20 cm each time, to keep the water clean, with sufficient oxygen, to form micro-currents, and to promote the molting of river crabs.

6. Sprinkle quicklime regularly. Sprinkle once every half month, 20 kg per mu each time, to regulate water quality and increase calcium.

7. Do a good job in crab disease prevention. Usually, medicated bait is fed once every half a month. The drugs mixed into the feed include soil mold and four disease spirits. No major crab diseases have been found in the whole breeding process.

8. Harvest and sell at the right time. Harvesting can begin in October and is usually completed in mid-November. The crabs are sorted by size and placed in temporary cages for sale based on market demand.