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Detailed Guide to Breeding Crab Breeding Techniques

Field crab has the scientific name Somaniathelphusia sinensi, widely distributed in freshwater, plains, midlands and mountainous areas of Vietnam. Field crabs breed year-round if the environment is favorable, focusing on spring, summer and autumn. Let’s find out the effectiveness as well as the breeding crab farming techniques quickly bring high productivity through the following article.

  1. Preparing the farm

Choose farming fields: flat terrain, good water retention, abundant water sources, convenient water supply and drainage, unpolluted water quality, soil quality is meat soil.

The area of ​​each field from 1/3 ha to 2/3 ha is medium, too small, the water quality is unstable, too large, too difficult to manage.

The field for breeding crabs should be a flat location with good water retention
The field for breeding crabs should be a flat location with good water retention

Dig a temporary farming ditch in the corner of the field or at the edge of the field, 4-6 m wide, 1 – 1.5 m deep, about 3-5% of the field area.

Dig the surrounding ditch and the middle ditch. The ditch surrounds the foot of the bank in 1m, 0.8 – 1.0m deep, 3 – 5m wide. If the field is large, dig more in the middle of the field in the shape of a “cross” 1-1.5m wide, 0.5-0.8m deep. The total area of ​​all three types of ditches accounts for about 15-20% of the field area.

Use the soil to dig a ditch to make the edge of the field taller and bigger. Be sure to hammer the soil tightly so that the water can leak out. The sluice gates of water supply and drainage must be blocked with suitable tubes or nets, and the sluice foundation must be compacted.

Place nets around the field. If the net is made of thin nylon, it is necessary to drive the piles 40-50cm higher than the shore, tie the ends of the piles with steel wire, fold the nylon sheet over the steel wire to let it hang into the ground in 2 layers and then bury it 15 minutes deep in the shore soil. – 20cm. If the barrier is made of plastic or fibrocement… then just bury it in the ground 15-20 cm, the top is at least 40cm higher than the ground, the four corners are curved.

Use quicklime with the content of 75 – 105 kg/1,000m2 to mix water evenly throughout the ditch.

Plant water grass to cover the bottom of the ditch and release floating plants such as duckweed, water copra, duckweed… about 1/3 of the water surface.

  1. Stocking

The time for stocking crabs is from about February to April every year.

Seeds are required to be healthy, not injured.

Density: if seed size is 100 -150 fish/kg, stocking density is 750 fish/1,000m2; or if the seed size is 300 – 600 pcs/g, then stock 1800 pcs/1,000 m2.

Seeds should be stocked into temporary farming ditches before rice transplanting to prolong the growth time of crabs. When transplanting is complete, wait until the daughter rice period, then increase the water to the rice field so that the crabs can go to the field to eat.

The selection and stocking of field crabs should ensure that the most basic requirements are met
The selection and stocking of field crabs should ensure that the most basic requirements are met
  1. Feeding

Food: Crabs are omnivores with a preference for animal foods. They like to eat molluscs such as clams, snails, mussels, trash fish. If there is a lack of food, they will eat each other, especially freshly peeled crabs. Crab feed is usually harvested on-site. Before stocking, it is recommended to fertilize at the edge of the ditch with the amount of 300-450 kg/1,000m2 so that the zooplankton develops as food for the young crabs. From the 4th month, seed snails should be released into the field (450-600kg/1,000m2 or stocked with egg-hugging shrimp to breed into baby shrimp as food for larger crabs.Also, processed foods can be used. medium seeds with high nutrition, if possible, make use of trash fish and animal waste to reduce costs.

Feeding: Based on the season, water temperature and growth stage of crabs to feed reasonably.

+ From March to May, crabs mainly eat refined food. Food should be made into small dough balls. The amount of food is from 20 to 30% of the weight of the crab.

+ From June to September, crabs eat well and grow quickly, so they need to eat more seaweed, cassava, supplement with pellets or homemade food from trash fish.

+ From October onwards, it is necessary to increase food from animals. The amount of food is from 7 to 10% of the weight of the crab.

+ Feed crabs twice a day, early morning and evening. 20-40% in the morning, 60-80% of the total daily feed in the afternoon.

+ Need to put feeding sieves at some points in the ditch to check the amount of food of crabs. Based on the weather, temperature, and prey eating situation of crabs to regulate daily food intake.

  1. Take care

Water in the field must always be from 5 to 10 cm deep. If the water is too fatty, the water must be changed. From June to September, change the water once every 2 days, from March to May and from October onwards, change the water once a week. Each time change from – 1/3 of the field water

Periodically apply lime to supplement the amount of lime in the water, usually every 15-20 days, the amount of quicklime is 22kg/1,000m2.

Pay attention to adjust the amount of water grass at a certain density. Periodically check the ditch to detect disease-causing pests, clean up leftovers, dead crab carcasses, and ensure clean water.

Farmers need to periodically check the quality of water to promptly treat if there are diseases
Farmers need to periodically check the quality of water to promptly treat if there are diseases
  1. Harvest

Harvest time is mainly in October. However, it is advisable to prune the large crabs first, keep the small crabs for further rearing.

We look forward to the information we share. You will have the most basic techniques to successfully build your field crab farming model. Thank you for your interest in following the article.

Emilia Chaney
Emilia Chaneyhttps://agrisearch.net
My name is Emilia Chaney. I'm a social girl from Romania with a big smile and 3 passions: Agriculture, Travel and Social Media. I try to make this blog practical, full of great advice and inspiring ideas.

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