The technology of three-dimensional box culture of swimming crab the culture yield of swimming crab per mu

Fresh swimming crab is one of the favorite foods for many people, not only because of its tender meat and delicious taste, but also because of its high nutritional value. As more and more people like swimming crabs, so let swimming crabs become a new bright spot in the breeding project. So do you know how to raise swimming crabs? How high is the annual output of swimming crabs?

Three-dimensional box culture technique of swimming crab

1. Bait

Swimming crab is mainly based on animal bait, and it is better to feed low-value shellfish in large area culture, followed by fresh miscellaneous fish. The daily food intake of young crabs weighing 0.8 g is 80% of their body weight, and that of individuals weighing 30 g is 20% of their body weight. Combined with the actual artificial culture of swimming crab, the feeding quantity and time should be reasonably adjusted according to the growth needs of swimming crab.

2. Water quality management

The survival rate of crystal clear ponds is low, so it is necessary to properly fertilize water in the process of culture, so that the transparency of pond water is about 30 cm. In addition, keep changing water every day.

3. Male and female separate culture

The cultivation rate of male and female mixed culture is very poor, and the price of female crab is more than 2 times higher than that of male crab in winter. Considering the different market value of male and female swimming crab, as well as the interaction between male and female swimming crab in the growth process. In most cases, in order to improve the overall yield and sales value of swimming crabs, swimming crabs should be raised separately according to different types of male and female, so as to improve the breeding effect and benefit of swimming crabs.

Culture yield of swimming crab per mu

If the survival rate of swimming crab is 70%, the specification of finished crab is 3.5 taels per mu, and the output is 600 per mu, then the total output per mu is 210 jin.

Assuming that the out-of-pond price of swimming crab is 20 yuan per mu, the profit per mu is 2538 yuan. Of course, the above costs are only estimated, and the specific profit depends on the market situation of swimming crabs. Crab is a freshwater aquaculture species widely distributed in China, which has delicate meat, delicious taste and rich nutrition.

Swimming crab culture preparation

1. Pond consolidation: pond consolidation is mainly to remove too much silt from the bottom of the pond, loosen and expose the bottom of the pond, and also maintain pond dikes, gates, canals and other supporting facilities.

2. Set up obstacles: in order to facilitate the crab seedlings to rest and hide, after renovating the pond, cement pipes, tiles, bamboo tubes and other obstacles should be put on the bottom of the pond.

3. Breeding bait: half a month after clearing the pond, the gate can be opened to enter the water. In order to prevent some pests from entering the pond, the sea water can be filtered with a sieve net of 60 meshes. The depth of the pond water is generally maintained at about 80 centimeters. After the pond enters the water, chemical fertilizer should be applied to cultivate bait organisms. Generally, N fertilizer is 1.5 kg / mu, P fertilizer is 0.3 kg / mu, and the transparency of the pond water is about 30 cm.

Culture and management of swimming crab

1. Water quality management: water should be changed every 2 to 3 days in July, every 1 to 2 days from August to September, and every 4 to 5 days in October. The specific amount and interval of water change should be changed according to the weather, water temperature and other environmental factors.

2. Bait feeding: swimming crabs are omnivorous crabs, with fresh low-value fish, shrimp, shellfish and so on as the main bait. The daily feed amount varies according to the size of the crabs. It is generally fed at about 8% of the crab's total body weight in the early stage, 12% in the middle stage and 5% in the later stage. When the water temperature drops to 10: 15 ℃ in autumn, the daily feeding amount should be 3% of the total body weight. It should be fed according to the principle of feeding once in the morning and evening, less in the morning and more in the evening. When the average water temperature is below 10 ℃, no bait is needed.

3. Pond patrol management: inspect the pond once in the morning and evening, carefully observe the feeding and activities of swimming crabs, pay attention to the changes of pond water, check the residual bait in the pond, and adjust the amount of feeding and water exchange in time. Pay attention to weather changes at any time and make preparations for flood control and typhoon prevention. Always check the barrier and dam of the gate to see if there are any breakages and loopholes, and repair them as soon as possible if problems are found.

4. Timely harvest: the harvest time of swimming crab should be at the end of autumn, and it should be harvested in time when the water temperature is below 15 ℃ and no longer gain weight. Timely catching swimming crab is the key to high quality, high efficiency and high yield. The starting time should be determined according to whether the swimming crab enters the paste crab season, the sales price and the weather conditions. Generally speaking, it is better to start the arrest in December, and the arrest should not be made in rainy days. Crabs can be caught in crab cages or net at night when a small amount of crab comes out of the pond. When leaving the pool in large quantities, the net cage bag should be fixed at the gate, and the low tide should be used to release water to make the swimming crab flow into the cage bag. When the water in the pond is discharged to the lowest level, the iron rake can be slowly raked along the bottom of the pond. Pick it up carefully when you encounter a crab, and use a cheat sheet net to get into the basket or bucket. The swimming crabs to be caught should bind their feet with rubber bands to prevent each other from biting or escaping in baskets or buckets.

As we all know, the adaptability of crabs is very strong, and the scale of breeding crabs has become larger and larger in recent years, which has brought considerable economic benefits to many farmers, so if you want to start a business, breeding swimming crabs is a very good choice!