What is the correct way to raise crabs?

1. The pond must be arranged in the hall with good land water and air permeability: if you want crabs to grow well, first of all, the pond conditions must meet their growth requirements. We should not only choose clay, sand and other soils with good air permeability, convenient drainage, and no pollution of water quality, but also pay attention to the depth of the pond water, the slope of the pond and other issues.

Remember, the depth of the pond should be kept to the left and right, and the slope of the pond should not be too steep, otherwise it will not be conducive to the crabs' nocturnal water activity. If conditions permit, you can choose to build artificial caves.

2. Plant aquatic weeds: aquatic weeds are related to the yield of river crabs, so we must plant aquatic weeds. There are many types of aquatic plants, the common ones are duckweed, water hyacinth, black fish algae, bitter grass, etc.

3. Pay attention to prevent crabs from escaping: pond breeding crabs are prone to the phenomenon of crabs escaping, so we must do a good job of preventing and resisting the escape measures, we can use plastic films, cement boards, etc. according to the breeding situation.

4. The pond must be cleaned and disinfected: the disinfection of the pond is to make it better for crabs not to grow and not to get sick. Before the seedlings are released, we can disinfect them with quicklime, which can not only improve the microbial structure of the bottom of the pond, but also kill predators.

5. Select seedlings and release seedlings: The crab seedlings of crabs are related to the worst of crabs, so we must choose crab seedlings that are healthy, lively, and neat in size. When stocking seedlings, we should pay attention to the stocking density and temperature, and the ones that have just been bought can not be directly put into the pool, but should be soaked several times first, and then put into the pool after full adaptation, so that the survival rate is higher.

6. Bait: When breeding crabs in ponds, they are mainly fed by artificial feed, so choosing the right feed is the key, and small trash fish of animal nature can generally be selected; Plants, aquatic plants, bitter grasses, etc.; Commercial cereals, potatoes, etc.

<>1. Pond crab farming.

Crabs are cultivated in ponds, and the whole artificial reproduction process can be controlled, and the recatch rate is very high, but the size and meat quality of the ponds are not as good as those cultivated in large water bodies. According to the breeding method, it can be divided into:

1. Pond monoculture: mainly crabs, with some fish. The average yield per mu is about 50-75 kg, and high-yield ponds can produce up to 200 kg of crabs.

2. Fish and crab polyculture: mainly fish, some crabs. In general, crab yields are about 15 kg per mu, and high-yield pools can reach up to 40 kg.

3. Pond rearing: This is a kind of green crab that has not been taken out of natural water bodies or other ponds, due to its soft shell and low **, they have matured and shed their shells during the holding period, so they will not kill each other. Therefore, the pond temporarily rears blue crabs, which have a high survival rate.

Green crabs are raised from 2 to 3 months, the crab body is obese, the gonads are sufficient, and the market ** is significantly improved. The yield per mu can reach more than 500 kg, and the benefits are remarkable. However, this method of farming can only be carried out in areas where crab resources are abundant.

2. Crab farming in lakes and ditches.

Crab species are raised in natural disturbed waters, with good environmental conditions, sufficient natural bait and low cost, crab size is large, ***. But the recapture rate is low. According to the current breeding methods, it can be divided into:

1. Crab seed release in lakes and rivers: This breeding method has a history of decades, and crab seedlings were discharged in lakes and ditches in the 60s and 70s; In the 80s, it was changed to stocking young crabs; In recent years, in addition to stocking crabs, stocking one-year-old crabs has also had significant effects. However, this type of farming is usually not fed bait, and its production results are greatly influenced by natural factors and are still a widespread method.

The water quality of stocking requires good water quality, dense vegetation and gentle flow rates, and the outlet that communicates with the outside world has better benefits. In general, the catch rate of crabs is only to 5%.

2. Lake net enclosure crab farming: choose the aquatic plants in the lake to be lush, the water quality is good, the water flow is mild, the water depth is moderate, the mesh arch forms a certain area (dozens of acres to hundreds of acres), and the crabs are fed intensively according to the growth requirements of the river crabs. This method of farming absorbs the advantages of pond and lake crab farming.

The water quality is good, the activity space is large, the bait is sufficient, the density is relatively thin, and the river crab is large. The recapture rate can reach 40% to 60%, with low cost and high efficiency. Typically, 15 kg to 30 kg of crab can be produced per acre, and high-yield nets can increase crab production to 65 kg per acre.

3. Raising crabs in grass swings and reed flats.

Caodang and reed beach are suitable for the growth of river crabs, with low production cost and large market scale, but low recapture rate.

In crab farming, the construction of crab ponds, the feeding of crab fingerlings, the feeding of bait and the maintenance of water are all very important. The crab pond should be built in a sunny place close to the water source, the crab hair should not be too dense, and it should be suspended, the bait is mainly plant-based concentrate, and the water should be changed regularly and the debris in the water should be cleaned up.

1. Build a crab pond

If you want to breed crabs, the first step is to build a suitable crab pond, the crab pond needs to be very close to the water source, there is enough sunlight in the place, the water depth should not be too deep, about a meter, the drainage and irrigation system should be relatively perfect, and before the planting should be planted some aquatic plants such as black wheel algae for shade and bait.

2. Put crab seeds

Crab species should be adapted to the new suspension in a small area at the edge of the pond before the release, and wait until the crab species adapt to such a water environment can be put in, the density should not be too large or too small, generally speaking, about 2,000 crab species are put into an acre is the most suitable, and the time can be around the beginning of spring.

3. Feed the bait

After stocking crab species, when the temperature rises to 11 degrees Celsius, it can be artificially fed, mainly a small amount of paste-like refined feed in the early stage, and expanded pellet feed made of vegetable protein in summer, and after August, some animal feed such as fish and shrimp minced meat and animal offal are added to help river crabs develop and mature.

4. Water change maintenance

In the process of breeding, it is generally 1-2 weeks to change the water once, with the increase in the ambient temperature and the appropriate water level, the water level should be about meters in summer, when the temperature is too high, change the frequency of water change, change the water change once in about 7-10 days, change about a quarter of the water when changing the water, and regularly clean up the debris in the water body.

<> before breeding crabs, it is necessary to provide crabs with a lot of aquatic plants to ensure that the crabs can have enough food. This not only satisfies the crab's food needs, but also allows it to adapt to its environment, promoting growth and maintaining its unique ecology. This results in healthier crabs.

Crab it is not a picky eater. Some small creatures in the water and aquatic plants in the water and other things can be its food.

In fact, for crabs, their favorite is to eat snails, which are also a kind of food that can promote the growth of crabs. Regularly stocking crabs with snails is also an important part of helping crabs grow better. The first release of snails also needs to be divided into batches, and the first release needs to put 150 kg of snails per mu, which can ensure the development and growth of crabs in the early stage.

In June, a second stocking can be carried out, and about 200 kg of snails can be stocked per mu, which can make the crabs grow more fat.

The method of interbreeding crabs, crab interculture should be intercultured with green shrimp or silver carp, which can improve the economy at the same time under the premise of not affecting each other. In addition, silver carp prefer to move in the water, which can also help the pool to improve the water quality, so that the growth environment of crabs will be better, which is very helpful for the future growth of crabs.

Water quality is a very important step in all aquatic cultures, it needs to increase the fertility of the water so that the crabs can grow in high-quality water. As a result, the meat of the crab will be fuller and the taste will be very good. In addition, if the water quality is managed, the growth of moss can be effectively suppressed, and the environment for crabs to grow will be better.