The cultivation method of river crabs, how to breed crabs

Construction of ponds: Ponds are built in locations with sufficient water sources, good water quality, and convenient drainage and irrigation. Planting aquatic plants:

Aquatic plants such as duckweed, water hyacinth, and water lotus are planted in the waters. Stocking crab seedlings: Soak the crab in water repeatedly and wait for it to adjust to the water temperature before putting it in the pond.

Daily management: Regularly sprinkle quicklime into the pond to improve water quality.

1. Build ponds

River crab is suitable for breeding in the position of sufficient water source, good water quality, convenient drainage and irrigation, the soil at the bottom of the pond is suitable for clay, sand or sub-sandy soil, the silt at the bottom can not exceed 20 cm, and the surrounding cement board is used to prevent escape, and the pond is disinfected with quicklime half a month before the seedlings.

2. Plant aquatic plants

The number of aquatic weeds and benthic organisms in the pond determines the yield of river crabs, and aquatic plants such as duckweed, water hyacinth, water lotus, goldfish algae, and dead grass should be planted in the water area when breeding, and aquatic plants such as duckweeds can not only supplement vitamins for river crabs, but also play a shading role to meet the growth habits of river crabs.

3. Stocking crab seedlings

Pick out the crab seedlings with neat size, complete steps, strong physique, active crawling, no injury and no disease, and then put them into the water to soak for 2-3 minutes, take them out for 10 minutes and soak them again, repeat the operation 2-3 times, and wait for the river crabs to adapt to the water temperature and put them into the pond to improve the survival rate.

4. Daily management

River crabs in the breeding period to artificial feeding feed, adhere to the refined, green, coarse reasonable combination of the principle, of which concentrate accounted for 40%, aquatic weeds accounted for 35%, other plant feed accounted for 25%, usually the pH value of the pond water is maintained between, regularly splashed quicklime to improve water quality.

1. Pond preparation.

Breeding ponds should be selected in a place with abundant aquatic plants, clean and clear water quality, and full of sunshine, and the area of the pond should be determined according to the number of their own breeding. Generally in about 3-8 acres, the water should not be too deep, about m, there is a good drainage and irrigation system, the pond is best hard clay, to remove the thick silt at the bottom of the pond. Set up anti-escape equipment around the pond, and in order to reduce the incidence of disease in the breeding process, the pond should be cleaned and disinfected when stocking crab seedlings.

15 days before stocking, quicklime was used for sprinkling and disinfection of the whole pond, and the dosage per mu was about 75 kg. Quicklime can not only kill the germs in the pond, but also effectively increase the calcium ions in the water body and improve the bottom of the pond.

2. Select seeds and put seedlings.

When choosing crab species, you should choose excellent and pure varieties, and you can't choose miscellaneous crabs, injured or sick crabs, or mutilated limbs. Crab species should be well-grown, well-developed, with complete appendages, no injuries and no differences in size. The purpose is to ensure the quality and survival rate of river crabs.

In order to let the crab seedlings have an excessive adaptation period, a temporary breeding area is set up in the pond, which accounts for about 1 5 of the entire pond. Pay attention to the stocking density, the density should be moderate, to ensure the normal growth and development of river crabs, and control the density at about 2,000 per mu. The stocking time is generally around the beginning of spring.

3. Feed feeding.

When breeding river crabs, it is necessary to feed some feed appropriately, because only the river crabs can not meet the growth and development of river crabs and achieve the purpose of high yield. After stocking crab fingerlings, when the water temperature in the pond reaches 11 degrees Celsius and above, it needs to be fed manually. When putting it, it is necessary to feed the early concentrate, the middle coarse material, and the late meat feed, and in the spring, a small amount of paste bait should be fed, and in the summer, it is necessary to feed the plant-type feed.

After August, it is necessary to start to increase the amount of animal meat, the main purpose is to promote the development of gonads, increase the weight of river crabs, and make their meat more delicious.

4. Water quality management.

Water quality has a very important impact on the growth and survival rate of river crabs, so it is necessary to do a good job in water quality management. When stocking crab fingerlings, it is necessary to ensure that there is a certain fertility in the water, and the fertility cannot be reduced, so water should be added at least once a week in the breeding. In addition, the water level should be deepened as the temperature rises, and the water level should be at least m in July, and the frequency of water changes should be increased or decreased when the temperature rises.

In summer, the water should be changed at least once a month from May to June, and at least once a week from July to August. Each time you change the water, you don't need to change the whole pool water, you can change about 30%, and you also need to splash quicklime regularly. It's about once every 15 days, and the effect was mentioned earlier.

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.