Detailed explanation of the main technical points of hairy crab culture in 2019!

In recent years, hairy crab, as a medium-and high-grade aquatic product, has gradually opened its sales and breeding market. at present, it is also one of the aquaculture projects encouraged and supported by the state. It is expected that the culture area of hairy crab will be further expanded in 2019. So what are the key technical points of hairy crab culture? Let's explain this in detail.

What are the growth habits of hairy crabs?

1. Cave life

Hairy crabs, also known as Chinese mitten crabs, usually live in caves, like clear and healthy water environment, are very responsive to the outside world, like light very much, usually hide in aquatic plants during the day and come out at night to look for food.

2. Water quality requirements

The general requirements for water quality of hairy crabs are pH7.5~8.5, the suitable temperature is 1530 ℃, and the requirement for dissolved oxygen in water is similar to that of fish, about 3mg/L. If the water temperature is below 10 ℃, you will spend the winter in a cave.

3. Food requirements

Hairy crabs are gluttonous and hungry. Fish, shrimp, mussels, snails and insects are their favorite foods, and they also like to eat a variety of aquatic plants.

Second, what are the key points of hairy crab culture?

1. Choose a suitable breeding site and water source

In the site selection, we should choose sufficient water source, convenient drainage and irrigation, relatively independent inlet and drainage system, no pollution source in the square 3km, good water quality, and clay is the best geology. Anti-escape facilities need to be set up around the breeding pond.

Usually the suitable pond area is 0.33~0.67hm2, at the same time, the water level of the pond should be above 1.5m, and a shallow beach area should be divided in the pond waters, accounting for about 25% of the total pond area.

2. Aquatic plants should be planted before releasing crab seedlings.

Hairy crabs usually like to live in waters rich in aquatic plants and clear water quality. The amount of aquatic plants determines whether hairy crabs can grow healthily. Therefore, plants such as bitter grass and Elodea can be planted in the pond, and these aquatic plants should be ensured to cover more than 60% of the total area of the pond in the later stage of crab growth.

3. The seedlings of hairy crabs should be selected.

(1) it is necessary to choose a reasonable proportion of male and female crabs, and basically maintain the same number, which can promote the healthy growth of hairy crabs.

(2) to reasonably choose the quality of crab seedlings, not too large, preferably about 100g, for female crabs to choose a relatively small one. When selecting seedlings, observe the external characteristics of hairy crabs and pay attention to get rid of the seedlings with blackened belly and yellowed back.

As for the release time of crab seedlings, generally speaking, the effect of releasing crab seedlings in winter is obviously better than that in spring, summer and autumn.

4. Pay attention to daily management

Hairy crabs are omnivorous animals, and the feed should be proportioned in accordance with scientific methods. Nutritionally balanced feed can help hairy crabs better adapt to the environment and improve their chances of survival. Aquatic animals such as small fish, shrimp and field snails in the water will bring more nutrients to the growth of hairy crabs.

In addition to a balanced diet, daily check for death from illness, freezing to death in the pond,

Amputated hairy crab is also an important work to ensure the basic quality of hairy crab.