Summary of Freshwater Crab Culture techniques in 2019

In recent years, the scale of freshwater crab culture has expanded year by year, and the breeding model is constantly innovating and developing in an ecological direction. Many people also want to wade in 2019. Here is a summary of the main points of freshwater crab culture technology. I hope to give you a reference.

I. requirements for the growth environment of crabs

Crabs like to live in warm and humid places, so there are certain requirements for the light intensity of the sun. Crabs need to grow healthily and normally under the appropriate intensity of sunlight. Too high or too low temperature will cause disease.

2. Selection of freshwater crab species

Generally speaking, it is necessary to choose young Chinese mitten crabs, which are physically strong, disease-free, injury-free, neat specifications, sound appendages, shiny and dynamic young crabs, and avoid using young crabs of unknown sources. this is the most important factor in breeding large crabs and improving the survival rate.

Third, plant aquatic plants ahead of time

The varieties of aquatic plants should not be single, but should be diversified. it is best to combine submerged plants, water-standing plants and floating plants and distribute them reasonably to meet the needs of river crabs in many aspects. Submerged plants can be selected as bitter grass, verticillium verticillata, Elosa, etc., aquatic plants such as Reed, Zizania caduciflora, floating plants such as duckweed and so on. The area of aquatic plants planted in crab water area should account for 50% of the water surface area.

There are many functions of raising crabs and growing aquatic plants, such as:

1. As a natural and high quality plant feed for crabs.

2. to provide a hidden place for river crabs to perch and molt, which is not easy to be found by enemies and reduce the killing of each other.

3. The photosynthesis of aquatic plants can increase the amount of dissolved oxygen in water, absorb organic matter in water, prevent water quality from eutrophication, purify water quality, keep water quality fresh and improve water culture environment.

4. Aquatic plants can play a role in shading and cooling in high temperature season.

IV. Breeding and management of crabs

1. Release seedlings

The two-year breeding model can be adopted, that is, the young crabs are purchased at the end of May and the beginning of June, and the crabs can be bred extensively in the pond at the end of the year. In the spring of the second year, these crabs can be put into the pond. Usually, the standard of crab breeding is 100m / kg. The specification and quality of river crab out of the pond can be improved by stocking 300 Mu per mu of water and adopting proper release.

2. Water quality control

When crab culture is carried out in the pond, it puts forward very high requirements for the water quality used. The pond water needs to be disinfected. Through the use of bleach to disinfect the pond, we must ensure the cleanliness of the water quality and avoid water quality problems.

3. Prevention and treatment of crab disease

The prevention and treatment of crab disease should give priority to prevention, early detection, early treatment, no disease prevention and early treatment, and different methods should be taken to prevent crab disease at different growth stages.