1, in the open terrain, water supply, good light in the construction of ponds, do a good job of disinfection and planting water plants and other work, and then stocking crab seedlings. 2, in the pre-farming period, you can mix the eggs and minced fish meat steamed, added to the water and mixed into a slurry, and then splashed into the pond. Later, you can feed crushed snail and mussel meat, soybean cake, soybean paste and other foods.3. Splash quicklime into the pond on a regular basis, not more than 1 kilogram per acre, and from May to September each year, you need to feed antimicrobial agents to the river crabs.

First, the technical points of river crab farming

1, site selection to build a pond

Pick the open terrain, sufficient water, good light site to build a pond, pond area of about 20-50 square meters, the depth of the pond is about 50 centimeters, the depth of water is about 30 centimeters. The pond should be sterilized before use, after which water plants need to be planted, and finally crab seedlings can be put in.

2, feeding management

In the early stage of aquaculture, you can mix the eggs and minced fish meat in the ratio of 1:5 to steam, and mix with water to form a slurry, and then splash into the pond, every 4 hours to feed. Later, you can feed river crabs crushed snail and mussel meat, bean cake, soybean paste and other protein foods.

3, crab disease control

Breeding river crabs need to regularly splash quicklime on the water surface to eliminate bacteria, the amount of splashing per acre is controlled at 10 kilograms or less, and if you find diseased crabs, dead crabs, you have to fish them out and isolate them immediately. You can feed antimicrobial agents to river crabs from May to September every year to improve their resistance to disease.

Second, how long is the culture cycle of river crabs

1, the culture cycle of river crabs

The culture cycle of river crabs is generally not more than one and a half years, the life span of river crabs is shorter, they only have one reproductive cycle in their life, and the end of the reproduction of the end of life is also over.

2. The life span of river crabs

(1) The life span of river crabs is closely related to their sex, the maturity of gonads and the ecological environment. For the river crab group, the general life span is 2 years old, they have completed the reproductive migration, reproduction of offspring, will tend to die.

(2) From the big eye larvae, the male crab life expectancy is 22 months, of which 16-18 months they live in freshwater, 4-6 months in the estuary of the shallow sea water, and the time of death is concentrated in April-May.

(3) Because of the need to hold eggs to incubate offspring and other reasons, the female crab life expectancy is generally 24 months (2 full age), and the centralized time of death in June-July.