How to raise little sea crabs

Sea crab generally refers to three verrucous swimming crab, also known as swimming crab, gun crab, sea crab, widely cultivated in China, March-May and September-October are the peak production season. Then how do you raise it?

How to raise little sea crabs?

1. Pond cleaning preparation

Select a pond with a depth of more than 5 meters near a sea area with adequate water sources, no pollution, rich resources of small miscellaneous fish and shellfish, and convenient access and drainage, first remove excessive silt from the bottom of the pond, loosen the bottom of the pond, and maintain relevant culture equipment; then set up obstacles to facilitate the rest and hiding of small sea crabs; then disinfect them with drugs on a sunny day, and inject water after disinfection is completed.

two。 Release of crab fry

Crab seedlings with neat specifications, strong physique, complete appendages, strong vitality and soft shell rate less than 10% were selected and put into the culture pond from late May to mid-June. The water temperature should be above 18 ℃, the daily temperature difference should be less than 8 ℃, the salinity should be 18-32, the pH should be 7.8-8.6, the content of ammonia nitrogen should be less than 1 mg / L water body, the dissolved oxygen should be more than 5 mg / L water body, and the transparency should be kept at 30-40 cm. Generally, the stocking density of 80-100 crab fry / mu should be controlled at 1000-1500 / mu.

3. Feed feeding

Take fresh low-value fish, shrimp, shellfish, crab and so on as the main food. The daily feeding amount varies according to the size of the crab. It is generally fed at about 8% of the total body weight of the crab in the early stage, 12% in the middle stage and 5% in the later stage. When the water temperature drops to 10: 15 ℃ in autumn, the daily feeding amount should be 3% of the total body weight. It should be fed according to the principle of feeding once in the morning and evening, less in the morning and more in the evening. When the average water temperature is below 10 ℃, there is no need to feed.

4. Daily management

Step up patrols in the morning and evening, and be clear about the changes in the pool water, eating, and so on. In addition, in July, the water should be changed every 2 murals every 3 days; from August to September, the water should be changed every 2 days, and in October, the water should be changed every 5 days. The specific amount of water and the interval between changes should be based on the weather, water temperature and other environmental factors.

In addition, the growth of sea crabs should be measured regularly and adjusted accordingly according to different conditions.