1, in the surrounding no industrial and agricultural pollution of the beach side of the construction of ponds, to be fresh, water exchange self-purification force, physical and chemical factors of the stability of the seawater to cultivate green crabs. 2, select the body of the strong shell hard, crustacean green, neat specification of the crab seedlings in the month of June-July put. 3, can be fed with red meat blue clams, duck mouthing clams, short-toothed clams, freshwater clams and artificial bait. 4, every 3-5 days to change the water. The water can be changed every 3-5 days, and the flow rate of water inlet should not be too fast.

I. Green Crab Aquaculture Technology and Management

1, choose the place of origin

(1) the site of the green crab should be built around the beach without industrial and agricultural pollution, suitable for fresh, strong self-purification of the water exchange, physical and chemical factors are stable, and the tidal difference of the seawater to feed.

(2) The pH value of the water is between 7.8 and 8.6, and the water temperature is between 10 and 30 degrees.

2. Stocking seedlings

(1) Choose the crab seedlings with strong body, hard shell, greenish carapace, neat specification and complete carapace, and stock them in June-July every year.

(2) The stocking density should be adjusted according to the actual conditions of the site, and the stocking density of adult crabs is generally 1.5-3/square meter.

3, reasonable baiting

(1) green crab is a carnivorous animal, can be fed red meat blue clams, duck mouthed clams, short-toothed clams, freshwater clams, etc., but also can be fed with artificial bait.

(2) The amount of bait should be controlled according to the water temperature, tide, water quality and the activities of green crabs.

4. Manage water quality

(1) Green crabs have to live in fresh and good water with sufficient dissolved oxygen in order to molt and grow normally.

(2) When breeding green crabs, change the water every 3-5 days, the daily water change is 1/3 to 1/5 of the whole pool water, and the flow rate when entering the water should not be too fast.

2, green crab and hairy crab which is expensive

1, green crab and hairy crab which is more expensive

(1) Generally speaking, green crab is more expensive than hairy crab.

(2) Green crabs are mostly produced in coastal cities, high cost of transportation to the mainland, breeding is difficult, and in May-July each year, the sudden rise and fall of seawater makes it difficult to be suitable for a higher mortality rate.

(3) And hairy crabs generally have breeding grounds in the mainland, the number is larger, so the price is relatively cheaper than green crabs.

2, the difference between blue crabs and hairy crabs

(1) belong to a different

① blue crabs are arthropods in the pike family, its shell is mostly oval, flat body without hair, often in the mud mud as well as near the shore in the shallows.

② hairy crabs are bowed crabs of the family velvet crabs genus, the back of its head and chest covered with a layer of hard armor, the general color of the dorsal armor is black-green or ochre yellow.

(2) habitat habits are different

① green crabs like to live in the rivers, streams and seas back to the mouth, or the sea and fresh water buffer exchange mud flats, they often dive during the day to live, the night will be active foraging.

② Hairy crabs in the case of sufficient food, in order to avoid the enemy and cave life, in the environment is not suitable for hairy crabs to establish a cave, they will be in the cracks of the rocks and water plants in the habitat. Hairy crabs prefer to hide by day and travel by night, and generally feed on animal carcasses or grains.