What are the cultivation techniques for cultivating Scylla serrata in cement ponds?

Scylla serrata, commonly known as Scylla, belongs to crustacea, Portunus and Scylla. Its fast growth, strong adaptability, delicious meat and rich nutrition are important economic crabs in China. In China, the number of blue crabs is relatively large in the coastal areas of Zhejiang, Fujian, Taiwan Province, Guangdong, Guangxi and Hainan provinces south of the Yangtze River, and the largest individual in the natural sea area can reach more than 1kg. China has a long history of artificial culture of blue crabs, especially in recent years, with the rapid development of marine aquaculture and the continuous expansion of aquaculture area, blue crabs have become one of the main species of marine aquaculture.

1. Culture method Because the blue crab has its specific ecological habits, and the sea conditions, crab seedlings, bait supply, culture technology management level and commercial crab sales channels are different from place to place, the culture methods of the blue crab are also varied. There are pond farming, enclosure farming, crock farming, wooden box farming and fish farming. According to the mode of operation, there are rough cultivation, semi-intensive cultivation and intensive cultivation. The polyculture of Danyang River can be divided into polyculture of shrimp and crab, polyculture of fish and crab, polyculture of crab and shellfish, polyculture of fish, shrimp and crab and polyculture of blue crab with various aquatic economic organisms. ?

? 2. Conditions of aquaculture ponds and preparation before stocking? 2. 1 Conditions of aquaculture ponds

The crab pond should be built in a calm, fresh water-injected, pollution-free inner bay or sandy mudflat with a certain inclination below the mid-tidal level, and the water depth of the crab pond should be 0.8- 1 m during dry tide. The area is generally 2-5 mu. The area is too large, drainage and irrigation are difficult, and a lot of manpower and material resources are needed. The bottom of the pool is square or pot-shaped. If the water in the pool is shallow, it is necessary to dig circular ditches and cross ditches to facilitate the activities of the blue crabs and create an environment that is cool in summer and warm in winter to facilitate the growth of the blue crabs. Sediment is preferably sand and mud, and sediment is also acceptable. ?

? 2.2 Preparation before stocking

The pond should be cleaned and disinfected before stocking. The old pond should be thoroughly cleaned up, including cleaning up the silt in the ditch, draining the pond water, repairing the surrounding escape prevention facilities and breaking the dam. 65, 438+00 days before stocking, 65, 438+020kg of quicklime or 65, 438+05 kg of bleaching powder were used to make suspension for spraying in the whole pond to kill pests in the pond.

3. Selection and stocking of crab seedlings? 3. 1 crab seedling source

There are two sources of crab seedlings: one is the big-eyed larvae obtained by artificial breeding, and the young crabs with suitable specifications are cultivated through the middle; The second kind is crab seedlings or young crabs caught from natural waters.

3.2 Selection of crab seedlings

High-quality seedlings have complete limbs, strong physique and no disability, the foot muscles are blue, the muscles between the limbs are not sunken and elastic, the carapace is blue and green, and it is hard to catch; Poor quality seedlings have dark green or green carapace, and some abdomen and feet are brownish red or rust-colored, and their feet are defective. Crab seedlings with less than three legs, defective swimming claws, thorns, hooks, sunburn or trauma are not suitable for seedlings. The parasitism of crab slaves will affect the growth and development of crabs, so be careful to remove them before stocking.