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Serrata blue crab is abbreviated as blue crab. It is a marine crustacean with high economic price. In recent years, it has been one of the main targets of marine aquaculture. It has been rapidly promoted in the coastal areas south of the Yangtze River, and most of the breeding methods are mainly pond culture. Pond culture can be divided into monoculture and polyculture. This article focuses on monoculture of ponds. There are other breeding methods for blue crabs such as hood net breeding, box raising and so on. Now introduce the pond culture techniques of blue crabs: 1. Pond environment Saw green crab ponds are mainly earthen ponds, the pool depth is 1 meter, the ring ditch depth is 1.5 meters, the area is 10-50 acres, generally 10-20 acres Right and left is appropriate; the bottom of the pool is sand mud bottom, in order to prevent self-mutilation of blue crab shells, obstacles and artificial caves, pottery pipes, cylinder plates, “crab islands†and other hidden objects can be set in the bottom of the pool to prepare the blue crabs. The clam shell hides and escapes predators; there is a 50-cm high anti-escape facility around the pond. Second, the pond disinfection treatment Crab before stocking must be dredging in advance of the pond, and after exposure, the end of March to early April water 20-30 cm, beach coverage, per mou with tea seed cake 2-3kg soaked evenly after the full The pool (used to kill the enemy's harmful organisms), and then use quicklime 50 kg per acre full Quanchiposa, soak for a week, drainage and dry water after receiving. Clear pond work has a very important role in the future breeding process, on the one hand, it can reduce predators and kill harmful bacteria, improve the survival rate of blue crabs, on the other hand, it also has a certain role in maintaining water quality. Third, nurture the basic biological food 15-20 days before stocking crabs, filter the water with 60-mesh sieve, apply 1.5-2 kg of urea per mu, and distribute them 2-3 times to master the principles of less application and diligence. Keep the water yellow-green or tan. General fertilization time should be sunny at noon, rainy days and morning and evening should not be fertilized. Fourth, crab stocking In order to develop commodity crabs in the past, we should make full use of natural large size crabs or early batches of artificial seedlings. The stocking density should be based on the seed size, stocking time, bait and water quality, and other reasonable arrangements. In stocking in May, 800 to 1200 animals were stocked per acre when A is 2-3 centimeters wide, and 0.5 kg per acre was hatched after being stocked for about 10 days. Fifth, after the management of crab seedlings, management is the key. If you can produce high yields, it depends on whether or not you have scientific management methods. 1. Water quality management Good water quality is the key to successful breeding. Good water quality prevents the occurrence of multiple diseases. Attention should be paid to several physical and chemical indicators of water quality in the breeding process, such as dissolved oxygen, salinity, pH, water temperature, transparency, etc. . How can I maintain good and stable water quality in my culture? Mainly the following points should be noted: 1 Clear pond work before stocking should be in place, remove excess silt and disinfect. 2 changing the water: changing the water is the most economical and effective way to improve the water quality environment. The best time to change the water is in the morning and evening, and it is better to open the sun than the noon to avoid changing the temperature difference. When the tide is high, it is necessary to thoroughly change the water 1 to 2 times. 3 The feeding should not be overdone, try to put some fresh bait and full-price ingredients in order to avoid the residual baits damaging the sediment, causing deterioration of water quality. 2, feeding bait Shouqing Department of chow chow partial carnivorous, bait to fresh fish, shrimp, shellfish and compound feed. In the early stage, they mainly feed blue hag, plum baby fish and feed; in the middle and late period, they mainly feed fresh small junk fish and compound feed; generally they feed two times at sunset before sunrise every day. You can choose to cast fresh bait in the morning and feed in the mix in the afternoon, or you can feed them in one piece, preferably all in the form of compound feed. Feeding amount can be flexibly controlled according to water temperature, tide, water quality, residual bait and blue crab activity. In general, the pre-feeding period accounts for about 15-18% of the total weight of the blue crab, 10-12% in the middle period, and 5-85 in the later period. Attention should be paid to the distribution of the amount of feed in the early morning and the daily amount of feed should be allocated to the daily amount. 20-40% of the evening, the amount of feeding in the evening accounted for 60-80% of the daily feeding amount, and if the amount of daily feed is reduced when fed with compound feed, the previous period: 8-10%, medium-term 5-8%, late 5-8%. 3. Routine management Every morning and evening, each inspection will be conducted to check if the facilities for preventing escape from surrounding the pond are damaged, whether there are loopholes or gaps in the gates or dams, observe the changes in water quality, check the feeding conditions of the crabs, whether the activities are normal, and find the problems in time. . Every 15 days of isolation, the weight of blue crabs was randomly sampled in order to grasp the amount of feeding in time. 4. Disease Prevention In the breeding process, the concept of “prevention as the main and treatment as the shop†should be established.