Swimming crabs, commonly known in some places as "white crabs". Pike, named after the pike, is distributed in Japan, Korea, Malay islands, red sea and most coastal areas of mainland China. The fishing season of swimming crab has spring and autumn twice a year, fishing period is long, yield is high, body flesh is much, flavour is delicious, nutrition is rich, especially ovarian and liver. The ovaries are used for fine dressing. Meat in addition to fresh food, can also be canned, sold at home and abroad. Shell can be used for medicine, and can extract chitin, widely used in a variety of industries. The annual output of the yellow sea and east China sea is about 10,000 to 20,000 tons each. As the most important seafood crab in China, it is of great economic significance.