The swimming crabs are at their fattest from August to November every year. This period is the feeding and fattening period of the swimming crabs. The individual swimming crabs are the most robust, with a body width of 100-130 mm and a weight of Up to 250-500 grams.

When choosing crabs, the crab shell should be green, the belly should be white, and not black. In addition, you can look at the belly button and two sharp corners of the crab to see if there is light red. The darker the color, the better. The meat is fattier. If you really don't know how to pick a swimming crab, then "pink it". Of course, you are not asking you to compare the weight, but pinch its penultimate hind legs. This is a very important point. Good swimming crabs have all their hind legs. It is particularly hard. This kind of swimming crab is good, with enough cream and meat.

Portunus crab adapts to water temperature of 8~31℃, and the optimal water temperature for growth is 15.5~26.0℃. In different water temperature environments, the activities of Portunus trituberculatus are different. When the water temperature is below 1.5℃, they do not eat, and some individuals freeze to death in shallow water areas; when the water temperature is 0~6℃, they do not eat, and they hide in the sand day and night, showing a dormant state; when the water temperature is 8~10℃, they start to stop feeding, and their mobility is weak. Lurking in deep waters.