1, look at the color of crab shells. The color of crab shell directly determines whether its meat quality is fat or not. Male Portunus is cyan and female Portunus is purple-brown, which is the most basic color feature. The darker the color, the fatter the swimming crab is. In addition, whether male or female, if the crab is yellow, it means that the swimming crab is thin, even an empty shell crab. This kind of swimming crab is not recommended for everyone to buy.

Step 2 weigh. Weighing Portunus trituberculatus by hand does not mean that the bigger it is, the fatter its meat is. If you choose a few Portunus trituberculatus crabs of similar size to put in your hand, the heavier the handle, the more delicious the meat, and the lighter the meat in your hand, indicating that there is less crab meat and it is not recommended to buy it.

3, pinch the crab belly and crab feet. We press the crab's stomach and feet with our fingers. If the crab belly is hard, Portunus usually looks fresh. If it feels soft, it may be that the crab is too tender or too wet. The crab's feet are elastic when pinched, and can rebound when pressed, indicating that this kind of Portunus crab is full of crab meat. On the other hand, if you can't bounce back and feel empty, then nine times out of ten it is an empty shell crab, so it is not recommended to buy it.