Crab yellow is unique to female crabs, and the kind that male crabs have is called crab paste. If you want to eat crab roe, you should buy a female crab, and the biggest difference between a male crab and a female crab lies in its navel. The navel of a male crab is pointed, and the belly is covered with a thin triangle, while the belly of a female crab is round, and the lid under the belly is much wider than that of a male crab. If you want to buy a female crab with more crab roe, you should choose a big one, because a big female crab grows for a long time, and the crab roe accumulated in the body is relatively rich. In addition, the back of a good crab with more crab yellow is blue and hard, and its abdomen is full and heavy.

Precautions for eating crabs:

1, can't eat dead crabs: crabs contain a lot of histidine. After death, bacteria multiply in crabs, which will make histidine form histamine, which is harmful to human body. Moreover, the longer the crab dies, the more histamine it contains in the body. If people eat dead crabs, they will be allergic or poisoned, so dead crabs must not be eaten.

2. Don't eat cooked crabs that have been kept for a long time: crabs can't eat dead, but if they are cooked crabs that have been kept for a long time, they can't eat them either. Because of the high content of protein in crabs, it is easy to rot and deteriorate, and it is easy to be contaminated by bacteria at room temperature. Therefore, crabs must be steamed and eaten now, and it is best not to eat crabs that have been stored for too long.

3, can not eat raw crabs: some people marinate crabs with salt, soak them in vinegar and wine, and it is easy to inhale the paragonimiasis in raw crabs. These parasites in the human body will cause people to cough, hemoptysis and other phenomena, and will also invade other organs such as the brain. Therefore, the bought crabs must be steamed before eating.

4. Don't eat with persimmons: Persimmons, strong tea and other foods contain relatively high tannic acid content. If eaten with crabs, the human body will have nausea, vomiting, diarrhea and abdominal pain.