2. In fact, the poison hidden by dead river crabs is far more than that. Crabs also contain more histidine, which is easily decomposed and can produce histamine and histamine-like substances under the action of decarboxylase. Especially when crabs die, histidine decomposes faster. The longer the crab dies, the more histamine accumulates in the body. When histamine accumulates to a certain amount, it will cause poisoning if eaten.
3. Among all toxins, there is a very important part-ammonia. How can a river crab carry ammonia? This needs to start with its rich protein. Crabs contain a lot of protein. After its death, protein in the body will be decomposed into ammonia. After the dead crab is eaten into the human body, the excess ammonia must be discharged through the human body, which will do harm to health.
Extended data:
Method for selecting live crabs
1. When picking, you can gently press the shell surface near the crab's eyes with your fingers. If the crab's eyes move immediately, it means that it is full of vitality. You can also put your finger between the claws of the crab. If the crab's claws are strong, it means that the crab has strong vitality. What's more, the crabs that come out of the water spit out bubbles, which are live crabs and can be purchased with confidence.
Crabs can easily distinguish between males and females. We turn the crab upside down, with a triangular belly for the male and a round belly for the female.
3. But an expert can tell from her legs that the female crab has a gray-black fluff on her paws, which is not found anywhere else. The male has fine hairs arranged like brushes on his eight legs.
People's Network-Health What You Need to Know: Can Crabs Eat After Death?