First of all, considering the taste, hairy crabs lose their original flavor after they die. There is also a histidine substance in hairy crabs, which is easily decomposed and can produce histamine and histamine-like substances under the action of decarboxylase. After the hairy crabs die, the midgut glands will soon fall apart, and the histidine and digestive enzymes inside will break down the hairy crabs. Therefore, the dead hairy crabs taste strange and the taste is greatly reduced.
Secondly, the hairy crab itself is non-toxic, but after the hairy crab dies and its shell is damaged, protein in the hairy crab will breed bacteria, and the infected bacteria in it will multiply in large numbers, and the bacteria may produce toxins. Dead hairy crabs may be poisonous.
Thirdly, the body of hairy crabs is easy to carry heavy metals. After the hairy crabs die, the midgut glands will quickly fall apart, and the digestive enzymes scattered inside will decompose the hairy crabs. The intestinal glands are relatively easy to enrich heavy metals, and heavy metals will also come out to produce pollution after they rot.
Although it is a dead hairy crab, the protein and fat it contains will become nutrients for bacteria, leading to a large number of bacteria breeding, and at the same time, it will decompose protein into cadaverine and histamine, which are toxic and can lead to poisoning, and histamine will lead to allergies, such as numbness of limbs, skin allergy, general weakness, and even allergic phenomena such as asthma and dyspnea.
To identify a dead crab, you have to look at it, smell it and pinch it.
1, look at the color, the color of the dead crab is dim.
Fresh crabs are bright red in the back and white in the abdomen after being cooked, while dead crabs are dark red in the back and gray in the abdomen.
2. Dead crabs have a rotten taste
Live crabs taste fresh seafood when cooked. If you think crabs are smelly, it should be the inherent fishy smell of seafood. If you get used to them, you won't feel smelly. However, dead crabs will have a particularly pungent smell when their meat is rotten, which is different from the rotten smell of food.
3. Dead crabs are soft when cooked.
The shell of a live crab is hard after being cooked, and it will not sag when pressed by hand, while the shell of a dead crab is soft because it has begun to rot, so it will be pressed down when pressed lightly by hand. .