1, sea crabs are different from river crabs. Sea crabs belong to salt water crabs, which usually die soon after being caught, so most of the frozen sea crabs we can eat are dead, and most of them are frozen dead sea crabs bought in supermarkets and aquatic products markets. Therefore, it is ok for sea crabs to die, but eat them while they are fresh, and don't leave them for too long.

When we say we can't eat dead crabs, we mean dead river crabs. The difference between river crabs and sea crabs is that the harsh environment in which they live is dirty. All crabs in the rivers and lakes are river crabs. They mainly feed on animal carcasses and plankton, as well as many bacteria and toxins. After death, these harmful substances will quickly invade crab meat. The longer the death time, the more harmful substances. So dead river crabs can't be eaten. we

Extended data:

Nutritional value of crabs

Crab is a high protein food. According to the fresh weight, the protein content in 100g crab meat is about 15% to 18%. It seems that this value is not as high as 20% of chicken and beef, but it is not the case in detail. Because the moisture content of crab meat is particularly high and the fat content is particularly low, if calculated by dry weight, its protein content is considerable, accounting for 70% to 90% of the dry weight.

2, rich in trace elements and vitamins: crab meat is rich in magnesium and high in calcium. For example, the content of calcium in river crabs exceeds that in milk, and some varieties can reach more than 200 mg/ 100 g. In addition, the content of trace elements such as zinc, selenium and iodine in crabs is also quite high, especially selenium, which is far higher than the level of ordinary meat.

3. The cholesterol content in crab meat is higher than that in meat, which is close to the level of animal viscera such as liver. The cholesterol content of crab yolk is higher than that of crab meat. Although people are always very worried about cholesterol when eating eggs, there are few such worries when eating crabs. Almost no one is willing to give up the delicious crab roe, perhaps because the current food is fearless.

References:

People's Network-What is the nutritional value of crabs? Three points for attention in eating crabs