1. Bread crabs are edible when they are dead. Bread crab is a kind of sea crab, which is different from river crab. Sea crabs usually die soon after being caught. So most of the bread crabs or sea crabs we eat are dead. As long as it is preserved, there is generally no problem. The bread crabs we bought are all frozen and safe to eat, but if you smell a strange smell, don't eat them, because crabs are high in protein after all.

2. The crab we usually eat can't die naturally, because it is a highly immune creature. Once on the verge of death or already dead, toxins and bacteria will invade the body of river crabs, producing harmful substances, which will be poisoned when absorbed by our bodies, so dead river crabs cannot be eaten. But because sea crabs are special, they can still be eaten as long as they are preserved, and most of what we can eat at ordinary times is dead.