1, if it is dead for about two to three hours the river crab has been inedible.

2, and once the river crab left the suitable living environment, is very easy to die, if you eat the dead river crab, very likely because the protein in the crab meat is decomposed into cadaverine and histamine, affecting human health, so if you want to eat river crabs, be sure to buy just dead river crabs, and be sure to deal with the clean, cooking can be eaten if cooked.