It is edible. Crabs are rich in nutrients and can be absorbed by cats after eating them. However, if you feed them in small amounts, they will not be digested and may cause vomiting, diarrhea and other symptoms. Any seafood food, including fish, must be cooked and fed to cats. Cats love to eat fishy and fresh food. If you don’t want to feed your cat seafood, remember to eat it secretly.