10 minutes. Generally, the time for steaming crabs with cat claws is about 10 minute. The scientific name of cat claw crab is river crab, also known as "crab" and "hairy crab". The head and breastplate formed by the combination of head and chest are square, hard in texture, rich in high-quality protein and less in fat and carbohydrate. Crab yolk has a high cholesterol content, so try again.