To dream of a crab represents stubborn and determined aspects of your personality. You may possibly be too reliant on others and refuse to let go of a fruitless venture or dream. Crabs may also imply that you are feeling aggravated and frustrated.
Had a dream about a crabs underbelly that exposed eggs- ran to someone on the shore who was my teacher at the time and wanted to know if i can release them, would they live. He could not explain to me in English ( was Japanese ) so he had a female who could explain but she ate the roe.
Trying to kill a crab with a stone