OK, just read a little about the subject:
Both claws of a stone crab may be harvested lawfully if they are both of legal size. Although it is currently lawful to harvest both of a stone crab's claws, usually only one claw is taken from an individual stone crab during harvest for conservation purposes. The practice of removing both claws of a stone crab threatens the ability of the resource to renew itself. Stone crab claws are a renewable resource because only the claw may be harvested and the crab is left to regenerate a new claw. Should both claws be of lawful harvest size and removed, the crab would be left with little means of defense and no mode of acquiring food. This drastically reduces its chance for survival and re-growth of a new claw is highly compromised without a proper nutrient supply.