 Due to the time it takes for a crab to regrow lost limbs, however, whether or not the practice represents truly sustainable fishing is still a point of scientific inquiry, and the ethics of declawing are also subject to debates over pain in crustaceans.While not always fatal, declawing can substantially alter the chances of a crab's survival in the wild.Declawing is a controversial practice; some jurisdictions have banned it partially or completely, while others only allow the crab's claws to be harvested commercially.