 Effects on mating appear to vary by species; studies on the green crab and the velvet crab demonstrate that the loss of limbs impair mating chances, but evidence of such an effect among the Atlantic blue crab is mixed.Whether or not crustaceans are capable of feeling pain is a topic of ongoing scientific discussion and debate.It has been argued that because crabs can autotomize their claws, manual declawing along natural fracture planes might not cause pain.