 Yet claws are a large portion of a crab's biomass, ranging from 20% to over 50% of some species' total weight, and thus regeneration can be highly energy- and time-consuming.The empirical occurrence of regenerated claws in fishery harvests is low, with studies on stone crabs calculating from less than 10% (Davis et al., 1978), to 13% (Florida Fish and Wildlife Conservation Commission, 2011).Larger, older crabs generally do not survive long enough to regrow their claws, as they are near the end of their lifespan.