Crabs are caught or farmed in enormous numbers globally; growing scientific evidence for their capacity to experience pain demands improved welfare standards across the industry.
Crabs present a paradigm case for the expanding circle of animal welfare concern. Until recently dismissed as simple reflex machines, accumulating evidence — avoidance learning, wound guarding, trade-off decisions suggesting pain motivation — strongly supports their sentience. The boiling of live crabs causes prolonged struggling and tail-flipping responses consistent with pain experience lasting several minutes before death. Humane killing using prior electrical or percussive stunning dramatically reduces potential suffering. The fishing industry has been slow to adopt these methods due to cost and unfamiliarity, but regulatory change in the UK and Switzerland is driving reform.