Crabs are caught in enormous numbers commercially and are increasingly recognized as potential welfare subjects requiring attention to killing methods and handling practices.
Crab welfare sits at a frontier where scientific evidence of sentience is advancing faster than regulatory adaptation. The behavioral and physiological evidence that crabs can experience something like pain — avoidance learning, wound-directed behavior, cortisol-equivalent stress hormones — is increasingly compelling, and the UK legal recognition of decapod sentience in 2021 reflects scientific consensus that is ahead of most food safety regulations. Live boiling, which remains the dominant killing method in professional and home cooking, exposes potentially sentient animals to extreme heat with no anesthesia. The Swiss approach — mandatory stunning before killing — and the availability of electrical stunning equipment for commercial use demonstrate that welfare-positive killing of crabs is technically feasible. The gap between what science suggests and current practice is large and closing slowly.