Crabs are among the most commercially harvested invertebrates globally, but their welfare during capture, transport, and processing receives minimal attention despite growing evidence of pain capacity.
Crab welfare sits at the emerging frontier of invertebrate welfare science. The neural architecture of crabs is genuinely different from vertebrates, creating legitimate scientific uncertainty about pain experience. But the behavioral evidence — avoidance learning, wound protection, analgesic-modulated responses — crosses the threshold that the precautionary principle applies. The scale of harvest ensures that even a small probability of pain experience involves enormous total suffering. Pre-stunning methods are available and used in some contexts. The barrier to broader adoption is commercial inertia and the absence of the cultural norm that crabs require humane treatment before killing.