Crayfish aquaculture is growing globally as a food source. Their increasing recognition as sentient animals capable of pain raises important welfare questions for farming and processing practices.
Crayfish welfare sits at the intersection of emerging sentience science and established aquaculture practice. The evidence for crayfish sentience includes complex behavioral responses to noxious stimuli, avoidance learning, and production of opioid-like compounds — sufficient to support the conclusion that crayfish likely experience pain and stress. Standard commercial practice — boiling live crayfish — is now prohibited in UK food processing without prior stunning. The welfare implications for the billions of crayfish produced annually globally are significant: modest improvements in handling and slaughter welfare would affect enormous numbers of animals. The challenge is developing practical, commercially viable stunning methods that scale to the throughput required for commercial crayfish processing. Welfare improvements in this sector require simultaneous advancement in stun technology and regulatory frameworks requiring their use.