Crayfish are farmed in growing numbers for food, with emerging scientific evidence for their capacity to experience pain and stress raising welfare questions that the industry is only beginning to address.
Crayfish welfare occupies similar scientific territory to shrimp welfare — meaningful uncertainty about sentience combined with rapidly growing production scale. Crayfish show more complex behaviour than many invertebrates: they learn from aversive experiences, show individual differences in boldness, and exhibit stress responses to noxious stimuli. Whether this constitutes conscious suffering remains debated. The precautionary argument favours minimising potential suffering through improved killing methods and transport conditions, given the large numbers involved. Rapid chilling before killing may reduce potential distress, though research specifically on crayfish is limited. As freshwater aquaculture expands, establishing welfare baselines now prevents future entrenchment of practices later found to cause unnecessary suffering.