Crabs farmed and caught commercially face welfare concerns around live boiling and other slaughter methods — particularly in light of evidence supporting decapod crustacean sentience recognized by UK legislation.
If crabs are sentient — as the scientific evidence increasingly suggests — then live boiling represents minutes of potential distress in a conscious animal before death. This is the same welfare problem as noted for lobsters. The evidence base for crab sentience is now sufficiently strong that several European countries recommend against live boiling and Switzerland has banned the practice. Electrical stunning, if properly calibrated for the species, offers a more humane alternative that renders the animal insensible before killing. The scale of crab consumption — billions of crabs caught and processed annually — means that even small per-capita welfare improvements aggregate to very large total welfare benefit. Consumer-facing guidance about more humane crab preparation methods is a practical welfare intervention.