The native white-clawed crayfish faces extinction in most UK waterways due to invasive signal crayfish carrying crayfish plague, requiring intensive conservation intervention.
White-clawed crayfish conservation sits at the intersection of conservation urgency and emerging welfare science. Crayfish research has documented nociceptive behavior and avoidance learning that suggests pain experience, and the UK Animal Welfare Act 2022 extended sentience recognition to decapod crustaceans including crayfish. This means that conservation interventions including trapping, translocation, and handling now have welfare dimensions that require consideration. The conservation case for intensive intervention is compelling - extinction of a native species is irreversible - but welfare-conscious handling protocols during translocation are appropriate given emerging sentience evidence. The larger welfare crisis is the suffering of individual crayfish dying from crayfish plague outbreak events.