White-clawed crayfish are the UK's only native crayfish species and are critically threatened by invasive signal crayfish and crayfish plague. Management responses raise welfare questions for both species.
Crayfish welfare sits at the intersection of uncertain invertebrate sentience and conservation necessity. The evidence for crayfish nociception and stress responses suggests they warrant some moral consideration under the precautionary principle, even if the depth of their subjective experience remains uncertain. Conservation management that traps invasive signal crayfish to protect native populations must weigh this precautionary welfare concern against the conservation imperative of protecting a critically endangered native species. Best practice in crayfish handling - rapid, stress-minimizing procedures for both native translocations and invasive species control - reflects appropriate moral consideration under uncertainty.