Aquatic Animals

Wild Freshwater Crayfish and Invasive Species Welfare

Non-native crayfish species are displacing native crayfish from European waterways, raising welfare questions for both native and invasive populations.

Key Facts

American signal crayfish have displaced native European crayfish through disease and competition
Invasive crayfish carry crayfish plague that kills native species
Management programs target invasive populations through trapping and removal
Native European crayfish populations have declined by over 90% in many countries

Welfare Considerations

Both displacement of native species and management targeting of invasive species involve welfare considerations. Native crayfish dying from plague experience genuine suffering. Invasive crayfish subjected to removal programs also experience capture stress. The welfare of both is relevant even within a management context.

What You Can Do

Never release aquarium crayfish into natural waterways
Support native crayfish conservation and disease-free refuge programs
Follow invasive species management guidelines for waterways you use
Advocate for stricter regulation of crayfish trade to prevent new introductions