The freshwater pearl mussel is one of Britain's most critically endangered species, and its conservation raises questions about the welfare of molluscs and restoration ethics.
Freshwater pearl mussels sit at the frontier of welfare consideration. While the scientific evidence for mollusc sentience is weaker than for vertebrates, the complexity of their biology and their extraordinary longevity give reason for careful thought. Conservation programmes involving captive rearing and translocation should apply basic precautionary welfare principles - handling gently, minimising desiccation exposure, and replicating natural water conditions as closely as possible. The broader welfare argument for freshwater mussel conservation is indirect but powerful: healthy freshwater mussel populations indicate clean rivers that support diverse communities of fish, invertebrates, and other animals - a high-welfare freshwater ecosystem.