The freshwater pearl mussel is one of Britain's most endangered species and evidence for limited sentience in bivalves raises precautionary welfare considerations alongside conservation.
Freshwater pearl mussel welfare occupies the same uncertain territory as other bivalve welfare. Their decentralised nervous system and behavioural responses to environmental changes suggest they may have some form of welfare-relevant experience, though this is genuinely uncertain. Conservation of freshwater pearl mussels is urgent regardless of welfare status, but the welfare consideration adds an additional reason to minimise any interventions that could cause harm. Captive breeding for conservation, while involving some manipulation, is welfare-proportionate given the alternative of species extinction. The legal protection of remaining populations prevents the direct harm of pearl removal.