Freshwater pearl mussels are among Britain's most endangered species, living over 100 years but requiring pristine water conditions that modern agriculture and development rarely allows.
The welfare significance of freshwater pearl mussel decline operates primarily at ecosystem and species level - individual mussel sentience is uncertain but their role as long-lived ecosystem engineers in clean river systems is profound. The loss of pearl mussel populations reflects and amplifies poor freshwater conditions that harm welfare-relevant fish, invertebrates, and waterbirds throughout river catchments. Restoration of pearl mussel habitat through reducing agricultural runoff and restoring river margins improves conditions for entire aquatic communities. The species' extreme longevity means each individual's death represents decades of potential ecological contribution lost.