Freshwater mussels are among the most endangered animals on Earth and their conservation has welfare dimensions beyond population metrics, as these long-lived animals may have nociceptive capacity.
Freshwater mussel welfare sits at a similar position to bivalve marine welfare — genuine uncertainty about sentience combined with enormous scale of mortality from anthropogenic causes. The conservation case for freshwater mussel protection is unambiguous: these animals provide irreplaceable ecosystem services and face extinction across much of their range. The welfare case adds the consideration that if these long-lived animals have any capacity for experience, the chronic degradation of their habitat and the acute stress of captive rearing programmes represent welfare-relevant harms to be minimised. Conservation efforts that address root causes — water quality, sediment, dam management, host fish recovery — are simultaneously the best conservation and welfare interventions. Head-starting welfare protocols that minimise handling stress and optimise water quality for reared animals reflect appropriate precautionary welfare consideration.