Freshwater mussels are among the most imperiled animals on Earth, with complex life histories and an uncertain welfare status that makes their conservation both urgent and ethically interesting.
Freshwater mussels occupy an interesting welfare-adjacent space: the evidence for their sentience is weak compared to fish and invertebrates with more developed nervous systems, but the uncertainty warrants careful consideration. More importantly, mussels represent a group where conservation and ecosystem welfare are deeply intertwined — mussel decline degrades water quality in ways that harm billions of other organisms. Captive propagation programs for endangered mussel species create unique challenges in managing obligate fish hosts alongside the mussels themselves, requiring integrated multi-species welfare planning.