European and Japanese eels are farmed in significant quantities, yet their welfare receives almost no attention from researchers, regulators, or consumers. Their complex biology and declining wild populations make both welfare and sustainability concerns urgent.
Eel welfare sits at the intersection of sentience uncertainty, regulatory absence, and conservation crisis. As a fish species, eels are increasingly likely to be sentient based on neurological evidence, yet welfare standards for their farming remain essentially nonexistent. The industry's reliance on wild juvenile capture means that welfare concerns extend before aquaculture begins — glass eels subjected to intensive harvesting, handling, transport, and transfer to farm conditions face significant early mortality and stress. On farms, territorial aggression and cannibalism at high densities cause injury; water quality management in intensive systems is critical for welfare as for other fish. Slaughter welfare is a serious unaddressed issue: common methods cause prolonged suffering. The case for developing welfare standards for eels is strong and urgent, and the near-impossibility of captive breeding argues for exploring alternative protein sources rather than expanding an industry dependent on wild population depletion.