Eel Welfare: A Neglected Crisis in Aquaculture

European and Japanese eels are critically endangered and among the most welfare-neglected fish species, with aquaculture practices raising significant concerns and wild populations under severe pressure.

Key Facts

The European eel is listed as Critically Endangered — populations have declined by over 90% since the 1980s
Eel aquaculture relies almost entirely on wild-caught glass eels as seed stock, placing direct pressure on depleted wild populations
Eels can migrate thousands of kilometres to spawn in the Sargasso Sea — their welfare during confinement reflects this extreme ranging capacity
Slaughter methods for eels are poorly standardised — gutting while alive, salt baths, and other inadequate methods remain common
The eel's extreme resilience — surviving being cut in pieces — has been used to argue against welfare concern, despite clear nociception evidence
Japanese unagi aquaculture consumes enormous quantities of wild-caught juveniles, threatening that species' survival
Research into eel pain and sentience is limited but their neurological structure is consistent with capacity for pain experience

Welfare Considerations

Eel welfare is doubly neglected — by aquaculture welfare frameworks that have prioritised salmon and trout, and by conservation programmes that focus on population recovery without addressing the welfare of individual eels. The fishing and processing of eels involves practices considered grossly inadequate for any other commercially important vertebrate — methods that prolong death and cause significant suffering for extended periods. The conservation crisis simultaneously makes welfare reform complex: wild eel populations cannot sustain harvesting for seed stock indefinitely, making the entire aquaculture sector trajectory uncertain. In the near term, humane slaughter standards and reduced harvesting pressure represent the most achievable welfare improvements.

What You Can Do

Avoid consuming eel products sourced from critically endangered wild populations
Advocate for humane slaughter standards for eels — the current absence of standardised protocols is a welfare failure
Support habitat restoration and barrier removal programmes that enable eel migration and population recovery
Consult sustainable seafood guides regarding eel conservation status before purchasing
Support research into closed-cycle eel aquaculture that would eliminate reliance on wild-caught juveniles
Raise awareness of eel welfare and conservation among consumers — these species are poorly understood despite their culinary prominence