Farmed Eel Welfare: An Understudied Species with Unique Challenges

European and Japanese eels are farmed at large scale but start life as wild-caught juveniles. Their welfare raises questions about capture stress, farming conditions, and slaughter.

Key Facts

European eel (Anguilla anguilla) cannot be bred in captivity — farming depends entirely on wild-caught glass eels
Glass eel capture from wild populations raises conservation and welfare concerns simultaneously
Eels are carnivorous and can be aggressive when crowded — injuries from fin-biting are common in dense systems
They are long-lived — farmed eels may spend 3-10 years in farming systems before harvest
Slaughter methods for eels including salting, gutting alive, and CO2 immersion are poorly standardised
Research on eel sentience and pain response indicates capacity for nociception

Welfare Considerations

Eel farming raises welfare concerns across the production cycle. Capture of wild glass eels involves handling stress at a vulnerable developmental stage. Long grow-out periods in intensive systems expose eels to chronic crowding and associated welfare deficits. Slaughter practices are among the least welfare-conscious of any farmed species — methods that would be unacceptable for other vertebrates are routine in the eel industry. The conservation crisis facing wild eel populations adds urgency to developing more sustainable and welfare-conscious production systems, including investment in breeding research to reduce dependence on wild capture.

What You Can Do

Be aware that most farmed eels start life as wild-caught juveniles from endangered wild populations
Ask retailers about the welfare and conservation credentials of farmed eel products
Support research into captive eel breeding — success would simultaneously improve welfare and conservation
Advocate for welfare standards for eel slaughter equivalent to those for other farmed fish
Reduce consumption of eel products until more sustainable and welfare-conscious alternatives are developed