Farmed Eel Welfare: A Neglected Species

Eels are farmed in large quantities in Asia and Europe but receive almost no regulatory protection. Their complex biology and life cycle create serious welfare challenges in captivity.

Key Facts

European eel (Anguilla anguilla) is critically endangered; most farmed eels start as wild-caught glass eels because captive breeding has not been achieved at commercial scale.
Japan and China produce the majority of the world's farmed eel (unagi), which is a culturally significant food.
Eels can live 10-85 years in the wild; farmed eels are typically slaughtered at 18 months to 3 years.
Eels are sensitive to poor water quality, low dissolved oxygen, and high stocking density.
Common slaughter methods for eels include gutting while alive, which is widely considered inhumane.
Research indicates eels show pain responses consistent with sentience, though their capacity for suffering is debated.
High stocking densities in eel farms cause stress, reduced immune function, and increased disease.
The EU lists European eel as a species of concern but eel welfare in aquaculture is poorly regulated.

Welfare Considerations

Eel farming is one of the most welfare-challenged sectors of aquaculture. The reliance on wild-caught juveniles means the entire farming system depends on unsustainable harvesting of a critically endangered wild population, with significant mortality during capture and transport. On-farm conditions often include very high stocking densities, poor slaughter practices, and disease challenges. The inability to close the eel life cycle in captivity (eels require a complex oceanic migration to breed) means that sustainable eel farming is fundamentally unresolved. Welfare certification for eels is nascent, and consumer awareness of eel welfare issues is low despite high consumption in Japan, China, and parts of Europe.

What You Can Do

Reduce or eliminate consumption of eel products given both welfare and conservation concerns.
Ask sushi and Japanese restaurants about the sourcing and welfare standards of their eel.
Support research into eel reproduction and welfare-friendly farming methods.
Advocate for stronger regulation of eel capture and farming practices.
Support conservation initiatives to restore European eel populations and their migratory routes.
Choose aquaculture products from species with better welfare and sustainability profiles.