Farmed Eel Welfare: Challenges in a Controversial Aquaculture Sector

European eel farming raises intertwined conservation and welfare concerns, as the species requires wild-caught juveniles, faces population collapse, and endures welfare challenges in recirculating aquaculture systems.

Key Facts

European eels are critically endangered, having declined over 90% since the 1980s across their range
Farmed eels are raised from wild-caught glass eels (juveniles) since captive breeding has not been achieved commercially
Eels in recirculating aquaculture systems are maintained at high densities with restricted movement and natural behavior
Eels show stress responses to handling including elevated cortisol and behavioral changes
Japan is the world largest eel market, primarily consuming Japanese eel (Anguilla japonica) which faces similar decline
The IUCN and CITES have called for eel trade restrictions given population collapse and farming dependence on wild juveniles

Welfare Considerations

Eel welfare in aquaculture involves both direct welfare harms for farmed individuals and indirect welfare and conservation harms through dependence on wild-caught juveniles. Farmed eels in high-density recirculating systems cannot express their natural extensive ranging, migratory behavior, or varied foraging ecology. Eels are sensitive to water quality changes and handling, showing stress responses to routine farm procedures. Their slippery bodies make handling more physically traumatic than for many other fish species. The conservation emergency facing European and Japanese eel populations means that aquaculture demand directly removes juveniles from already critically depleted wild stocks — each farmed eel potentially represents a wild individual removed before contributing to natural reproduction. This combination of individual welfare compromise and population-level harm makes eel aquaculture ethically problematic in its current form.

What You Can Do

Avoid farmed European eel products given the conservation emergency facing wild populations
Reduce consumption of Japanese eel (unagi) which similarly depends on threatened wild populations
Support international action to restrict glass eel trade through CITES or equivalent mechanisms
Donate to European eel habitat restoration programs including removal of migration barriers
Raise awareness about eel population collapse as a lesser-known but severe aquatic conservation crisis
Support research into closed-cycle eel breeding that would eliminate dependence on wild-caught juveniles