Farmed Eel Welfare: A Neglected Aquaculture Crisis

European and Japanese eels are among the world's most consumed fish, yet their farming involves intense welfare compromises and is built on wild-caught juvenile eels from populations already in severe decline.

Key Facts

European eel (Anguilla anguilla) is listed as critically endangered by the IUCN — populations have declined by over 90% since the 1970s
Eel farming cannot yet use hatchery-bred eels; all farmed eels start as wild-caught glass eels (juvenile stage)
Japan consumes approximately 70% of global eel production, primarily Japanese eel (Anguilla japonica)
Eels are typically farmed in recirculating aquaculture systems (RAS) at very high densities
Eel skin and slime provide some protection against abrasion, but crowding still causes fin erosion and disease
Eels are highly sensitive to handling stress — blood cortisol spikes dramatically and recovers slowly
Slaughter welfare is often poor — many eels are killed by ice slurry (a slow process) or decapitation without prior stunning
Eels show learning ability, pain avoidance, and complex behaviours indicating sentience

Welfare Considerations

Eel welfare is doubly compromised: the wild harvest of glass eels depletes already critically endangered wild populations, and the farming conditions for those eels are often poor. High stocking densities in recirculating systems cause chronic stress and disease. Eels are particularly sensitive to handling; capture and transport induce intense physiological stress responses. The inability to breed eels in captivity at commercial scale creates a fundamental sustainability problem that also has welfare dimensions — wild glass eels experience stress during capture, handling, and transport to farms. Slaughter welfare receives little attention in eel processing, with most eels not stunned before killing. Consumer demand, particularly in Japan and East Asia, drives a system with serious welfare and conservation consequences.

What You Can Do

Avoid consuming eel products — this is the single most effective action for both welfare and conservation
If you do eat eel, seek out suppliers with third-party welfare certification
Support research into closing the eel life cycle in captivity to remove pressure on wild populations
Advocate for improved slaughter welfare standards requiring pre-stunning in eel processing
Raise awareness of eel conservation status — many consumers are unaware eels are critically endangered
Support river restoration projects that improve wild eel habitat and population recovery