Wild European Eel Welfare and Conservation

European eels are critically endangered, having declined by over 90% since the 1980s. Their complex lifecycle, spanning freshwater and marine environments, creates multiple welfare challenges and conservation opportunities.

Key Facts

European eels (Anguilla anguilla) are critically endangered on the IUCN Red List following catastrophic population decline
Their lifecycle involves spawning in the Sargasso Sea, larval drift across the Atlantic, estuarine juvenile stages, freshwater adult growth, and return migration to breed
Migration is blocked by thousands of weirs, dams, and water control structures across European river systems
Eels attempting to migrate past barriers face injuries from turbines, exhaustion, and predation
Parasitic infestation by the introduced swim bladder nematode Anguillicoloides crassus reduces swimming capacity and breeding success
Commercial fishing pressure has reduced eel populations throughout their range
Eel passes - bypass channels or ladders - allow upstream migration at some barriers but their effectiveness is variable
EU eel management regulations require member states to allow 40% escapement of silver eels for breeding

Welfare Considerations

European eel welfare is primarily shaped by the multiple barriers they encounter during their extraordinary lifecycle. Physical barriers cause direct welfare harm - eels injured passing through turbines, exhausted attempting to pass insurmountable weirs, or killed by predators while congregating below barriers. The parasitic swim bladder worm causes chronic physiological impairment of gas exchange, reducing the capacity for the deep migration necessary for breeding. Commercial fishing pressure on both yellow (freshwater) and glass (recruiting) eels removes individuals from populations already struggling to maintain viability. The welfare of individual eels is inseparable from the health of the overall population trajectory - a species in catastrophic decline cannot provide good welfare conditions for its members.

What You Can Do

Support the RSPB, Rivers Trust, and Eel Aid in eel conservation and river barrier removal
Advocate for eel pass installation at river barriers without adequate upstream migration routes
Engage with Environment Agency and Water Framework Directive implementation to prioritise barrier removal
Avoid eating European eel - stocks are critically endangered and fishing adds to population pressure
Support catchment-wide water quality improvement that benefits eel habitat throughout their freshwater phase
Participate in eel monitoring surveys run by the Environment Agency and local river trusts