Farmed Turbot Welfare in European Aquaculture

Turbot is a high-value flatfish farmed in land-based tank systems across Europe. Despite its premium price, welfare standards are only beginning to be systematically addressed.

Key Facts

Turbot (Scophthalmus maximus) farming is concentrated in Spain, France, Portugal, and China
Land-based RAS (Recirculating Aquaculture Systems) are standard for turbot production
Turbot are naturally benthic (bottom-dwelling) fish requiring specific substrate and depth conditions
They are highly susceptible to handling stress and show strong avoidance responses
Crowding in tanks causes fin damage, aggression, and elevated stress hormone levels
Slaughter typically involves live chilling or CO2 narcosis — both cause stress before unconsciousness

Welfare Considerations

Turbot welfare in RAS systems depends on providing appropriate conditions for a benthic species — sandy or gravel substrate, appropriate tank depth, controlled water temperature, and low stocking densities. Research shows turbot in high-density tanks show significantly elevated cortisol and reduced feeding motivation. Their benthic lifestyle means they are poorly served by systems designed for water-column species like salmon. Percussion stunning before slaughter is the most humane method but requires species-specific equipment calibration for this unusual flat-bodied fish.

What You Can Do

Choose turbot from producers certified under GlobalG.A.P. or emerging aquaculture welfare standards
Support research into turbot-specific welfare requirements and appropriate slaughter standards
Advocate for welfare assessment requirements in European aquaculture subsidy programs
Ask seafood retailers about welfare credentials of their turbot supply chains