Farmed Turbot Welfare in Aquaculture

Turbot are high-value flatfish farmed in recirculating aquaculture systems — their welfare needs differ significantly from round fish and require specific management approaches.

Key Facts

Turbot (Scophthalmus maximus) are flatfish that rest on tank bottoms — tank floor area rather than volume determines stocking density welfare.
Turbot are territorial and show aggressive fin-biting behaviour at high densities, causing injuries and secondary infections.
As bottom-dwelling fish, turbot are poorly served by typical round tank designs — flat-bottomed, low-sided tanks better match their body plan.
Turbot respond to light, current, and substrate in ways that reflect habitat preference — environmental enrichment affects behaviour and welfare.
Harvesting turbot typically involves crowding and ice slurry — percussion stunning before killing is available but not standard practice.

Welfare Considerations

Turbot welfare illustrates how species-specific biology must inform aquaculture design. Round tanks designed for salmonids are poorly suited to a bottom-dwelling flatfish that requires maximal floor area and minimal competition. High-density turbot show predictable welfare-compromising aggression and injury. The welfare improvements for turbot farming are relatively straightforward: appropriate flat tank design, stocking density limits that prevent aggression, and humane harvest methods. The barrier is economic investment rather than technical innovation.

What You Can Do

Support turbot aquaculture certification schemes that include species-specific stocking density and tank design standards.
Choose turbot products from certified operations with documented welfare management protocols.
Advocate for inclusion of flatfish-specific requirements in aquaculture welfare regulations.
Reduce consumption of uncertified turbot products from systems where welfare management is undocumented.