Turbot Aquaculture Welfare: Flat Fish in Tanks

Turbot are farmed in land-based tank systems across Europe. Their welfare in aquaculture involves specific challenges related to their flatfish body form and the intensive production systems used.

Key Facts

Turbot is a high-value flatfish farmed in Spain, Portugal, France, and China in recirculating aquaculture systems
Their flat body and bottom-orientation make turbot unusual among farmed fish in their use of tank floor space
High stocking densities in turbot tanks cause competition, skin damage, and stress
Water quality management is critical in intensive turbot systems — ammonia and CO2 build-up impair welfare
Turbot growth rates and feed conversion are well optimised in modern aquaculture systems

Welfare Considerations

Turbot welfare in intensive land-based tanks involves the same chronic stressors as other intensive fish farming: high stocking density, competition for space, water quality challenges, and handling stress at grading and harvest. Their flatfish lifestyle means welfare metrics must account for floor space availability rather than just water volume. Skin lesions from contact with tank surfaces and other individuals are a key welfare indicator. The premium price of turbot creates economic capacity for welfare improvements that need not compromise profitability.

What You Can Do

Choose turbot from farms with documented low stocking densities and water quality monitoring
Support aquaculture certification schemes that include flatfish-specific welfare criteria
Engage with researchers developing turbot-specific welfare assessment frameworks
Back regulations that set minimum space and water quality standards for intensive turbot aquaculture