Welfare of Farmed Atlantic Halibut Under Intensive Aquaculture

Atlantic halibut aquaculture is growing in Norway and Scotland, with welfare challenges including territorial aggression, light sensitivity, and skeletal deformities.

Key Facts

Atlantic halibut are the largest flatfish in the North Atlantic, with wild individuals reaching 300 kg
Farmed halibut show high rates of aggressive cannibalism when stocked at commercial densities
Halibut are photosensitive during juvenile stages — incorrect light management causes eye damage and immune suppression
Spinal deformities occur in 15-30% of intensively farmed halibut populations due to rapid growth selection
Halibut welfare science is significantly less advanced than for Atlantic salmon despite growing production volumes

Welfare Considerations

Atlantic halibut farming is an emerging industry where welfare science lags significantly behind production growth. The species presents challenges — aggressive territorial behavior, extreme sensitivity to light conditions in juvenile stages, high deformity rates — that have not yet been adequately addressed through husbandry innovation. Learning from the salmon welfare experience means building welfare monitoring into halibut farming systems from the start, rather than addressing welfare problems after they have become normalized production failures.

What You Can Do

Choose Atlantic halibut from certified welfare-conscious aquaculture operations
Support development of halibut-specific welfare standards and assessment tools
Advocate for welfare monitoring to be built into halibut aquaculture licensing from the outset
Ask seafood suppliers about the welfare standards of their halibut sourcing