Aquaculture Halibut Welfare | Animal Welfare Hub

Atlantic and Pacific halibut are increasingly farmed flatfish with specific welfare needs related to their unique biology and intensive production challenges.

Key Facts

Halibut are large flatfish that are bottom-dwellers in the wild — their resting behavior requires appropriate tank substrate
Atlantic halibut aquaculture faces chronic low reproductive performance — broodstock welfare affects hatchery success
High stocking densities in halibut tanks cause fin damage, stress-related skin lesions, and competition injuries
Halibut have complex light requirements — light intensity and photoperiod affect growth, stress, and behavior
They are susceptible to bacterial kidney disease and viral nervous necrosis — disease management affects welfare
Pacific halibut wild-catch remains more common than farming, with its own welfare considerations at capture

Welfare Considerations

Halibut welfare in aquaculture addresses species-specific needs that differ substantially from the better-studied salmonid systems. As flatfish, halibut evolved resting on substrate — tank systems that force them to compete for bottom space create welfare challenges that surface-oriented fish species do not face. Appropriate tank design with substrate or slope accommodation reduces competition stress. Light management is particularly important for halibut: inappropriate photoperiod causes welfare-relevant behavioral abnormalities and reproductive dysfunction in broodstock. Disease management requires careful attention to welfare-humane treatment protocols. As halibut farming expands commercially, developing welfare standards specific to their needs — rather than applying salmonid standards inappropriately — is a priority for the aquaculture welfare science community.

What You Can Do

Support aquaculture welfare standards that include flatfish-specific welfare criteria for halibut production
Ask seafood retailers about welfare standards for farmed halibut products in their supply chains
Advocate for light management and tank design requirements specific to flatfish in aquaculture welfare standards
Support research into optimal halibut husbandry conditions that minimize stress and disease
Consider welfare implications of both farmed and wild-caught halibut when making seafood choices
Engage with aquaculture welfare organizations developing welfare frameworks for diverse farmed fish species