Farmed Halibut Welfare: Challenges in a Growing Aquaculture Sector

Atlantic halibut aquaculture is expanding, but these large flatfish present unique welfare challenges including slow growth, sensitivity to handling, and specific environmental requirements.

Key Facts

Atlantic halibut is among the largest flatfish — wild adults can exceed 200 kg
Farmed halibut have slow growth rates of 3-5 years to market size, increasing their lifetime exposure to farm conditions
Halibut are particularly sensitive to stress, poor water quality, and handling
They require cold, well-oxygenated water — warming temperatures pose increasing welfare risks
Crowding stress and social aggression are documented welfare challenges in intensive systems
Slaughter welfare for halibut is poorly standardised compared to salmon

Welfare Considerations

Halibut farming raises serious welfare concerns. Their long production cycle means fish experience farm conditions for years, amplifying the impact of any welfare deficiencies. Crowding induces stress responses and suppresses immune function. Handling during grading and health checks causes acute stress. Slaughter practices remain poorly regulated, and halibut may be killed by methods that do not ensure rapid loss of consciousness. As the sector grows, establishing evidence-based welfare standards specific to halibut biology is urgent.

What You Can Do

Ask retailers about welfare standards and sourcing practices for farmed halibut products
Support organisations advocating for fish welfare regulation in aquaculture
Choose products certified under schemes that include fish welfare auditing
Advocate for mandatory humane slaughter standards covering all farmed fish species
Support research into welfare indicators and stunning methods suitable for flatfish