Atlantic halibut aquaculture faces specific welfare challenges related to the species size, benthic lifestyle, and developmental characteristics. Understanding these informs better welfare standards.
Halibut aquaculture presents welfare challenges distinctive to this species unique biology. As bottom-dwelling fish, halibut require tank designs that provide adequate floor area rather than simply volumetric space; overcrowding that is acceptable in volumetric terms may still prevent normal benthic resting behaviour. Juvenile halibut welfare during metamorphosis is particularly sensitive; inappropriate light conditions and nutritional deficiencies during this phase cause developmental abnormalities with long-term welfare implications. Cannibalism among juveniles represents acute welfare harm that routine size grading can substantially reduce. The slow growth rate of halibut means that welfare conditions are maintained for years per animal, amplifying the cumulative effect of even low-level chronic stress. Species-specific welfare research and standards for halibut are substantially less developed than for salmon.