Whitefish species—including Atlantic cod, haddock, pollock, and halibut—are targets for aquaculture development as wild stock pressure increases. Their welfare needs differ substantially from salmonids and require species-specific research and management approaches.
Whitefish are demersal, relatively cold-water species with different social structures, feeding behaviours, and stress responses compared to salmonids. Cod form loose schools; halibut are largely solitary. Most whitefish species mature earlier than Atlantic salmon—creating production challenges from premature maturation. Their sensitivity to water temperature changes, handling stress, and social disruption requires management protocols adapted to each species' specific biology.
Shared welfare challenges across whitefish aquaculture include: premature sexual maturation diverting energy from growth; aggressive behaviour in congested production environments; disease susceptibility from combined stress and high stocking density; inadequate slaughter welfare in many facilities; and limited species-specific welfare research compared to salmonids. Addressing these shared challenges through species-appropriate research and management would deliver substantial welfare improvements.
All whitefish species require cold, well-oxygenated water. Temperature management is critical—most species have thermal optima for welfare and growth between 8-14°C. Suboptimal temperature chronically stresses fish, increasing disease susceptibility and reducing welfare. Modern RAS systems for whitefish provide consistent temperature and water quality, though the biological complexity of managing multiple water quality parameters simultaneously requires robust monitoring and response protocols.
As whitefish aquaculture develops, incorporating welfare science into system design from the outset—rather than retrofitting welfare improvements to established production practices—offers the most welfare-positive pathway. Species-specific stocking density recommendations, welfare-positive slaughter requirements in certification, and investment in whitefish pain and stress research will accelerate welfare improvement across this emerging sector.