Stocking density management in Atlantic salmon farms has direct welfare implications through its effects on stress levels, aggression, disease susceptibility and behavioral expression.
Stocking density represents one of the most influential management variables for salmon welfare, with dose-response relationships between density and multiple welfare indicators well-established in the literature. The commercial pressure to maximize production per unit volume creates incentives to approach or exceed welfare-appropriate density limits. Welfare certifications that specify density limits below legal maximums create a market mechanism for driving density reductions beyond regulatory requirements. The welfare case for lower stocking densities is strong and consistent — fish at lower densities show lower stress hormones, less aggressive behavior, better fin condition and greater behavioral diversity. The challenge is making the welfare premium economically viable through consumer willingness to pay for certified products.