Research into gilthead sea bream stocking density has identified welfare-optimal thresholds that balance production efficiency with behavioral welfare needs, providing evidence-based standards for certification.
Stocking density is the primary modifiable welfare determinant in sea bream aquaculture, with clear evidence that exceeding welfare-optimal thresholds leads to aggression, injury, immune suppression, and chronic stress. The gap between commercial practice and welfare-optimal density reflects the economic pressure to maximize production per unit volume, creating a structural conflict that welfare certification can help address through market incentives. Setting evidence-based density limits in certification standards provides the framework for industry-wide improvement when combined with consumer demand for certified products.