Atlantic cod aquaculture has been attempted for decades but faces persistent welfare challenges — particularly cannibalism in early life stages and disease susceptibility in intensive systems. Farmed cod remains a niche product.
Atlantic cod welfare in aquaculture is affected by the species' naturally aggressive and cannibalistic tendencies. Grading — sorting fish by size to prevent large fish eating smaller ones — is a frequent welfare stress event but prevents the greater welfare harm of cannibalism. Cod crowded at high density show elevated cortisol, fin erosion and reduced immune function. Disease management through vaccination has improved welfare by reducing antibiotic use — vaccinated fish have fewer bacterial disease episodes. The small scale of cod aquaculture globally means welfare standards are inconsistently applied. Research into cod welfare indicators has lagged behind salmon science, making assessment of population-level welfare difficult.