Gilthead sea bream is one of the most farmed fish in the Mediterranean. Welfare science for this species is advancing, with clear evidence on stocking density limits, handling stress, and the need for improved slaughter standards.
Gilthead sea bream welfare in Mediterranean aquaculture shares many characteristics with other net-pen farmed fish — crowding stress, handling trauma during grading and harvest, disease from parasites, and welfare-poor slaughter practices. Crowding above optimal density suppresses immune function and increases parasite susceptibility, particularly gill fluke infections that cause chronic respiratory difficulty. Welfare-conscious operators maintain lower densities and use approved treatments to manage parasite burdens humanely. The most significant acute welfare issue is slaughter — ice slurry without prior stunning allows several minutes of consciousness during asphyxiation in chilled water. Electrical stunning prior to ice slurry is feasible for sea bream and represents the most impactful single welfare improvement available. EU aquaculture welfare proposals include sea bream-specific provisions. Consumer preference for welfare-certified Mediterranean fish creates market pressure for improvement.