Gilthead sea bream is the most farmed marine fish in the Mediterranean, with welfare challenges specific to this species including aggressive hierarchies, fin erosion, and reproductive welfare.
Gilthead sea bream welfare reflects the welfare challenges of a semi-pelagic Mediterranean species held in intensive cage systems. Natural social hierarchies become damaging in crowded conditions where subordinate fish cannot escape dominant individuals. Fin erosion from aggression is both a welfare indicator and a welfare problem — damaged fins impair swimming and increase infection risk. Photoperiod manipulation for spawning control disrupts natural reproductive cycles in ways that may affect welfare. Mediterranean aquaculture welfare standards lag significantly behind northern European standards for salmonids.