Grouper are highly prized fish in Asian markets and are farmed extensively in sea cages across Southeast Asia. Their territorial nature creates significant welfare challenges in cage production.
Grouper welfare in cage culture is compromised fundamentally by the mismatch between the species' territorial, solitary hunting ecology and the dense social conditions of cage production. Grouper are not schooling fish and maintain individual territories in nature. In cages, the inability to establish or defend territories results in persistent aggressive encounters causing physical injury. Dominant individuals monopolise feeding areas while subordinates receive inadequate nutrition. The reliance on wild-caught juveniles in some production systems adds capture and transport welfare costs. Disease pressure from Vibrio and viral pathogens requires repeated handling and treatment that adds to the chronic stress burden.