Intensive recirculating aquaculture systems for barramundi offer welfare advantages when properly managed but require careful attention to species-specific stress responses and water quality.
Barramundi welfare in intensive RAS environments depends on maintaining the water quality parameters that this warm-water species requires while managing the behavioral challenges that arise from high-density group housing. The aggressive territorial tendencies of barramundi in inadequate space create chronic agonistic interactions that stress subordinate individuals and cause fin damage and growth suppression. Adequate stocking density management, feed delivery systems that prevent monopolization by dominant fish, and water quality monitoring with automated alerts provide the foundation of welfare-positive RAS management. The welfare advantages of RAS — disease control, climate independence, and water use efficiency — are realized only when the system is managed with sufficient attention to the behavioral and physiological needs of the fish.