Barramundi farming is expanding across Asia and Australia with growing welfare considerations for this large, predatory fish species in intensive production systems.
Barramundi welfare reflects the challenges of farming a large, active predatory fish in confined systems. Their predatory nature means they are cognitively alert to their environment in ways that may make confinement stress more acute than for filter feeders or less active species. Cannibalism during juvenile phases is a welfare problem in both directions — predators and prey experience the welfare costs of uncontrolled aggressive predation. Size grading to maintain similar-sized cohorts reduces this welfare problem substantially. High stocking densities create chronic crowding stress documented in elevated cortisol and altered behavior. Salinity transitions between production phases impose osmoregulatory stress that requires careful management for welfare and production alike. Barramundi welfare research has expanded as the species has gained commercial importance — welfare standards are developing though not yet comprehensively established in most producing countries.