Black sea bass farming is expanding in the US as an alternative to overfished wild populations. As a relatively new aquaculture species, welfare standards and best practices are still being established.
Black sea bass welfare in emerging aquaculture systems involves managing the species' inherent aggression, territorial behaviour, and sensitivity to crowding. Sex ratio management is critical because dominant males harass females and subordinate males, causing chronic stress and injury. Grading fish by size and maintaining appropriate stocking densities reduces aggression-related welfare issues. Water quality in RAS systems must be carefully managed to maintain ammonia, nitrite, and carbon dioxide within safe ranges — high CO2 in particular causes respiratory distress and behavioural changes. Slaughter welfare standards are not yet formalised for black sea bass, and the species should be included in any species-specific guidance development. Early investment in welfare science for this emerging species will shape long-term industry standards.