European Sea Bass Welfare in Aquaculture

Key Welfare Considerations

• Sea bass are carnivorous, active fish requiring high protein diets and adequate swimming space for welfare.
• Optimal welfare temperatures are 18-25°C — thermal stress at extremes impairs immune function and welfare.
• Sea bass are euryhaline, tolerating wide salinity ranges, but welfare is optimised at 28-35 ppt.
• Stocking density significantly affects sea bass welfare — aggression and fin damage increase above 20kg/m³.
• Sea bass are dominance-hierarchy forming species — size grading reduces welfare aggression in production groups.
• Photophobia (light avoidance) is well-documented — lighting management affects welfare significantly.
• Vibriosis and pasteurellosis are significant bacterial welfare diseases in intensive sea bass production.
• Vaccination programmes against major bacterial pathogens reduce antibiotic use and improve welfare.
• Sea bass show clear individual personality differences — welfare assessment should account for variation.
• Cortisol stress response measurement provides objective welfare indicators during handling and crowding.
• Pre-slaughter welfare requires appropriate stunning — electrical or percussion methods are used commercially.
• Asphyxiation in air causes prolonged conscious welfare suffering — this method should be eliminated.
• Sea bass welfare certification standards are developing — proactive industry engagement improves outcomes.
• Environmental enrichment through current provision reduces stereotypic swimming welfare behaviour.
• Sea bass welfare science contributes to broader Mediterranean aquaculture welfare standard development.