Mediterranean Aquaculture: Seabream and Seabass Welfare

European seabream and seabass are major aquaculture species in the Mediterranean, produced in offshore net cages. Their welfare is affected by stocking density, disease management, and slaughter method quality.

Key Facts

European seabass (Dicentrarchus labrax) and gilt-head seabream (Sparus aurata) are the primary Mediterranean aquaculture species
Combined annual production exceeds 350,000 tonnes, primarily from Greece, Turkey, Spain, and Italy
Both species are carnivorous, requiring high-protein diets that create sustainability pressures on fishmeal supply chains
Seabream and seabass in offshore cage systems experience seasonal temperature variation of 12-28°C in Mediterranean waters
Nodavirus (VNN) and pasteurellosis are major disease challenges causing mortality and welfare harm in Mediterranean aquaculture
Slaughter of small pelagic fish like seabream commonly uses ice slurry without prior stunning, which has poor welfare implications
Parasitic sea lice are less problematic in Mediterranean aquaculture than in North Atlantic salmon farming

Welfare Considerations

Mediterranean seabream and seabass welfare research is less developed than for Atlantic salmon, but these species demonstrate stress responses, nociception, and social hierarchy behaviours indicating welfare significance. Stocking density in net cages affects aggression and feeding access, with subordinate individuals suffering chronic food competition stress. Disease events cause acute welfare harm through pathogen effects and the stress of mass treatment. Slaughter welfare is the most significant identified welfare issue — ice slurry killing without prior stunning causes conscious death by suffocation over minutes. Electrical stunning before ice slurry is technically feasible and increasingly required by higher welfare certification schemes. Welfare improvements in this sector require both better disease prevention and humane slaughter investment.

What You Can Do

Choose seabream and seabass with ASC, GlobalG.A.P., or equivalent certification that includes welfare standards
Ask retailers about slaughter method requirements in their Mediterranean aquaculture supply chains
Support campaigns for mandatory effective stunning in Mediterranean aquaculture including seabream and seabass processing
Donate to fish welfare organisations working on welfare standards for Mediterranean aquaculture species
Advocate for EU aquaculture welfare regulations that extend effective stunning requirements to all commercially farmed fish species