Gilthead Seabream: Welfare in Mediterranean Intensive Aquaculture

Gilthead seabream is one of the most important aquaculture species in the Mediterranean, with established welfare concerns around stocking density, parasite loads, and slaughter practices.

Key Facts

Gilthead seabream production in the Mediterranean exceeds 200,000 tonnes annually
Main producers are Greece, Turkey, Egypt, and Spain
Sea lice and other ectoparasites are significant welfare and production challenges in net-pen farming
Seabream are euryhaline, tolerating a wide range of salinities, aiding culture flexibility
They are sensitive to crowding stress, showing suppressed immune function at high densities

Welfare Considerations

Gilthead seabream in intensive systems face chronic welfare challenges from overcrowding, which causes persistent stress and immunosuppression. Sea lice infestations cause skin damage, irritation, and secondary infections that impair feeding and growth. Chemical treatments for parasites including hydrogen peroxide and pyrethroids cause acute stress responses and can cause mortality when improperly applied. Slaughter by asphyxiation in air or ice slurry without stunning is the industry standard in many countries, causing prolonged stress and pain. Growth-related spinal deformities, found in a proportion of intensively farmed seabream, cause chronic discomfort.

What You Can Do

Choose seabream certified by the ASC or organic standards requiring welfare audits
Support EU and national campaigns for mandatory fish stunning before slaughter
Ask fishmongers and restaurants about the welfare standards of their seabream suppliers
Support research into effective sea louse management methods with lower welfare costs
Advocate for welfare standards to be included in seabream aquaculture permitting