Aquatic Animal Welfare

Fish Welfare During Net Pen Aquaculture

Net pen aquaculture for salmon and other species raises significant welfare concerns around crowding, disease, water quality, and handling stress that affect billions of fish annually.

Key Facts

Norway alone farms over 400 million Atlantic salmon annually
Sea lice infestations cause pain and can be lethal if untreated
Crowding densities in net pens often exceed welfare thresholds
Gill disease from algae blooms is a leading cause of aquaculture mortality
Welfare indicators include fin damage, eye cataracts, and swimming behavior

Welfare Considerations

Fish in net pens experience chronic crowding stress, parasite burden, and environmental fluctuations. Evidence supports that fish have nociceptors and stress responses analogous to pain. Welfare improvements include lower stocking densities, freshwater delicing treatments over chemical treatments, environmental enrichment, and humane slaughter protocols.

What You Can Do

Look for welfare-certified farmed fish from ASC or equivalent programs
Ask retailers about their aquaculture supplier welfare standards
Support research into humane fish slaughter and stocking density limits
Reduce farmed salmon consumption or choose certified welfare-friendly options