Aquaculture

Farmed Salmon Crowding Stress Welfare

Crowding is an unavoidable aspect of commercial salmon farming that causes significant stress and welfare compromise.

Key Facts

Commercial salmon cages may hold up to 20 to 25 kg of fish per cubic meter
Crowding triggers stress hormones, reduces immune function, and increases aggression
Pre-harvest crowding for grading and harvesting causes acute severe stress
Operational stocking density regulations exist in Norway but vary globally
Behavioral indicators of crowding stress include surface-swimming and reduced appetite

Welfare Considerations

Chronic crowding causes sustained physiological stress that compromises immune function, wound healing, and overall health. Reducing stocking densities and improving pre-harvest protocols are key priorities.

What You Can Do

Choose salmon products from certified higher welfare farms
Support certification schemes that set meaningful stocking density limits
Advocate for science-based stocking density regulations in aquaculture law