Aquaculture Welfare

Atlantic Salmon Welfare and Pre-Slaughter Crowding Stress

Pre-slaughter handling in salmon aquaculture involves crowding, pumping, and transfer operations that cause intense stress responses measurable in cortisol, behaviour, and mortality. Welfare at slaughter is a critical gap in aquaculture standards.

Key Facts

Atlantic salmon are sentient vertebrates with demonstrable pain and stress responses
Pre-slaughter crowding to high densities causes hypoxia, scale loss, and cortisol spikes
Percussive stunning followed by exsanguination is the welfare gold standard for salmon slaughter
Carbon dioxide stunning, still used in some facilities, causes aversion responses and prolonged distress
Norwegian and Scottish authorities have begun requiring welfare monitoring at harvest

Welfare Considerations

Pre-slaughter crowding and pumping represents one of the largest-scale welfare problems in animal production, affecting hundreds of millions of salmon globally. Salmon that experience severe stress before slaughter show elevated cortisol for hours, impaired meat quality, and high rates of traumatic injury. Adoption of electrical stunning or percussive stunning significantly reduces pre-slaughter suffering and improves both welfare and product quality.

What You Can Do

Choose salmon from suppliers certified by RSPCA Assured or Global Welfare Assurance
Ask retailers about their salmon supplier slaughter welfare requirements
Support Aquatic Life Institute campaigns for mandatory humane slaughter standards
Advocate for Scottish and Norwegian authorities to mandate welfare-positive slaughter methods
Reduce salmon consumption and choose certified welfare standards when you do buy