Aquaculture Salmon Slaughter Methods and Pre-Slaughter Welfare

Pre-slaughter handling and killing methods for farmed salmon have major welfare implications, with evidence that fish experience stress and potentially pain during common procedures.

Key Facts

Crowding during harvest causes stress in salmon measurable via cortisol elevation
Carbon dioxide stunning is now considered poor practice due to aversive properties
Percussive stunning followed by gill cutting is considered among the better methods
Controlled drowning in ice slurry without stunning causes prolonged suffering
Norwegian regulations require salmon to be stunned before killing
Research shows salmon show pain-related responses to noxious stimuli with anatomical capacity for nociception

Welfare Considerations

Salmon slaughter welfare is an active area of research and regulation. Evidence that fish are sentient and capable of suffering has strengthened arguments for humane slaughter methods. The shift away from ice slurry killing and CO2 stunning toward percussive or electrical stunning represents meaningful welfare progress, though implementation varies widely by country and producer.

What You Can Do

Choose farmed salmon from producers certified for humane slaughter practices
Support regulatory standards requiring effective stunning before slaughter for farmed fish
Donate to fish welfare research organizations working to improve slaughter methods
Advocate for stronger aquaculture welfare regulations in your country