Farmed Salmon Pre-Slaughter Welfare: Crowding and Stress Reduction

The final stages before slaughter are among the most stressful for farmed salmon. Pre-slaughter crowding, air exposure, and rough handling cause significant welfare harm.

Key Facts

Crowding salmon during harvest causes elevated cortisol for hours before slaughter
Air exposure, even briefly, is highly aversive and stressful for fish
RSPCA and other welfare bodies have published salmon slaughter guidelines
Electrical stunning before slaughter can render fish insensible immediately
Pre-slaughter fasting of several days is standard but causes chronic hunger

Welfare Considerations

Pre-slaughter handling represents a critical welfare window for farmed salmon. Crowding concentrates fish to densities causing injuries and extreme physiological stress. Air exposure and rough handling during transfer cause measurable suffering. Effective stunning — whether electrical, percussive, or CO2 — is essential to minimize suffering at the moment of death. Reform in pre-slaughter welfare, particularly faster crowding periods and immediate effective stunning, could significantly reduce suffering for billions of fish annually.

What You Can Do

Choose farmed salmon certified by programs with pre-slaughter welfare standards
Support RSPCA Assured or equivalent welfare certification for farmed fish
Advocate for mandatory fish stunning requirements in your country
Support research into rapid, effective stunning methods for commercial fish slaughter