Farmed Salmon Pre-Slaughter Welfare: Crowding and Stress

The period immediately before slaughter is among the most welfare-challenging for farmed salmon, with crowding stress, handling, and feed withdrawal creating significant suffering.

Key Facts

Pre-slaughter feed withdrawal of 1-3 days is standard practice to reduce gut contents, but causes hunger stress and increased aggression
Crowding during pre-slaughter aggregation causes physiological stress evidenced by cortisol elevation and behavioral indicators
Pump and crowding equipment can cause physical injuries including scale loss, fin damage, and internal hemorrhage
Electrical stunning immediately before slaughter is increasingly required under European welfare regulations
Research shows cortisol elevation begins within minutes of crowding, with stress responses persisting throughout the pre-slaughter period

Welfare Considerations

Pre-slaughter handling represents a concentrated welfare challenge for farmed salmon where multiple stressors are combined in a short period. Feed withdrawal hunger, crowding-induced aggression, transport pump injuries, and fear responses from unfamiliar handling create substantial welfare burden before the slaughter process itself. Minimizing the duration of each stressor, using gentler pumping equipment, and ensuring effective stunning immediately upon entry to the kill line are the most impactful welfare interventions available at this production stage.

What You Can Do

Choose certified salmon from producers with welfare standards covering pre-slaughter handling protocols
Support regulations requiring maximum feed withdrawal periods and equipment welfare standards for salmon slaughter
Advocate for mandatory third-party auditing of salmon slaughter welfare in major producing countries
Stay informed about aquaculture welfare developments through organizations working specifically on salmon welfare