Aquaculture Salmon Pre-slaughter Welfare

How pre-slaughter management of farmed salmon affects their welfare in the final hours of life.

Key Facts

Pre-slaughter crowding, pumping, and transport cause significant stress in farmed salmon
Feed withdrawal periods before slaughter reduce gut contamination but cause hunger stress if prolonged
Water quality deteriorates rapidly during crowding, compounding physiological stress
Electrical stunning before slaughter is required in some jurisdictions and rapidly induces insensibility
Percussive stunning is used in some operations as an alternative to electrical stunning
Post-slaughter quality of salmon flesh is directly affected by pre-slaughter stress levels

Welfare Considerations

The final hours of a farmed salmon's life involve a series of welfare-significant events — crowding, pumping from pen to well boat, transport, and slaughter — that are among the most stressful experiences in the animal's life. Even with effective stunning, the pre-slaughter period can involve significant suffering if management is poor. The alignment between welfare and product quality in salmon slaughter is strong: stressed fish produce lower-quality flesh with reduced eating quality, creating commercial incentives that complement welfare motivations. Pre-slaughter welfare improvement is one of the areas where aquaculture welfare progress has been most rapid.

What You Can Do

Support salmon certification schemes that include pre-slaughter welfare requirements
Choose farmed salmon from operations with documented electrical or percussive stunning at slaughter
Advocate for mandatory pre-slaughter stunning requirements for farmed salmon in all major producing countries
Engage with retailers about the welfare standards they require for salmon slaughter in their supply chains
Support research into optimal pre-slaughter management protocols that minimize stress duration