Salmon Pre-Slaughter Welfare Advances

Slaughter is the highest-risk welfare event in salmon farming. Advances in pre-slaughter handling, crowding reduction, and stunning technology are significantly improving welfare at this critical stage.

Key Facts

Crowding salmon before slaughter to facilitate capture causes acute stress and elevated cortisol.
Asphyxiation in air or ice slurry — once common methods — are now recognized as inhumane and slow.
Percussive stunning (CASH or similar devices) renders salmon immediately insensible before killing.
Electrical stunning can be effective but requires careful current specification for the species and size.
Pre-slaughter fasting reduces gut content contamination but causes hunger stress if extended too long.
RSPCA Assured and GlobalG.A.P. certification schemes now require effective stunning for salmonids.

Welfare Considerations

Slaughter is the moment when welfare improvements can eliminate or dramatically reduce suffering for the billions of fish killed annually. Unstunned slaughter by asphyxiation causes prolonged, conscious distress lasting minutes — a massive aggregate welfare harm. Effective stunning renders fish immediately insensible, ending suffering before killing begins. The technology exists, the evidence is clear, and the costs are manageable. Adoption has accelerated as retailers demand certified humane slaughter from their salmon suppliers. Consumer pressure for certified fish welfare at slaughter is one of the most direct and impactful interventions available.

What You Can Do

Choose salmon certified by schemes that require effective pre-slaughter stunning.
Ask seafood retailers whether their salmon suppliers use humane slaughter methods.
Support regulatory requirements for effective stunning in salmon slaughter.
Engage with aquaculture companies about their slaughter welfare standards and timelines for improvement.
Raise awareness about fish welfare at slaughter as a concrete, solvable issue.