Farmed Fish Pain and Slaughter Welfare

Fish slaughter methods in aquaculture vary widely in their welfare impact. Many current practices cause prolonged suffering; alternatives exist and are increasingly available.

Key Facts

The most common slaughter methods for farmed fish — live chilling in ice slurry and asphyxiation in air — are associated with prolonged conscious suffering
Evidence from Atlantic salmon and rainbow trout shows continued sensory brain activity for minutes after decapitation without prior stunning
Percussion stunning followed by spiking (ike jime) and electrical stunning are the most welfare-positive methods currently available
Controlled atmosphere killing using high CO2 concentrations causes distress before loss of consciousness and is not considered humane
The RSPCA Assured salmon standard requires electrical stunning before slaughter — demonstrating commercial feasibility
Regulatory requirements for pre-slaughter stunning of fish are absent in most countries, unlike for mammals and birds

Welfare Considerations

Fish slaughter welfare is a significant and largely unaddressed issue at massive scale. Billions of farmed fish are killed annually using methods that cause prolonged suffering, despite alternatives being technically and commercially available. Closing the gap between current practice and welfare-positive alternatives requires regulatory action, industry investment, and market pressure through welfare certification. The evidence base for fish pain is now strong enough that failure to act is indefensible on scientific grounds.

What You Can Do

Choose farmed fish products certified to welfare standards that require pre-slaughter stunning
Advocate for regulatory bodies to mandate pre-slaughter stunning for farmed fish species
Support organizations working on fish welfare in aquaculture and pushing for evidence-based regulatory reform
Reduce consumption of farmed fish produced without welfare standards, particularly species associated with inhumane slaughter