Farmed Salmon Pre-Slaughter Welfare

The period immediately before slaughter is a critical welfare stage for farmed salmon. Crowding, fasting, and handling procedures cause acute stress that modern stunning systems can significantly reduce.

Key Facts

Farmed salmon are typically fasted for 24-72 hours before slaughter to clear gut contents, causing prolonged hunger stress
Crowding before slaughter at densities far above normal farming levels causes severe acute stress
Traditional slaughter by live immersion in ice slurry keeps salmon conscious for up to 9 minutes
Electrical stunning renders salmon immediately unconscious and is increasingly adopted in Norway and Scotland
Percussion stunning is used in some systems but requires precise application to be effective
Scotland produces approximately 165,000 tonnes of farmed salmon annually, making slaughter scale enormous

Welfare Considerations

Pre-slaughter welfare for salmon represents one of the highest-impact welfare improvement opportunities in aquaculture. The transition from ice-bath to stunning-based slaughter eliminates minutes of consciousness in aversive conditions for billions of fish annually. Norwegian aquaculture regulations now require electrical stunning before slaughter for Atlantic salmon, and Scottish and Chilean producers are adopting the technology. The commercial case is positive as well: properly stunned fish show better flesh quality from reduced stress-hormone effects. Crowding duration and density are the next welfare frontiers; protocols that minimize pre-slaughter handling stress complement stunning improvements.

What You Can Do

Choose Scottish or Norwegian certified salmon products that specify electrical pre-stunning before slaughter
Support aquaculture welfare certification schemes that require pre-slaughter stunning for salmonids
Advocate for mandatory stunning requirements in fish slaughter welfare regulations
Ask retailers to disclose the slaughter methods used in their salmon supply chains