Farmed Salmon Welfare at Harvest

Harvest represents the final welfare event in the farmed salmon lifecycle — crowding during harvest, transport to processing, and slaughter method all determine the quality of death experienced by billions of fish annually.

Key Facts

Atlantic salmon are harvested by crowding net pens to concentrate fish, then pumping or netting them to a wellboat for transport to processing facilities
Crowding during harvest causes extreme density, hypoxia, and physical trauma — welfare indicators deteriorate rapidly as fish are compressed
Wellboat transport time between farm and processing ranges from hours to days — water quality and fish density during transport are critical welfare variables
At processing facilities, salmon are typically stunned using percussion or electrical stunning before killing — quality of stunning varies between facilities
Inadequate percussion stunning leaves fish conscious during subsequent gill cutting — it may take minutes to die through bleeding
CO2 narcosis is used as a pre-stun in some facilities despite evidence of its aversive nature
The RSPCA Assured and Global GAP welfare standards include harvest-specific requirements for stun effectiveness and handling procedures

Welfare Considerations

Harvest welfare for farmed salmon is the welfare dimension most directly in industry control and most amenable to immediate improvement. The technology for effective, rapid stunning exists and is commercially deployed in best-practice facilities. The welfare deficit occurs where economic pressure, throughput speed, or poor facility design leads to inadequate stunning, prolonged crowding, or consciousness during killing. For a species farmed in the billions, even small improvements in harvest welfare translate to enormous reductions in aggregate suffering. Consumer demand for certified products, retailer procurement standards, and regulatory requirements for stunning before killing are the most tractable levers for improvement at scale.

What You Can Do

Choose salmon certified under RSPCA Assured or equivalent standards with harvest welfare requirements
Ask supermarkets about the stunning standards required from their salmon suppliers
Support mandatory pre-slaughter stunning legislation for farmed salmon in all producing countries
Donate to Fish Welfare Initiative working on practical harvest welfare improvements in aquaculture
Advocate for harvest welfare auditing to be included in all aquaculture certification schemes