Aquaculture Welfare

Farmed Salmon Crowding Stress at Harvest

Crowding during harvest is one of the most significant acute welfare challenges facing farmed Atlantic salmon.

Key Facts

Crowding triggers a strong stress response in salmon including cortisol release
Fish experience impaired respiration during high-density crowding events
Crowding at harvest can last from minutes to hours depending on facility design
Careful crowding protocol design can substantially reduce peak stress exposure
Monitoring oxygen levels during crowding is critical to avoid mass mortality events

Welfare Considerations

Harvest is often the single most stressful event in a farmed salmon's life. The acute physiological and likely affective impact of crowding merits serious attention. Improvements to harvest protocols, facility design, and monitoring technology can meaningfully reduce the severity and duration of this stress.

What You Can Do

Support aquaculture certification schemes that include harvest welfare standards
Advocate for mandatory welfare monitoring during salmon crowding and harvest
Choose seafood certified to welfare standards that cover harvest conditions