Farmed Salmon Pre-Slaughter Handling and Crowding

The period immediately before salmon slaughter involves multiple handling events that cause significant welfare harm. Improving pre-slaughter protocols reduces suffering in the final hours of salmon's lives.

Key Facts

Salmon are typically starved for 24-72 hours before slaughter to clear gut contents
Crowding during this period involves moving fish from farming pens into smaller holding areas
Pumping fish from sea cages to well boats involves passage through pipes and pressure changes
Fish density during crowding can reach 10 times normal farming density causing acute stress
Norwegian processing plants have adopted controlled water flow systems reducing crowding stress
Electronic stunning before killing is mandatory in Norway and increasingly widespread
Some facilities achieve near-instantaneous killing through combination of electrical stunning and gill cutting
Welfare protocols covering the pre-slaughter period have been developed by RSPCA and ASC

Welfare Considerations

The pre-slaughter phase for farmed salmon is one of the most welfare-significant periods of their lives. The accumulation of stressors over 24-72 hours - food withdrawal, increased crowding, noise from pumps, transport, and the physical stresses of pumping - creates a period of acute welfare compromise before slaughter. Fish show measurable physiological stress throughout this period including elevated cortisol and impaired osmoregulation. The development of welfare protocols specifically addressing pre-slaughter handling represents recognition that the journey to slaughter matters as much as the slaughter itself. Industry variance in pre-slaughter welfare is significant - facilities with modern crowding systems and rapid stunning produce dramatically better welfare outcomes than those using traditional crowding and delayed or inadequate stunning.

What You Can Do

Choose salmon with RSPCA Assured certification covering pre-slaughter handling standards
Advocate for mandatory pre-slaughter welfare protocols in salmon aquaculture licensing
Support Fish Welfare Initiative engagement with the salmon industry on pre-slaughter standards
Donate to organizations developing and promoting welfare assessment tools for pre-slaughter salmon
Reduce farmed salmon consumption or choose certified products with transparent pre-slaughter welfare
Engage with retailers about their supplier requirements for pre-slaughter salmon welfare