Aquaculture

Farmed Salmon Crowding Before Harvest: Stress Indicators

Pre-harvest crowding of salmon causes measurable physiological stress that is an indicator of poor final welfare.

Key Facts

Crowding before harvest activates the stress axis and elevates cortisol for hours
Crowded salmon show fin and scale damage from collisions in dense groups
Welfare quality assessments at pre-slaughter provide feedback for farm improvement
Extended crowding reduces flesh quality as well as animal welfare

Welfare Considerations

Pre-harvest crowding is one of the most intensely stressful events in a farmed salmon's life. Minimising crowding duration, avoiding repeated crowding, and moving to effective pre-slaughter stunning reduces the total welfare cost of this phase.

What You Can Do

Support aquaculture welfare certification standards covering pre-harvest crowding limits
Advocate for mandatory pre-harvest welfare assessment in salmon farming regulation
Choose salmon from producers who publish pre-harvest welfare performance data