Aquaculture

Farmed Salmon Pre-Harvest Crowding Advanced

Pre-harvest crowding for grading, counting, and harvest access causes acute severe welfare compromise requiring careful protocol management.

Key Facts

Pre-harvest crowding concentrates salmon to densities 10 to 20 times normal stocking levels
Crowding causes immediate cortisol spikes, oxygen depletion, and mechanical injury from collision
Crowding duration should be minimized to under 2 hours to reduce welfare impact
Feed withdrawal combined with crowding has additive negative effects on salmon welfare
Behavioral indicators of extreme crowding stress include surface-swimming and reduced avoidance responses

Welfare Considerations

Salmon experiencing pre-harvest crowding suffer acute severe physiological and behavioral stress. Minimizing crowding duration and density, and monitoring behavioral indicators, are essential welfare protocols.

What You Can Do

Support salmon from farms with documented pre-harvest welfare protocols including crowding limits
Advocate for mandatory pre-harvest welfare assessment requirements in aquaculture regulations
Choose salmon certification schemes that include pre-harvest handling standards