Aquaculture and Fish Welfare

Salmon Welfare and Crowding Stress at Harvest

Crowding salmon for harvest causes acute stress responses measurable in cortisol, behaviour and immune function. Minimising crowding duration and intensity is a welfare priority.

Key Facts

Cortisol spikes during crowding can persist for hours after the event
Pre-harvest crowding compromises flesh quality as well as welfare
Fish welfare indicators include opercular rate, body posture and loss of equilibrium
Two-hour fast before crowding reduces metabolic stress in salmon
Electrostunning immediately after crowding minimises consciousness of distress

Welfare Considerations

Harvest crowding is unavoidable but its intensity can be significantly managed. Protocols that minimise crowding duration and immediately follow with effective stunning are welfare best practice.

What You Can Do

Support salmon welfare certification schemes that audit pre-harvest handling
Advocate for maximum crowding duration standards in salmon harvest protocols
Choose certified welfare-positive salmon where available