Atlantic Salmon Smolt Welfare During Seawater Transition

Welfare challenges during the smoltification and sea transfer phases of salmon farming.

Key Facts

Smoltification is a physiological transformation that prepares salmon for seawater
Photoperiod manipulation controls smolt timing — welfare implications of artificial light management
Sea transfer involves crowding, pumping, and well-boat transport — significant welfare stressors
Mortality during and after sea transfer is a key welfare indicator

Welfare Considerations

Smolt welfare during sea transfer is affected by crowding during dewatering, pump handling, well-boat transport, and release into sea cages. Each step involves physiological stress on animals undergoing a major life transition. Welfare-focused smolt transfer protocols minimise crowding duration, monitor welfare indicators throughout transport, and use anaesthesia or sedation for particularly stressful procedures. Post-transfer welfare monitoring tracks adaptation to marine conditions.

What You Can Do

Support research into improved salmon smolt transfer methods and welfare indicators
Advocate for welfare standards that address smolt transfer as a distinct welfare-critical phase
Choose salmon certified to welfare schemes that include smolt transfer welfare criteria