Farmed Salmon Life Cycle Welfare: From Hatchery to Harvest

Farmed Atlantic salmon experience welfare challenges at every life stage from hatchery through seawater transfer to harvest that require species-specific management.

Key Facts

Atlantic salmon farming involves distinct life stages each with characteristic welfare challenges: hatchery, freshwater grow-out, seawater transfer, and marine grow-out
Smoltification — the physiological transition from freshwater to seawater — is a stressful developmental event that requires careful management
Crowding during seawater transfer causes cortisol elevation, immune suppression, and increased disease susceptibility in post-smolt salmon
Cataract prevalence in farmed salmon is extremely high, affecting up to 80% of some populations and causing significant vision impairment
Spawning physiology activation in farmed salmon at end of production causes characteristic behavioural changes indicating welfare compromise
Pre-slaughter crowding and handling stress can be minimised through careful management that reduces welfare harm at harvest

Welfare Considerations

Salmon welfare across the full life cycle requires stage-specific assessment and management because welfare challenges differ substantially between hatchery, freshwater, and marine phases. The smolt transfer is a physiological crisis that welfare management can support or exacerbate through handling quality and transport conditions. Cataract prevalence is a chronic welfare problem linked to nutritional factors whose industry-wide improvement is ongoing. End-of-production welfare at slaughter receives the most consumer attention but life-cycle welfare assessment reveals that welfare investments are needed across all production stages.

What You Can Do

Support aquaculture certification schemes that require welfare assessment across the full salmon production life cycle
Ask seafood suppliers whether their farmed salmon is sourced from operations with documented welfare management throughout production
Advocate for cataract reduction to be included as a welfare metric in farmed salmon certification standards
Follow welfare research into salmon life-cycle management and share information with seafood consumers