Farmed Salmon Hatchery Welfare: The First Weeks of Life

The hatchery phase of Atlantic salmon production involves intense crowding, handling, and environmental manipulation that create welfare risks at the most vulnerable life stage.

Key Facts

Atlantic salmon hatcheries incubate eggs and raise fry to the smolt stage before sea transfer
Water temperature manipulation is used to accelerate or retard development, altering natural photoperiod responses
High stocking densities in troughs and tanks are common practice; crowding in fry causes fin erosion and aggression
Marking procedures including fin clipping and PIT tag implantation are performed without anaesthesia in some operations
Vaccination against furunculosis and other diseases requires handling and injection at the smolt stage
First feeding is a critical welfare event; failure to convert to feed causes starvation mortality
Lighting manipulation is used to prevent early sexual maturation in males (precocious parr)
Water quality management - temperature, oxygen, pH, ammonia - determines disease susceptibility and survival

Welfare Considerations

Hatchery welfare sets the foundation for the entire production cycle. Fish that experience early crowding, handling stress, and poor water quality conditions arrive at sea sites already physiologically compromised. The most impactful welfare improvements in hatcheries are relatively straightforward: lower stocking densities in early rearing, improved first-feeding protocols, anaesthesia for marking procedures, and water quality optimisation. These improvements also reduce mortality and improve growth rates, making the welfare case and the productivity case the same.

What You Can Do

Choose salmon certified under welfare schemes that include hatchery standards
Advocate for hatchery welfare criteria to be included in all farmed salmon certification
Support research into lower-stress marking and vaccination methods for fish
Ask retailers about welfare standards across the full salmon production cycle from hatchery to harvest
Reduce farmed salmon consumption or choose certified alternatives to reward welfare investment