How salmon hatchery practices affect both hatchery fish welfare and wild salmon populations, and what better management looks like.
Salmon hatchery welfare presents layered challenges. The welfare of fish during their hatchery phase depends on water quality, stocking density, handling frequency, and disease management — all areas where standard practice often falls short. Beyond individual fish welfare, hatchery programmes have ecological welfare implications: by releasing fish adapted to artificial conditions into the wild, they may weaken the genetics of wild populations that have evolved to specific habitat conditions. Hatcheries that invest in environmental enrichment, appropriate social conditions, and gradual conditioning to natural environments show improved post-release survival — suggesting that better welfare during rearing also produces better ecological outcomes.