Environmental Enrichment for Farmed Salmon: An Emerging Field

Environmental enrichment for farmed Atlantic salmon is an emerging welfare approach, with research suggesting that habitat complexity reduces aggression and stress in commercial pen systems.

Key Facts

Atlantic salmon in sea pens swim in circular patterns for 90%+ of their time — far from natural river behaviour
Submerged lights attract zooplankton, which salmon hunt — providing enrichment that reduces stereotypic behaviour
Current provision, shelter structures and artificial substrates have been trialled with variable welfare results
Norwegian salmon welfare regulations now include requirements for environmental complexity in sea pen standards
Salmon show individual differences in boldness and stress reactivity that affect how enrichment benefits them

Welfare Considerations

Enrichment for farmed salmon faces unique challenges compared to terrestrial livestock: fish welfare assessment is difficult, enrichment effects are hard to monitor at scale, and the sea pen environment is inherently constrained. Yet research consistently shows that habitat complexity — current provision, light manipulation, physical structures — reduces aggression, stereotypic swimming and stress markers in farmed salmon. As welfare science for fish matures, environmental enrichment will likely become a standard component of high-welfare aquaculture alongside stunning requirements and density management.

What You Can Do

Choose salmon certified to standards that include environmental enrichment requirements
Support the Aquatic Life Institute in developing salmon enrichment welfare standards
Advocate for environmental complexity requirements to be incorporated in salmon farm licensing
Follow Norwegian salmon welfare research — Norway leads the world in farmed fish welfare science
Engage with retailers about including salmon environmental enrichment requirements in their supply chain standards