Farmed Fish Enrichment and Habitat Complexity

Providing environmental complexity and enrichment for farmed fish is an emerging welfare improvement with both ethical and commercial benefits — reducing aggression, improving growth rates, and expressing natural behaviour repertoires.

Key Facts

Salmon and trout in bare circular tanks show elevated aggression, fin damage, and stress responses compared to enriched tanks
Objects including submerged structures, current variation, and substrate improve space use and reduce aggressive interactions in salmonids
Zebrafish research shows that environmental complexity reduces anxiety and improves cognitive performance on spatial tasks
Enrichment for farmed fish is at an early stage compared to mammals; standardised protocols are only beginning to be developed
Commercial aquaculture has been slow to adopt enrichment due to production efficiency concerns and lack of regulatory requirements

Welfare Considerations

Fish enrichment research is at an inflection point — enough evidence now exists to justify enrichment requirements for salmonids in aquaculture, and the commercial benefits in reduced fin damage and improved growth provide economic incentives aligned with welfare outcomes. Leadership from major retailers and certification schemes in requiring enriched aquaculture environments would accelerate industry adoption. Welfare science for less-studied aquaculture species including tilapia, carp, and sea bass is a priority research area.

What You Can Do

Choose aquaculture products from certified farms that include environmental complexity standards
Support research into cost-effective enrichment systems for major aquaculture species
Advocate for enrichment requirements in aquaculture welfare certification frameworks
Reduce consumption of farmed fish as a broader strategy to reduce aquaculture welfare impacts