Research into environmental enrichment for farmed Atlantic salmon is an emerging field challenging the assumption that fish do not benefit from environmental complexity. Early findings suggest real welfare improvements are possible.
Enrichment research in farmed salmon challenges the industry assumption that fish in sea cages need no environmental complexity beyond adequate water quality and space. The welfare basis for enrichment in salmon is grounded in salmon's evolutionary history as complex, active hunters in varied stream and ocean environments. The monotony of bare circular cages may cause a form of environmental impoverishment even if specific welfare harms are hard to demonstrate with current assessment tools. The emerging research findings - that structured environments reduce aggression, improve fin condition, and may support more natural behavior expression - align with welfare principles while also suggesting potential production benefits. The challenge is developing enrichment that is practical at aquaculture scale, robust to sea conditions, and clearly beneficial enough to justify implementation costs.