Providing environmental enrichment to farmed rainbow trout can reduce stereotypic behaviors, improve welfare indicators, and in some cases enhance production outcomes.
Rainbow trout are sentient fish capable of learning, showing preferences, and experiencing stress. Intensive aquaculture systems typically provide barren, uniform environments that prevent the behavioral complexity natural to stream-dwelling fish. Simple enrichment modifications — flow variation, cover objects, substrate patches — can reduce stress indicators and improve welfare outcomes without major capital investment. The challenge is scaling these interventions to commercial tank densities while maintaining water quality. Research into practical, cost-effective enrichment for commercial trout production is an active and promising field.