Rainbow trout farming is a major global aquaculture sector. Welfare standards are developing unevenly; understanding current gaps and improvements guides consumer and policy action.
Trout welfare science has advanced significantly over the past decade, providing the evidence base for meaningful standards development. Unlike some aquaculture species, rainbow trout have well-documented stress physiology and behavioral welfare indicators. The welfare priorities are stocking density management, enrichment in the form of current variations and substrate, water quality, and humane slaughter. Consumer pressure for welfare certification is beginning to affect market practice in Europe, where some retailers now require minimum welfare standards for farmed trout.