Rainbow trout is one of the most widely farmed fish species globally. Understanding the welfare challenges in trout production helps advocates identify key areas for improvement.
Rainbow trout welfare in aquaculture has received more scientific attention than most farmed fish species, partly due to their importance in laboratory welfare research. This knowledge has informed practical welfare standards including stocking density limits, water quality requirements, and pre-slaughter stunning protocols. The RSPCA Assured standard for trout is among the most developed welfare certification schemes for any farmed fish species. The remaining welfare challenges include enforcing standards consistently across diverse production systems, extending certification adoption beyond progressive producers, and addressing fin erosion from crowding that remains prevalent even in certified systems. Trout aquaculture provides a model for what fish welfare certification can achieve and the baseline from which other species standards should be developed.