Rainbow trout is one of Europe's most important farmed fish species. Welfare standards are developing faster for trout than for many other farmed fish species, offering lessons for the broader industry.
Rainbow trout occupy an interesting position in aquaculture welfare: they are among the most studied farmed fish species from a welfare perspective, and some certification schemes include meaningful welfare standards. The combination of a well-established research base, a developed certification market, and consumer interest in welfare has created conditions for genuine welfare progress in the trout sector. The RSPCA Assured scheme for UK trout, with its requirements on stocking density, water quality, and slaughter method, provides a model for what fish welfare certification can achieve. The ongoing challenges are enforcement depth, ensuring standards are met in practice rather than on paper, and extending welfare improvements to the many uncertified trout operations across European markets.