Rainbow trout are one of the most widely farmed fish species globally. Welfare research has advanced, and practical improvements in trout farming are increasingly achievable.
Trout welfare has received more scientific attention than most farmed fish species, and the evidence base for practical improvements is relatively strong. Stocking density directly affects fin integrity and stress responses; reducing density below regulatory maximums produces measurable welfare improvements. Slaughter standards for trout have improved in many European countries, with stunning before killing now common in certified operations. The challenge is extending these improvements across the global trout farming industry, where standards vary widely. Consumer demand for ASC-certified trout provides market incentives for adoption of higher welfare standards. Trout farming represents a case where welfare improvement is technically achievable and increasingly economically viable.