Rainbow trout are among the most farmed fish globally. Understanding and improving their welfare is critical, as evidence of their sentience and capacity for suffering continues to grow.
Rainbow trout are conscious, responsive animals with complex neural systems capable of processing nociceptive information. Welfare failures in trout farming — high stocking densities, poor water quality, rough handling, inadequate stunning — cause genuine suffering at enormous scale. The ethical weight of farmed fish welfare is often underestimated because fish are perceived as less sentient than mammals. But the scientific consensus is shifting: trout show consistent responses to harmful stimuli that parallel pain responses in other vertebrates. Welfare improvement in trout farming is ethically urgent.