Rainbow trout are among the most farmed fish globally. Their welfare needs include appropriate water quality, social environments, and humane handling and slaughter.
Farmed rainbow trout experience welfare challenges including crowding stress, aggressive interactions, dorsal fin erosion, and disease outbreaks. Water quality management is central to welfare, as poor oxygen levels or elevated temperatures cause chronic stress. Handling during grading, transport, and slaughter are high-stress events requiring careful management. Percussive or electrical stunning before slaughter can prevent conscious suffering, but implementation varies widely. Welfare indicators including fin condition, behaviour, and growth rate help producers monitor flock welfare.