Rainbow trout are Europe most widely farmed freshwater fish, yet welfare standards lag behind salmon in many respects. Understanding trout-specific welfare needs is essential for meaningful improvement.
Trout welfare receives substantially less attention than salmon welfare despite similar welfare needs and comparable scale of production. The gap reflects both commercial scale (salmon being higher value) and historical research investment that has focused on salmon. Trout are sentient animals with pain responses and stress physiology that create genuine welfare obligations. The stocking density challenge is particularly acute: intensive trout production at high densities creates chronic crowding stress, reduced water quality, and increased disease pressure. The slaughter welfare gap is similar to other fish species: without pre-slaughter stunning, trout die slowly from asphyxiation or direct gutting while conscious. Extending the welfare improvements achieved in salmon to trout production is a clear welfare priority.