Rainbow trout are among the most important farmed fish globally, but welfare standards in trout aquaculture vary enormously, with density, water quality, and slaughter methods critically affecting fish experience.
Trout farming presents a genuine tension between economic viability and animal welfare. High densities maximise production efficiency but compromise fish welfare through chronic stress, injury, and disease. The evidence base for fish sentience is robust enough that regulators in the EU and UK have established specific welfare requirements for trout slaughter. However, farm-level welfare during the grow-out phase remains poorly monitored. Consumer demand for certified welfare products and regulatory pressure are the primary levers for systemic improvement.