Disease management in farmed trout significantly affects fish welfare, and responsible practices using vaccines, good husbandry, and welfare-conscious treatment protocols can reduce suffering.
Disease in farmed trout represents both a production problem and a welfare problem. Sick fish experience reduced appetite, abnormal behavior, and in severe cases, distress from respiratory or systemic compromise. Responsible disease management focuses on prevention: vaccination programs, appropriate stocking densities, water quality management, and biosecurity protocols that reduce disease pressure. When treatment is required, antimicrobial use should be minimized through use of targeted antibiotics, and fish welfare during treatment (stress from handling, bath treatments) should be actively managed.