Sea trout (migratory brown trout) are important sport fish across the UK and Northern Europe. Their welfare during angling, population management, and river restoration programmes is receiving increasing scientific attention.
Sea trout welfare in recreational angling follows the same principles as all salmonid catch-and-release: barbless hooks, minimal air exposure (under 20 seconds), water temperature assessment (no catch-and-release in water above 20°C), and wet-hands handling reduce post-release mortality. Sea trout are particularly sensitive to handling during the run upstream — anaerobic muscle exhaustion from a hard fight in warm water can cause delayed mortality even after apparently successful release. Population welfare intersects with conservation — sea lice parasitism from salmon farms reduces sea trout survival at sea, causing both individual welfare harm and population-level stress. Effective management requires addressing the salmon farming sea lice vector alongside angling pressure and river habitat restoration. Conservation stocking with farmed trout is sometimes used but introduces welfare concerns for stocked fish and genetic risks for wild populations.