Sea Trout in Aquaculture and Conservation

Sea trout (anadromous brown trout) occupy an uncertain position between wild conservation and aquaculture contexts.

Key Facts

Sea trout are the migratory form of brown trout returning to rivers to spawn after years at sea
They are not farmed commercially but are affected by aquaculture through disease transmission
Sea lice from salmon farms cause welfare problems for wild sea trout passing farm locations
River restoration improving salmon habitat simultaneously benefits sea trout populations
Sea trout are highly susceptible to disease from farmed fish and require clean river environments

Welfare Considerations

Sea trout welfare at the wild-aquaculture interface demonstrates how intensive farming affects wild populations beyond the farm boundary. Sea lice loads from salmon farms can be extremely high on wild sea trout passing in proximity, causing skin damage and secondary infection. Individual sea trout in river systems near salmon farms carry dramatically higher lice burdens than those in areas without farms. Regulatory separation of salmon farms from key sea trout migration routes and lice management requirements are the primary welfare interventions available for this interface problem.

What You Can Do

Support river restoration improving sea trout habitat quality and migration access
Advocate for salmon farm siting regulations protecting sea trout migration routes
Choose salmon certified to standards with strict sea lice management requirements
Support research into the welfare impacts of aquaculture on adjacent wild fish populations