Aquaculture

Sea Trout Welfare in Estuarine and River Systems

Sea trout are migratory brown trout that travel between rivers and the sea. They face welfare challenges from fish farm sea lice spillover, barriers to migration, and catch-and-release angling.

Key Facts

Sea trout are anadromous brown trout that migrate to sea to feed and return to rivers to spawn
Sea lice from Atlantic salmon farms have caused severe sea trout population collapses in western Scotland and Ireland
Hydropower dams and other migration barriers prevent spawning access
Catch-and-release angling causes physiological stress if not handled correctly
Water temperature and oxygen levels affect welfare during river residence

Welfare Considerations

Sea trout welfare is compromised by sea lice burdens acquired near salmon farms during marine feeding. Heavy lice infestations cause direct tissue damage and can be fatal. Removal of migration barriers improves breeding success and reduces physiological stress from upstream migration failures. Catch-and-release angling causes less welfare harm when fish are handled minimally in cold water and released quickly.

What You Can Do

Support campaigns for sea lice management near wild salmonid rivers
Advocate for fish pass provision on barriers in sea trout rivers
Use minimum-contact catch-and-release handling practices when angling
Donate to Atlantic salmon and sea trout conservation organisations