Drug pollution alters salmon migration

Study reveals commonly detected environmental levels of clobazam — a medication often prescribed for sleep disorders — increased the river-to-sea migration success of juvenile salmon in the wild. The research team employed slow-release pharmaceutical implants and animal-tracking transmitters to monitor how exposure to clobazam and the opioid painkiller tramadol — another common pharmaceutical pollutant — affected the behaviour and migration of juvenile Atlantic salmon (Salmo salar) in Sweden’s River Dal as they migrated to the Baltic Sea.
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