When Anxiety Drugs Reach Rivers: What Salmon and Thai Waters Could Teach Us
A Swedish study shows that anxiety medications, when present in farmed salmon, can change the fish’s behavior in ways that raise ecological concerns. Salmon exposed to the drug clobazam moved through dangerous turbine barriers more quickly than untreated fish, suggesting bolder, riskier actions that may not be beneficial in the long run.
Researchers from the Swedish University of Agricultural Sciences fed about 280 farmed salmon either clobazam, tramadol, or no drug. The results were clear: higher clobazam levels sped salmon through hydroelectric turbines by two to three times compared with controls. Lead researcher Jack Brand cautioned that altering natural behavior can have broad negative consequences for a population. In practical Thailand terms, bolder salmon could face greater risks navigating man-made barriers in rivers that already host heavy traffic from boats and structures.
