‘Cocaine Salmon’ Swim Twice as Far as Non-Drugged Fish, New Study Shows
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A new scientific study has found that drug pollution in waterways may be altering the behavior of fish in unexpected ways, including salmon exposed to cocaine showing significantly increased activity levels.
Researchers discovered that salmon exposed to traces of cocaine in contaminated water traveled nearly twice as far as those not exposed to the drug. Instead of staying within their usual ranges, these fish were observed venturing into much wider areas than normal migration patterns would suggest.
It turns out that salmon exposed to cocaine through water pollution do a lot of swimming—which may not be a good thinghttps://t.co/K2tKqRxmUP
— Scientific American (@sciam) April 20, 2026
The findings raise concerns among wildlife experts, who warn that exposure to human-made chemical pollutants in rivers and lakes could push fish into unfamiliar habitats. This kind of disruption may leave them more exhausted than usual, and could potentially weaken their immune systems and affect growth and development.
The study highlights how widespread drug contamination has become in some waterways. In the United Kingdom, residues from recreational drugs are regularly detected in rivers and lakes, with estimates suggesting that the River Thames alone may carry the equivalent of around 80,000 lines of cocaine every day.
The research was carried out through a collaboration involving the Zoological Society of London, Griffith University in Australia, and Dr. Daniel Cerveny of the Swedish University of Agricultural Sciences.
How cocaine pollution is pushing wild salmon past their limits https://t.co/ay6Xok5DrB
— The Times and The Sunday Times (@thetimes) April 20, 2026
A new international study has provided the first evidence that cocaine and its metabolites alter the behavior of fish in their natural habitats.https://t.co/SyI9RvMs51 pic.twitter.com/HM5kpjkqma
— Interesting Engineering (@IntEngineering) April 20, 2026
Dr. Marcus Michelangeli of Griffith University’s Australian Rivers Institute noted that the implications go beyond individual fish behavior. He explained that where fish choose to travel influences what they eat, what predators they encounter, and how entire populations develop over time. If pollution is reshaping these movements, he said, it could have broader effects on ecosystems that scientists are only beginning to fully understand.
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