Story perspectives

Cocaine Exposure Causes Salmon to Swim Farther, Study Finds

4/23/2026

Summary

Story summary

A study in Sweden's Lake Vättern found that juvenile Atlantic salmon exposed to cocaine and its metabolite benzoylecgonine swim farther and disperse more widely than unexposed fish.
Salmon exposed to benzoylecgonine implants swam nearly 14 kilometers more per week than controls.
Researchers say these changes could affect foraging and survival and stress the need to consider drug metabolites, which can occur at higher concentrations than parent compounds.

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Story summary

A study in Sweden's Lake Vättern found that juvenile Atlantic salmon exposed to cocaine and its metabolite benzoylecgonine swim farther and disperse more widely than unexposed fish.
Salmon exposed to benzoylecgonine implants swam nearly 14 kilometers more per week than controls.
Researchers say these changes could affect foraging and survival and stress the need to consider drug metabolites, which can occur at higher concentrations than parent compounds.