Cocaine pollution is altering the natural behaviour of Atlantic salmon, with experimental findings showing they swim twice as far in polluted waters. A study by researchers from Griffith University and others found that juvenile salmon exposed to benzoylecgonine, a cocaine metabolite commonly detected in wastewater, swam up to 1.9 times farther than their sober counterparts.

The location of fish is crucial for determining what they eat and who eats them; altered patterns due to pollution could significantly impact ecosystem dynamics, say the researchers. While effects on sharks have also been noted, less is known about wild animals' experiences with cocaine contamination.

Notably, the study found that exposure to benzoylecgonine had a more pronounced effect than direct cocaine exposure, suggesting waterways may be more affected by metabolites than previously thought. This could challenge current risk assessments which focus on the main compound, potentially overlooking crucial biological impacts.

The implications are vast; if even aquatic life is under the influence of human drugs, we might need a more holistic approach to pollution control. The researchers will continue their work to identify at-risk species and assess whether altered behaviour translates into survival changes for these fish.