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Cocaine sharks: Brazilian study shows marine predators ‘high’ on drug

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Scientists discovered high levels of cocaine in Brazilian sharpnose sharks off Rio de Janeiro, raising concerns about behavioural impacts. The study f

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Scientists discovered high levels of cocaine in Brazilian sharpnose sharks off Rio de Janeiro, raising concerns about behavioural impacts. The study found chronic exposure, with cocaine concentrations up to 100 times higher than in other marine animals. Potential sources include drug lab drainage or untreated sewage. This marks the first evidence of cocaine in free-ranging sharks, with further studies required.

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