Concerns have arisen in recent times regarding the pollution of marine life with substances discharged into the world’s oceans by human activities.
A recent research study revealed that sharks in a popular vacation destination in the Bahamas have tested positive for caffeine, painkillers, and cocaine for the first time ever.
The study, conducted by the Federal University of Parana and published in the Environmental Pollution journal last month, examined marine life in the area.
The analysis indicated that waste generated by tourism and diving activities was leading sharks to consume substances that had been discarded into the ocean.
Within this context, drugs and pharmaceuticals fall into the category of Contaminants of Emerging Concern (CECs) due to their potential impact on wildlife.
The project’s lead researcher, Natascha Wosnick, reported that after analyzing blood samples from 85 sharks around Eleuthera Island, a third of them showed traces of pharmaceuticals, as per 20 minutos.
Described as the first study of its kind, the research emphasized the crucial need to comprehend the effects of these chemicals on sharks for ecological and economic reasons.
The authors highlighted, “Therefore, understanding the impact of these contaminants on shark physiology and long-term population health is essential not only to protect a vital ecological element of coastal ecosystems but also to preserve the social and economic advantages they offer.”
Regarding the source of contamination, the authors suggested that, aside from individual human activities, it could also be linked to lost or discarded drug shipments.
This discovery of cocaine in sharks is not unprecedented, with a study in Brazil finding the presence of the drug and raising concerns among scientists about potential behavioral changes in the sharks.
Similar to the Bahamas study, researchers proposed multiple reasons for the sharks’ ingestion of these substances.
Researchers, who published their findings in the Science of the Total Environment journal, examined 13 Brazilian sharpnose sharks caught by fishermen, with most showing high levels of the illicit drug.
British scientist Rachel Ann Hauser-Davis, part of the team from the Oswaldo Cruz Foundation, commented in 2024 that their study revealed “chronic exposure due to human use of cocaine in Rio de Janeiro and the discharge of human waste by sewage outfalls, as well as from illegal drug labs.”
Researchers cautioned that the sharks’ behavior could be impacted by drug ingestion, necessitating further investigation.
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