Marine biologists have discovered cocaine in sharpnose sharks off the coast of Rio de Janeiro, marking the first instance of the drug being found in free-ranging predators.

Thirteen sharks were tested, revealing high levels of cocaine and benzoylecgonine, with female sharks showing higher concentrations in their muscles than males.

The study, dubbed “Cocaine Shark,” suggests a potential link between a shark’s size and its ability to metabolize cocaine, though further research is needed.

Experts propose several theories on how cocaine enters the water, including illegal drug labs, excrement from drug users, or cocaine lost at sea.

The presence of these substances in aquatic environments has been previously documented in drainage systems and rivers, CBS News has reported.

The impact of cocaine on sharks and other wildlife remains unclear, especially concerning pregnant sharks and their fetuses.

Marine eco-toxicologist Sara Novais emphasized the importance and potential concern of these findings.

Past studies and shows, like Discovery TV’s “Cocaine Sharks,” have explored the effects of illicit drugs on sea life, highlighting the need for more research.

Environmental engineer Tracy Fanara noted the importance of understanding the broader impact of chemicals on aquatic life and, ultimately, on humans.

Written by B.C. Begley