Bahamian Sharks Test Positive for Cocaine & Painkillers in New Study

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Fish in the Bahamas are unexpectedly having a spring break experience, whether they like it or not.

A recent study published in the May 2026 issue of Environmental Pollution revealed that sharks living near a remote tropical island have traces of cocaine, caffeine, and various drugs in their systems.

A study called “Drugs in Paradise” examined 85 sharks from five different species and found that 28 of them—including Caribbean reef, nurse, and lemon sharks—had traces of drugs like cocaine, caffeine, acetaminophen (found in Tylenol), and the pain reliever diclofenac in their blood.

This is the first documented instance of caffeine and acetaminophen being found in any shark species globally. Researchers also report the first detection of diclofenac and cocaine in sharks inhabiting the Bahamas, a region generally considered to be a clean and healthy environment.

The research suggests these changes were made worse by the fast pace of building along the coast. With more tourists and vacation homes being built, and tourism being so important to the economy, this development likely played a significant role.

The researchers believe these changes probably happened because of the amount and chemical makeup of local sewage, combined with sharks living a long time and spending much of their lives in coastal areas affected by human activity.

As a long-time observer of these fish, I’ve been really concerned about the impact of the contamination. The recent data confirms my worries – fish with contaminated blood are showing changes in their biology, and it’s actually affecting how they behave. It’s pretty clear the pollution is disrupting their natural instincts and patterns.

Researchers aren’t certain if these compounds will harm animals, but lead author Natascha Wosnick explained to CBS News that long-term exposure could cause problems. This is because many of these compounds don’t have anything similar naturally occurring in the ocean.

While the presence of cocaine is shocking, she stressed that any substance found in the sharks is a cause for worry.

Although finding cocaine in sharks gets a lot of attention, the zoologist pointed out that it’s just as concerning to find common substances like caffeine and various drugs present in the blood of many sharks.

She and her team aren’t worried about sharks becoming more dangerous to people. As Wosnick explains, their main focus is on how these changes might affect the health and overall well-being of shark populations themselves.

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2026-04-06 21:47