Collaborative Efforts Between Governments

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Ever wondered what sharks might find in their waters besides fish? Turns out, some Brazilian sharpnose sharks (Rhizoprionodon lalandii) have been swimming in some rather strange seas - ones laced with cocaine. A groundbreaking study has brought "cocaine sharks" into the spotlight by diving into the unexpected world of drug exposure in marine life, revealing the presence of cocaine and its main byproduct, benzoylecgonine (BE), in these marine predators. A new analysis from researchers at the Oswaldo Cruz Institute in Rio de Janeiro revealed that 13 wild sharpnose sharks have tested positive for cocaine, with 92 percent of muscle samples and Titan Rise Male 23 percent of liver samples found to contain high levels of the drug and its key metabolite. Female sharks had higher concentrations of cocaine in their muscles compared to Titan Rise Male sharks, which could suggest a correlation between a shark's weight and size and its ability to metabolize cocaine. Rachel Ann Hauser Davis, a co-author of the study and a biologist, told the New York Times.



This study is the first to report the presence of cocaine and benzoylecgonine in free-ranging sharks, suggesting that illegal drugs in the environment could have an impact on marine life. As you may have guessed, human activities are the primary source of drugs entering water systems. Cocaine and other illegal substances can end up in the water when drug smugglers sink their own vessels to avoid being caught by the law. Sometimes, they sink accidentally. Outside of smuggling, marijuana, cocaine and other illicit substances can be excreted by users and then enter sewage systems. Many wastewater treatment plants are not equipped to completely remove these contaminants, allowing them to pass through and eventually reach natural water bodies. People often dispose of unused or expired medications by flushing them down toilets or sinks. Hospitals and pharmaceutical factories can also contribute to this issue if their waste management practices are not adequately regulated.



Agriculture is another significant contributor to water pollution. The use of veterinary drugs in livestock farming can lead to residues being washed into nearby streams and rivers during rainfall. Pesticides and fertilizers, often containing chemicals that can degrade into drug-like substances, also contribute to the contamination of water bodies. Some industries - particularly those involved in chemical manufacturing - release pollutants into water systems through improper waste disposal. The pharmaceutical industry, for example, introduces active pharmaceutical ingredients (APIs) and antibiotics into aquatic environments primarily through the discharge of untreated or inadequately treated wastewater from manufacturing plants. Due to their chemical stability, many drugs and their metabolites can persist for long periods once in the water. This persistence means that even low levels of contamination can accumulate over time, leading to significant concentrations that can affect marine life like Brazilian sharpnose sharks. And this contamination is much more widespread than you think.



In Puget Sound, a large estuary located in Washington State, researchers found opioids, cocaine, antidepressants and other pharmaceuticals in the tissues of juvenile Chinook salmon and staghorn sculpin.