If the image of wild European Perch strung out on anti-anxiety meds doesn't make you want to run out and become a hardcore environmental activist — right now — nothing will.

Indeed, according to this new report out of Sweden, pharmaceutical drugs that "end up in the world's waterways after being excreted, flushed and treated at wastewater treatment plants may lead to unexpected ecological impacts over time."

Those "unexpected impacts" include fish whose behavior can be transformed by these drugs: in this case the perch grew more gluttonous, risk-taking, bold, aggressive and antisocial, researchers report.

Here's more from the news release; the study is just out today in the journal Science: