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Associated Press
This Jan. 28, 2013 photo provided by Umea University shows Dr. Tomas Brodin holding a fish net at a lab in the university in Umea, Sweden. Brodin and his colleagues have dosed wild perch with amounts of an anxiety-moderating drug Oxazepam equivalent to those found in Sweden’s rivers and streams, and their results suggest that even small amounts of the drug can alter the behavior and foraging rates of these fish. (AP Photo/Umea University, Johan Gunseus)

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