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Vicki Blazer of the U.S. Geological Survey leads a field survey of smallmouth bass from the Shenandoah River in Front Royal, Va., on Sept. 29, 2014. Blazer's team has observed the effects of pesticides, pharmaceuticals or other chemicals that disrupt the hormonal systems of smallmouth bass and lead to the presence of oocytes, or eggs, in male specimen's gonads. (Photo by Will Parson/Chesapeake Bay Program)
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© Will Parson
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Vicki Blazer of the U.S. Geological Survey leads a field survey of smallmouth bass from the Shenandoah River in Front Royal, Va., on Sept. 29, 2014. Blazer's team has observed the effects of pesticides, pharmaceuticals or other chemicals that disrupt the hormonal systems of smallmouth bass and lead to the presence of oocytes, or eggs, in male specimen's gonads. (Photo by Will Parson/Chesapeake Bay Program)