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Intersex fish discovered in 3 Pennsylvania river basins

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Male fish carrying eggs — intersex fish — have been found in Pennsylvania’s Susquehanna, Delaware and Ohio river basins, a sign that the water may be tainted with chemicals, according to the U.S. Geological Survey.

The research found that two fish species, smallmouth bass and white sucker, were exhibiting the effects of exposure to endocrine-disrupting chemicals. Intersex characteristics caused by hormones and hormone-mimicking compounds include immature eggs in male fish, the USGS said.

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