http://www.npr.org/templates/story/story.php?storyId=112888785 Study: Gender-Bending Fish Widespread In U.S.
by Christopher Joyce
September 16, 2009
A survey of fish in rivers and streams around the country shows that a large percentage of male bass have acquired feminine characteristics.
Scientists say it's the biggest survey of this gender-bending condition in U.S. waters. And while they can't be sure of the cause, they suspect industrial and pharmaceutical chemicals are the culprit.
Jo Ellen Hinck of the U.S. Geological Survey spent nine years catching fish to see if there was anything strange about their gender. Gender changes in male fish are not new, but its cause has puzzled scientists.
"Our work is really the first to show the widespread occurrence of intersex in fish across the United States," Hinck says. "Intersex" in this case means a male fish having immature egg cells growing in its testes.
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