Quote:WASHINGTON - Government scientists figure that one out of five male black bass in American river basins have egg cells growing inside their sexual organs, a sign of how widespread fish feminizing has become.

The findings come from the U.S. Geological Survey in its first comprehensive examination of intersex fish in America, a problem linked to women's birth control pills and other hormone treatments that seep into rivers. Sporadic reports of feminized fish have been reported for a few years.

The agency looked at past data from nine river basins, which cover about two-thirds of the United States — and found that about 6 percent of the nearly 1,500 male fish had a bit of female in them. The study looked at 16 different species, with most not affected.

The fish most feminized are two of the most sought-after freshwater sport fish: the largemouth and smallmouth, which are part of the black bass family. Those two species also were the most examined, with nearly 500 black bass tallied.

"It's widespread," said USGS biologist Jo Ellen Hinck. She is the lead author of the study, published online this month in Aquatic Toxicology. She said 44 percent of the sites where black bass were tested had at least one male with egg cells growing inside.

Past studies have linked the problem to endocrine-disrupting hormones, such as estrogen from women's medicines. While the fish still can reproduce, studies have shown they do not reproduce as well, Hinck said.

Intersex fish also are seen as a general warning about what some experts see as a wider problem of endocrine disruptors in the environment.

The egg cells growing in the male fish's gonads can be seen only with a microscope after the fish has been caught and dissected.

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