All the birth control pills and female hormone pills end up polluting the rivers and turn some of the male fish into weird fish.  


"WASHINGTON—Government scientists figure that one out of five male black bass in American river basins have egg cells growing inside their sɛҳuąƖ 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."

http://www.usnews.com/science/articles/2009/09/15/male-bass-in-many-us-rivers-feminized-study-finds