Up to 85% born male are now female. Chemicals, like contraceptives, dumped in water to blame?
These substances throw off functions that regulate hormones and the reproductive system, said USGS biologist Vicki Blazer, a co-author of the latest study and lead author of numerous earlier reports. At one polluted site Blazer examined in the Susquehanna River near Hershey, Pa., two years ago, 100 percent of the male smallmouth bass sampled had eggs.
These substances throw off functions that regulate hormones and the reproductive system, said USGS biologist Vicki Blazer, a co-author of the latest study and lead author of numerous earlier reports. At one polluted site Blazer examined in the Susquehanna River near Hershey, Pa., two years ago, 100 percent of the male smallmouth bass sampled had eggs.