Chemicals Likely Cause of Feminization of Canadian Fish

GreenTracker| Chemicals present in two Canadian rivers are the likely cause of the feminization of fish. Compounds detected in the water included synthetic estrogens (birth control pill compounds and hormone therapy drugs); bisphenol A, a chemical used in making plastics; and certain types of natural and synthetic steroids that are byproducts of agricultural run-off and cattle farming. via Science Daily

At 14 out of 15 locations, males showed elevated levels of a protein, hepatic vitellogenin, which is normally only found in the blood of females and is used by females to produce eggs.