University of Calgary professors have found that hormone-altering chemicals in rivers, such as synthetic estrogens and agricultural by-products, are changing the sexes of a small species of minnow. One of the researchers asserted "I think we need to look at this a little more carefully and ask, what is the message the fish are telling us. If the fish are showing bent genders and people are drinking the same water . . . we need to try to evaluate that risk.”
(30 Jul 2010)