A little stickleback fish (Gasterosteus aculeatus) nicknamed "Mary" appears to have leaped across a major reproductive divide on the evolutionary tree of life. Stickleback females, like most female ...

Among pregnant women at high risk of preterm birth, those who eat fish a few times a week may be less likely to deliver early, a new study finds. Whether fish itself helps prevent preterm delivery is ...

Male fish are turning into females thanks to chemicals from birth control pills and makeup being flushed down drains, according to a new study. The study of freshwater fish in Britain found a fifth of ...

Add Yahoo as a preferred source to see more of our stories on Google. The fish swimming in the streams, rivers, and lakes around your town are probably on Prozac. Now new research from the U.S.