Oxygen deprivation tampers with sex hormones in fish and impairs reproduction, according to new research. The results suggest that low oxygen in freshwater ecosystems can disrupt animals’ endocrine ...

When a young tomato anemonefish (a cousin to the famous Nemo) arrives at a new home, it carries extra white stripes. These ...

Endocrine disrupting chemicals are known to cause physiological and behavioral abnormalities in fish. It's a man's world for fish in a San Francisco Bay-Delta estuary. Silverside fish collected from ...

Hormones that leak into streams from cattle feedlots are altering the sexual characteristics of wild fish, demasculinizing the males and defeminizing the females, according to a newly released study.

Take a fish out of water and its stress hormones will go up. Adrenaline and noradrenaline, the 'fight or flight' hormones, peak first, followed more gradually by cortisol. A new study finds that ...

LANSING — Sex hormones might be the secret for lowering mercury levels in fish and maybe humans, researchers say. States often issue consumption limits in areas with high concentrations of mercury in ...

A sewage treatment plant in Canada has figured out a way to reduce the levels of chemicals that stick around in the treated wastewater, according to a new study. These include chemicals that have ...

Empty nets and few species – environmental hormones are believed responsible for the diminishing numbers of fish. How damaging are these substances really, though? Studies that depict a complete ...

A male fish produces a burst of hormones as he fights off an intruder. Now, researchers say that this surge isn’t triggered simply by fighting. “Apparently, the fish need to know whether they are ...