Existence of second Arapaima species established in rare monograph

Scientists have decoded the DNA of a celebrated "living fossil" fish, gaining new insights into how today's mammals, amphibians, reptiles and birds evolved from a fish ancestor.

French Marine biologist Laurent Ballesta embarks on a 40-day expedition to study the enigmatic coelacanth.

How do how salmon navigate across thousands of miles of open ocean? A new study may offer a clue to the fishes' homing strategy

As clownfish move around at night, they boost water flow over the anemone and increase its oxygen consumption.

European perch exposed to oxazepam, a drug commonly used to treat anxiety disorders in humans, is likely to behave in an antisocial manner

Tagged eels help scientists understand migration

Siamese fighting fish gulp air to prolong bouts.

Big fish that have grown up in marine reserves don’t seem to know enough to avoid fishers armed with spear guns waiting outside the reserve.

NOAA’s National Centers for Coastal Ocean Science and its partners publish first ever guidelines for coastal managers to control the spread of invasive lionfish.