"The blob" is responsible for an unprecedented seabird die-off from California to Alaska in 2015 and 2016, say researchers who studied the common murres.

Fishing practices that selectively remove large parrotfish could put corals at risk, researchers warn.

Fossils of ancient fish are giving resarchers a clearer picture of the time of transition from fish fins to limbs fit for walking on land.

Humpback whales attack their prey about as fast as humans jog. So how are they so good at catching tiny, speedy fish? Stealth and deception.

Fish swimming in schools use less energy and move faster than those that swim alone. But school shape matters, too.

The loss of genetic diversity will make it harder for plant and animal populations to adapt to changing environments. Fish and insects may be most at risk.

"The new teeth wear the old ones as 'hats' until they are ready to erupt. So, piranhas are never toothless..."

New research finds that reef fish populations depend on two things: good hiding spots and a resident predator.

Having some of the most nutritious fish in the world nearby doesn't save millions of people, particularly children, from malnutrition.

Robotic fish may help control one of the world's most problematic invasive species by mimicking their natural predators.