The sea lamprey looks like it’s from another planet, but this ancient creature has a surprising amount in common with humans ...

Scientists have unearthed a fossilized fish that was once the biggest vertebrate of its day. The predatory sea creature, dubbed Megamastax amblyodus, which means "big mouth, blunt teeth," prowled the ...

Scientists in Australia have unearthed beautifully preserved fossilized hearts and other internal organs of ancient armored fish in a discovery that provides insight into the evolution of the bodies ...

Cold-water streams have experienced disproportionate impacts, experiencing more than a 50% decrease in fish abundance over the last three decades, according to a study published Wednesday in Nature.

The same regulatory landscape which influences the development of fingers is present in fish, despite their distinct lack of digits. When researchers used CRISPR (a common gene editing tool) to fiddle ...

The composition of fish populations in streams and rivers across the U.S. have been severely altered as a result of changing ...

Documenting fish noises isn’t exactly easy. The underwater creatures aren’t as loud as birds or whales; they also make noises ...

A mass extinction of fish 360 million years ago hit the reset button on Earth’s life, setting the stage for modern vertebrate biodiversity. The mass extinction scrambled the species pool near the time ...

It is one of several new finds that could rewrite how scientists understand fish evolution. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Did you know there are more than 500 species of sharks out there in the world? These fascinating underwater creatures have been swimming in our seas for about 455 million years, and they can travel ...

A lamprey suckles the side of its tank in Spain in 2015. Photo: Miguel Riopa/AFP (Getty Images) Derpy from the side and hellish from below, the lamprey is the bane of the Great Lakes fisheries ...