Deep-sea fish adapt to some of the most extreme conditions on Earth. New research analyzing their evolution finds the same mutation across fish species that have evolved on separate timelines — ...

It's not every day a terrifying beast from the darkest depths of the ocean just washes up ashore. Yet that's what the ...

These are the prettiest freshwater fish, from vibrant brook trout and pumpkinseed sunfish to majestic lake sturgeon. Check out how these species made our list!

The lancetfish, which is normally found in deep-sea areas, has been called the "Twilight zone fish" and intact specimens are ...

A longnose lancetfish washed ashore in a rare appearance in Seaside, Oregon. Seaside Aquarium staff examined the 5-foot-long ...

The firework jellyfish is rarely seen by humans, but its bioluminescence could put any July 4th show to shame.

When told about a strange, fanged fish that had washed ashore on an Oregon beach, the Seaside Aquarium folks knew what kind of fish it was.

The National Zoological Garden in Pretoria has welcomed three blacktip reef sharks and 220 marine fish, enhancing its ...