Numerous types of fish exist worldwide and come in all shapes and sizes. The X-ray fish is one unique breed found in the South American region. This breed has other names like water goldfinch ...

Although scientists don't know why these gigantic fish jump, they've at least measured how high: some of the most spectacular jumps can reach over 6.5 feet above the surface. And it's not just ...

They are the most extraordinary of fish, resembling "hedge trimmers with fins". The sawfish, which is a kind of ray, is also among the most endangered of the fish living in the oceans. Once found ...

Smithsonian National Museum of Natural History fish curator Sandra Raredon captured the images of thousands of fish specimens. All up, the institution, in Washington DC, has four million individual ...