A coelacanth, known by some as the "dinosaur fish," was spotted in eastern Indonesia in a rare sighting of a species once ...

"Discus don't cost thousands of dollars ... The African Basslet is an ultra-rare fish, which means its price can change ...

With about 130 remaining on Earth, the Devils Hole pupfish is the world's rarest fish. Scientists believe the fish has lived in relative isolation just outside of Nevada's Death Valley for about ...

But perhaps its most famous occupant is one that keeps fighting against all odds: the Devils Hole pupfish, a tiny endangered vertebrate that also happens to be the rarest fish on the planet.