Saltwater fish are the most beautiful fish in the world. They range from the majestic marlin to the funny-looking flounder, and the goliath grouper to the tiny blenny, and just about everything in between.
Unlike most species on Earth, the male seahorse, rather than the female, does the gestating and delivery. And he does it in his own unique way, a new study found.
It's hard to imagine Nemo catching some z's in the Great Barrier Reef. But fish do need rest. Do they sleep like we do?
The elusive hagfish is a master at hiding in holes and crevices, but its main defense is its ability to release a noxious, suffocating and sometimes poisonous slime when attacked.
By Mark Mancini
The showy lionfish is a stunning beauty. But this invasive species, which was released into the wild in the 1980s, is wreaking havoc on delicate reef ecosystems worldwide.
By Wendy Bowman
Most species of the rarely seen anglerfish live up to a mile beneath the ocean, where the females lure prey with a head-dangling hook appendage and permanently fuse with male suitors. It doesn't get much stranger than that.
By Katie Carman
The swordfish's nose might look crazy weird, but these gladiators of the sea are perfectly outfitted for ocean battle.
Humuhumunukunukuapua'a, the colorful little fish with the craaaaazy long name, is Hawaii's state fish, but it wasn't always.
It's one of the gentle giants of the sea. It loves sunbathing, dining on crabs and taking deep dives to the ocean floor.
By Mark Mancini
The blobfish is actually pretty average looking in its normal habitat, but becomes a blob when it transitions from the pressure at depth to the water's surface.
The cleaner wrasse fish passed the mirror test, which is considered the gold standard for determining self-awareness.
Scientific divers from the California Academy of Sciences discover new species of dazzling, neon-colored fish.
Cuttlefish can avoid detection by holding a disguise for long periods of time.
By Amanda Onion
The Gulf corvina is the loudest fish on the planet, helping lead to its overfishing and endangerment.
Scientists have discovered a few enterprising catfish that are having a fancy feast — of mice.
Could the sequel to Disney's 'Finding Nemo' increase demand for pet s and bring the decline of the exotic fish that plays the leading role?
By Chris Opfer
King of the herrings! What regal creature would have such a majestic history? It's the giant oarfish, and it's surfaced everywhere from sailors' nightmares to Southern Cali. Meet the longest bony fish ever!
With its flexible, slim body, the barracuda is particularly adapted to swimming among coral reefs, which requires intricate moves through tight turns. Meet the barracuda! View pictures, watch video, read facts, explore interactives and more.
Unlike land snakes, eels are usually scaleless is although a few species can be found with tiny scales along their bodies. Meet the eel! View pictures, watch video, read facts, explore interactives and more.
Oooooh, barracuda! It's not just a Heart song -- it's also a dinner dish. But should you be as suspicious of this creature on your plate as scuba divers are of encountering it in the water?
A flying fish is a fish with large fins that help it to glide through the air. Most flying fish live in tropical and subtropical areas of the ocean.
World-famous 'Crocodile Hunter' Steve Irwin, died on Sept. 4, 2006, in a shocking accident with a stingray. But stingray-related fatalities are almost unheard of, so what happened? Find out.
By Julia Layton