Saltwater Fish

If you're into marine oddities, few animals capture the imagination quite like the hairy frogfish. This bizarre, underwater ambush predator may look like a ball of algae, but don't be fooled: It's a master of camouflage and a nightmare for unsuspecting prey.

By Nicole Antonio

The barreleye fish (Macropinna microstoma) is known for its strange eyes and transparent dome for a head head — features that make it look more like a creature from science fiction than reality.

By Mack Hayden

The deep-sea dragonfish is one of the most mysterious and fearsome creatures lurking in the ocean's depths. Known as a top predator in the deep sea, this fish has evolved incredible adaptations to survive in underwater areas that have never known so much as a glimpse of sunlight.

By Mack Hayden

The stonefish might look like just another rock on the ocean floor, but don't let that fool you; it holds the title of the most venomous fish in the world. If you're not careful, a step on this camouflaged critter could lead to some serious consequences.

By Zach Taras

As land-dwelling humans, the ocean can be both fascinating and a little (or a lot) frightening. It's therefore not all that surprising that an appearance of the large, strange-looking oarfish might make people anxious, especially in our social-media addled age.

By Zach Taras

While there are tons of fish in the sea, only a few hold the title of the fastest fish in the ocean. You might wonder how the fastest fish swim at such high speeds.

By Clarissa Mitton

The sheepshead fish is a curiosity to anglers and marine biologists alike. This unique species, found along the Atlantic coast of North America, has long received attention for its strange dental structure, resembling that of humans.

By Katherine Millar

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.

By Jesslyn Shields

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?

By Allison Troutner & Mack Hayden

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 & Talon Homer

The swordfish's nose might look crazy weird, but these gladiators of the sea are perfectly outfitted for ocean battle.

By Jesslyn Shields

Humuhumunukunukuapua'a, the colorful little fish with the craaaaazy long name, is Hawaii's state fish, but it wasn't always.

By Jesslyn Shields

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.

By Jesslyn Shields & Talon Homer

The Gulf corvina is the loudest fish on the planet, helping lead to its overfishing and endangerment.

By Jesslyn Shields

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!

By Kate Kershner

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?

By Cristen Conger

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