Fish are an incredibly diverse group of animals. Read these articles to find out about all kinds of unique and different fish.
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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
This denizen of the frigid deep not only lives a crazy long life, it also can grow up to 24 feet in length and eating its flesh can make humans "shark drunk."
By Katie Carman
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.
The snakehead fish can breathe air, double its population in 15 months and has a huge appetite, which is not a good thing for native species.
Humuhumunukunukuapua'a, the colorful little fish with the craaaaazy long name, is Hawaii's state fish, but it wasn't always.
The basking shark, an endangered species, may look like a fearsome predator, but is actually a filter-feeder, gathering zooplankton and other tiny animals, such as shrimp, in bulk as it roams the seas with a wide open mouth.
By Mark Mancini
The prehistoric looking alligator gar is sometimes referred to as a "living fossil" and, while they may look threatening, are harmless to anything larger than themselves.
The blobfish is actually pretty average looking in its normal habitat.
Commercial fisheries accidentally kill around 100 million — yes, 100 million — sharks each year. The solution to this problem might lie in magnets.
Cuttlefish can avoid detection by holding a disguise for long periods of time.
By Amanda Onion
Scientists have long known that much of the world's farmed salmon was deaf. Now they know why.
By Alia Hoyt
Shark shocker! This 'virgin birth' is the first example of a shark switching from sexual to asexual reproduction.
Never mind the penis on its head, this weird ghost shark was filmed live for the first time, and hanging out in the wrong hemisphere.