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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.
The lemon shark isn't as aggressive as some other sharks and it isn't quite as yellow as its name suggests.
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."
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.
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.
Piranhas are some of the most feared fish in the world, but is their reputation for ferocity a bit overblown?
They're swimming in water all day so how could they ever get thirsty? The answer might surprise you.
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 colorful superstars of backyard water gardens are actually ornamental varietals of domesticated carp.
It's one of the gentle giants of the sea. It loves sunbathing, dining on crabs and taking deep dives to the ocean floor.
The blobfish is actually pretty average looking in its normal habitat.
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.
Commercial fisheries accidentally kill around 100 million — yes, 100 million — sharks each year. The solution to this problem might lie in magnets.
A new study seems to suggest that sharks prefer jazz to classical music but the researchers set us straight.
Cuttlefish can avoid detection by holding a disguise for long periods of time.
The Gulf corvina is the loudest fish on the planet, helping lead to its overfishing and endangerment.
Scientists have long known that much of the world's farmed salmon was deaf. Now they know why.
Scientists have known for a long time that goldfish make their own alcohol. Now, they've just discovered how they do it.
Michael Phelps is racing a shark for TV glory. But does he have a fighting (or swimming) chance?
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.
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