Animals
Crucian Carp
This freshwater fish can survive being frozen solid, reshape its own body to outwit predators, and outlive most household pets…
Animals
Animals
Danio
Danios make a popular choice for aquarium hobbyists due to their hardy nature. Danios come in many types and colors,…
Animals
Freshwater Jellyfish
Many people might be shocked to learn that the tiny, harmless Craspedacusta sowerbyi, a hydromedusan jellyfish, is the most commonly…
Animals
Wels Catfish
It haunts the murky bottoms of European rivers, grows large enough to swallow a duck whole, and thrives in the…
Animals
Boxfish
It’s easy to see how a boxfish got its name. Its body is shaped like a small box! These are…
Animals
Ribbon Eel
Born male, capable of switching sexes, and dressed in colors that shift from jet black to vivid blue, this reef-dwelling…
Animals
Lake Sturgeon
Also called the rock sturgeon, this strange-looking, laid-back, long-lived fish hasn’t changed much since the Pleistocene epoch. Its body sports…
Animals
Telescopefishes (Giganturids)
Living deep below the surface and away from natural light, these fish live in dark waters. To compensate, Mother Nature…
Animals
Goldfish
People started breeding goldfish of different colors in China 1,000 years ago. Only members of the imperial Song dynasty were…
Animals
Discus
Symphysodon, also known as discus, is a genus of brightly colored tropical fish (and a member of the cichlid family).…
Animals
Oyster Toadfish
The oyster toadfish is a strange-looking (some may even say ugly) fish that makes its home in the secluded holes…
Animals
Oscar Fish
People who own Oscar fish might have bought one or two for their beautiful colors, but soon they’re surprised to…
Animals
Flowerhorn Fish
The Flowerhorn fish, also known as the Flowerhorn cichlid, is an artificial creation of human breeders, thought to originate from…
Animals
Hardhead Catfish
A father that refuses to eat for a month while sheltering his young in his mouth, armed with venom-laced spines…
Animals
Squirrelfish
These nocturnal reef hunters communicate through vibrating swim bladders, carry venomous spines, and share a name with a famous Chinese…
Animals
Reef Shark
Caribbean reef sharks can turn their stomachs inside out, grey reef sharks perform a dramatic threat display reserved only for…
Animals
Frogfish
Lurking motionless on the seafloor, this bizarre ambush predator can swallow prey larger than itself in mere milliseconds, and that…
Animals
Koi Fish
Collectors have paid nearly two million dollars for a single fish, and one legendary specimen lived long enough to be…
Articles
Are Fish Mammals? Exploring the Diverse Classes of Fish
Are fish mammals? Fish are not mammals, but they are such a diverse group that putting all of them into…
Animals
Anglerfish
Lurking in total darkness more than a mile beneath the ocean surface, this bizarre predator evolved tricks so strange they…
Animals
Crappie Fish
North America's favorite panfish hides a set of surprising secrets beneath those silvery scales, from a built-in extra lens that…
Animals
Mekong Giant Catfish
Once revered in Buddhist temples and feared for its sheer size, the world's largest purely freshwater fish now teeters on…
Animals
Porbeagle Shark
Named for its beagle-like endurance and relentless pursuit of prey, this high-speed ocean predator faces a biological bottleneck so severe…
Animals
Haddock
Few fish carry as much mystery and cultural weight as this deep-sea dweller, marked by a legendary thumbprint and fueling…
Animals
Walking Catfish
It breathes air, smells with its whole body, and has no problem abandoning the water entirely to find a better…
Animals
Sixgill shark
Ancient beyond reckoning and still prowling the ocean depths today, these six-gilled predators have barely changed in 200 million years.…
Animals
Garden Eel
These eels spend their lives with at least their tail in the sand at all times. The full body is…
Animals
Spinner Shark
Few ocean predators have mastered a hunting technique as bizarre and breathtaking as this sleek requiem shark, which spins and…
Animals
Bonnethead Shark
With a crescent-shaped head unlike any other shark on Earth, this small coastal predator hides some genuinely strange secrets, including…
Animals
Sleeper Shark
Lurking in the deepest, coldest ocean waters, these ancient predators have mastered survival strategies that have puzzled scientists for decades,…
Fish
The Incredible Diversity of the Ocean’s Longest Fish Species
Have you ever wondered what the longest fish in the world are? There are approximately 34,000 species of fish in…
Animals
Sand Tiger Shark
It lurks with cold eyes and a jaw full of jagged teeth, yet that terrifying appearance hides a surprisingly peaceable…
Animals
Blue Shark
Slender and beautiful in the way that a shark can be beautiful, the blue shark is found in all the…
Animals
Cookiecutter Shark
A shark barely longer than your forearm has left its distinctive circular scars on creatures as massive as great white…
Animals
Salmon Shark
The Salmon shark is sometimes called “Pacific Porbeagle” because its appearance is almost indistinguishable from the porbeagle species. In fact,…
Animals
Greenland Shark
The Greenland shark, called eqalussuaq by the Inuit people, is famous for living to a great age. Biologists believe that…
Animals
Flying Fish
Some fish flee predators by diving deeper or hiding, but one remarkable species escapes by vanishing into the sky entirely.…
Animals
Longnose Gar
The Longnose gar are greyish to olive in color. The color, however, fades into white along the sides of the…
Animals
Banjo Catfish
It looks exactly like a piece of waterlogged bark, stays perfectly still for hours, and has thrived in the Amazon's…
Animals
Spotted Gar
The spotted gar can be found in calm pools located in freshwater rivers, ponds, and creeks. It is one of…
Pet Fish
Keeping fish as pets is a popular choice for many people. If you don’t have a lot of space or…
Animals
Florida Gar
The Florida gar is among the most ancient and unique freshwater fish of North America. It is not necessarily the…
Animals
Alligator Gar
Hunted nearly to extinction over a lie, this armored giant of North American rivers carries a surprise that has ended…
Animals
Chinese Paddlefish
Once one of the largest freshwater predators on Earth, this ancient river giant patrolled the Yangtze for millions of years…
Animals
Albacore Tuna
It fuels a third of the world's canned tuna market, yet most people have no idea what a longfin tuna…
Animals
Bluefin Tuna
Once the undisputed kings of the open ocean, bluefin tuna now face a precarious fight for survival that pits the…
Animals
Yellowfin Tuna
Starting life nearly invisible to the naked eye, this oceanic predator transforms into a 50 mph torpedo that schools alongside…
Animals
Skipjack Tuna
That can of tuna sitting in your pantry likely came from one of the ocean's most fascinating yet overlooked fish,…
Animals
Tuna
Beloved by millions of people as a culinary delight for its rich, succulent taste, the mighty tuna fish roams the…
Fish: Different Types, Definitions, Photos, and More
Fish are aquatic vertebrates. They usually have gills, paired fins, a long body covered with scales, and tend to be…