Fish

With over 32,000 described fish species, the varieties are endless. Most bony fishes are cold-blooded, covered in scales and breathe using gills—but there are exceptions to all of these rules.  

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In the spring of 2011, a research crew from Oceana spent two months in the brackish Baltic Sea . The Baltic faces challenges from pollution, algae blooms, over fishing, and invasive species. Oceana researchers...
Boats Connect Us to the Ocean More than any other objects, boats symbolize...
CREDIT: Wikimedia User “Fisherman” Because of consumer demand for sashimi (a...
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Have you ever seen a creature so unusual? This fish (22 cm long) is called a...

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The Pacific hagfish ( Eptatretus stoutii ), a fish that looks similar to an eel, has no jaw and is totally blind. They find food, often dead fish, through a specialized sense of smell and, because they can absorb nutrients...
By diving in the Curasub, Smithsonian researchers with the Deep Reef...
Frogfish are skilled hunters and some species are capable of blending into...

DIVE DEEPER

Scientists in the Division of Fishes at the Smithsonian's National Museum of Natural History use X-ray imaging to study the...
This guineafowl moray ( Gymnothorax meleagris ) is one of about 200 species of moray eels found in tropical and subtropical coral reefs . Moray eels are a type of bony fish. Many species, like this...
Beneath the sun shining through the Red Sea onto a hill of coral, butterfly fish ( Chaetodon lunula ), and angelfish swim together. The two fish can be confused for each other, but are distinguished...
This lanternfish ( Diaphus sp .), found in the Red Sea, has light-producing photophores along its ventral surface (belly), and a nasal light organ that acts like a headlight. Hear scientists tell...
The longsnout seahorse ( Hippocampus reidi ) can be found near seagrasses, corals, sargassum and mangroves . These seahorses usually are between three to seven inches tall and could be threatened...
Can painted wooden fish on a schoolyard fence change human behavior and help clean up the ocean for the real salmon? Stream of Dreams in British Columbia thinks so, and a lot of wooden fish and some...
This rarely-seen smalleyed rabbitfish ( Hydrolagus affinis ), belonging to the order of Chimaera, was caught during a research trip to the Mid-Atlantic Ridge in 2004 sponsored by the Census of Marine...
A beautiful cut of Atlantic salmon ( Salmo salar ), a popular species among seafood lovers that is in severe decline. Check out our guest blog pos t by Oceana's Emily Fisher on the explosion of...
Cardinalfish ( Cheilodipterus sp. ) dads do their part to protect their eggs by gingerly carrying them in their mouths. However, the dads could easily swallow the whole bunch in one gulp! To keep her...
Two bright orange anemonefish ( Amphiprion ocellaris ) poke their heads between anemone tentacles. Anemonefish are able to swim amongst the stinging tentacles without getting stung — but no one knows...
The long toothy rostrum or “saw” gives sawfish their common name. They use the saw to dig in the sand for crustaceans or to attack prey by vigorously slashing from side to side. This smalltooth...
Editor's Note: See more information and details about the organisms displayed in the slideshow here . Researchers who come to Curaçao to take part in DROP ( Deep Reef Observation Project ) aren’t...
Tropical hatchetfish ( Argyropelecus lychnus ), like the one shown in this X-ray photograph, live in the dark depths of the ocean ; this specimen was collected at about 2,789 feet (850 meters) in the...
"This fish was extremely curious of my Sola modeling light. It continued to come up close to the camera. Location: Green Beach, Okinawa, Japan. Depth: 40ft on a day dive," wrote Shawn Miller of his...
Fish spears and fish weirs—fish traps placed in rivers—are traditional ways of catching salmon on rivers. More about raven spirit can be found in our Raven Spirit featured story.
The Palauan primitive cave eel ( Protanguilla palau ) has an evolutionary history that dates back some 200 million years . Because of this and the fact that it has retained some primitive features,...
A rockfish finds refuge in a deep-sea coral—a red tree coral of the Primnoidae family in the Olympic Coast National Marine Sanctuary. Learn more about deep-sea coral reef ecosystems in our Deep-sea...
A year in the waiting! During the summer of 2011, DROP researchers almost caught a sea toad off of Curaçao . However, when the sub crew tried to collect the sea toad with the sub's suction tube, the...
If youngsters get cared for at all, the mother is usually involved. But in fish and a few other groups where eggs are not abandoned, fathers are the primary care providers. Males are sometimes such...
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