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Bioluminescence is one of the more captivating adaptations that have evolved in marine animals. It's the ability of organisms to create and emit light. Dive underwater and you may witness lightshows of red, green,...
Scientists describe the amazing bioluminescent creatures they encounter as they...
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The open ocean is surprisingly barren to the naked eye. Every now and again you...
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Everyone knows what a fish is: from a pet goldfish to a wild sunfish, fish are...

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A candy basslet ( Liopropoma carmabi ) was just one of the specimens Smithsonian scientists collected from the deep reefs of Curaçao , in the southern Caribbean. To study biodiversity far below the water's surface, the...
Two bright orange anemonefish ( Amphiprion ocellaris ) poke their heads...
The pearly razorfish’s name may be slightly misleading since it is neither...

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By Lindsay Aylesworth, Project Seahorse The day I stepped into my wetsuit, donned my mask, and embarked on my first scuba...
Whalefish mystery solved! The tapetail is the larva of the family. It transforms into either a male (bignose) or female whalefish. The family name is Cetomimidae .
These beautiful mandarinfish ( Synchiropus splendidus ) are covered in bright blue, red, yellow and orange waves. What they lack, however, are traditional fish scales. They live in western Pacific...
You may have seen the sparkle of fireflies on a summer’s night. The fireflies produce light through a chemical reaction in their glowing abdomens, a process known as bioluminescence. But did you know...
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.
In the early 1990s, the annual commercial harvest of Atlantic bluefin tuna doubled, reaching a peak of 25 kilograms (55 million pounds). More about sustainable seafood can be found in our Sustainable...
The deep-sea dragonfish ( Stomiidae ), also called the barbeled dragonfish, uses it's fang-like teeth to grab prey in its deep-sea environment . Like other deep-sea organisms, dragonfish have...
Bioluminescence is one of the more captivating adaptations that have evolved in marine animals. It's the ability of organisms to create and emit light. Dive underwater and you may witness lightshows...
The longspine seahorse ( Hippocampus histrix ), named for the spines covering its body, has a long snout and eyes that move independently of each other. Like other seahorses, the male carries the...
A video of the Palauan primitive cave eel ( Protanguilla palau ) swimming in the Pacific off the Republic of Palau . Jiro Sakaue, a Japanese research diver, first discovered the new genus and species...
“Every four years, sockeyes come inland from the Pacific to spawn. The year 2010 was the largest run in 100 years, reaching more than 30 million fish. On this day, I waited for the right sunlight,...
Tuna caught in the Indian Ocean show the huge scale of commercial fishing. More about sustainable seafood can be found in our Sustainable Seafood feature story.
A yellow moray eel, Gymnothorax prasinus , inside of a sea sponge in the waters off of Poor Knights Islands, New Zealand. Photographer Brian Skerry takes an artistic eye to his underwater photography...
An X-ray image of grooved razorfish ( Centriscus scutatus ). Razorfish are encased in thin, transparent bony plates attached to their spines, which you can see in the X-ray. Also known as shrimpfish...
This map is based on electronic tagging of Atlantic bluefin tuna ( Thunnus thynnus ) from 1996 to 2007. A team of international researchers officially classified the Atlantic bluefin as endangered in...
Using genetic analysis combined with traditional study of morphology, Smithsonian scientist Dr. Carole Baldwin and her team discovered that what were thought to be three species of the fish are...
By Lindsay Aylesworth, Project Seahorse The day I stepped into my wetsuit, donned my mask, and embarked on my first scuba dive was the day I decided to be a marine biologist. Little did I know that...
A blue cod and sea pens , a unique type of cnidarian , speckle the seafloor in New Zealand's Fiordland region.You can see more beautiful underwater photos from Brian Skerry in his image gallery .
A master of disguise, the pygmy seahorse ( Hippocampus bargibanti ) grows to only 2cm in length and matches the gorgonian coral that it lives on. The pygmy seahorse is so successful at hiding that it...
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