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The majestic and highly predatory red lionfish ( Pterois volitans ) , native to the Indo-Pacific, is invading Atlantic waters. The lionfish is a popular home aquarium species, and some were most likely dumped...
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Salmon are one of the most widely loved varieties of seafood in the world. A...
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Bioluminescence is one of the more captivating adaptations that have evolved in...
Scientists describe the amazing bioluminescent creatures they encounter as they...

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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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Dr. Carole Baldwin never expected to find seven new species of fish among the Starskia blennies she was studying at the...
Smithsonian researchers collected a cave basslet ( Liopropoma mowbrayi ) from the deep reefs of Curaçao , in the southern Caribbean. They used a state-of-the-art submersible to obtain the specimen...
The corkwing wrasse, or gilt-head, changes color depending on its age, sex, and breeding season. For instance, during the breeding season, males have blue spotted fins and the middle of their scales...
CREDIT: Chris Kenaley The Mystery Develops Flash forward to 1956, when scientists described another new kind of fish. It was named the tapetail because of its long, streamer-like tail. It also had a...
“ This moray eel was resting among some hard coral and was mesmerized by my dive lights, making it a very cooperative subject. The moray eel rhythmically opens and closes its mouth to move water...
Extinction is a real possibility for three species of tunas. That’s one of the messages from a new study released today online in the journal Science . Researchers assessed the range and populations...
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 .
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,...
Much like our friend the seahorse , the males of this fish raise the young. As you can see in the photograph above, the male has his clutch of eggs in his mouth. This species ( Opistognathus...
Munch, munch. The queen parrotfish ( Scarus vetula ) scrapes algae from Caribbean coral reefs with its parrot-like beak. While feeding, hard stone and coral inevitably get mixed into its lunch, which...
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...
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...
Welcome to Moorea, a tiny, isolated island in the middle of the vast Pacific. Moorea is 132 square kilometers (51 square miles) of tropical ecosystems – from jungle and wetlands to beaches and coral...
In the dark, cold waters 600 meters (nearly 2000 feet) below the ocean's surface, things happen slowly. Orange roughy ( Hoplostethus atlanticus ) , deep ocean fish that were once known as "slimeheads...
Gobies make up the largest family ( Gobiidae ) of fishes in the world, with over 2,000 species. In this large family you can also find the smallest fish. The gobies in this photo are about one inch...
Scientists in the Division of Fishes at the Smithsonian's National Museum of Natural History use X-ray imaging to study the complex bone structure and diversity of fish. This image gallery showcases...
The pre-industrial American landscape was once rightly described as a place where “the deer and the antelope roam.” On land, we take it for granted that the plant-eating deer and antelope far...
Claws, spines, spikes, tentacles, and fangs. Aliens, monsters, and ghostly apparitions glowing in the night. Marine life forms have some of the best looks for Halloween—no costumes needed. From...
Imagine eating an entire fish bigger than you—bones and all! At only 25 cm long, the black swallower often eats fish much larger than itself with the help of an expanding stomach. Sometimes the meal...
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