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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 of...
Starksia blennies, small coral reef fish with elongated bodies, have been well-...
CREDIT: Chris Kenaley The Mystery Develops Flash forward to 1956, when...
The majestic and highly predatory red lionfish ( Pterois volitans ) , native to...

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Human infants often already resemble their parents. Visitors coo, "Oh, she has your eyes," or "He is the spitting image of his father." But what if the infant (or in this case, the larva) looked entirely different from its adult...
This aptly named fish ( Anoplogaster cornuta ) has long, menacing fangs, but...
The Sargassum frogfish Histrio histrio (Antennariidae) is a small but...

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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...
This shadowy fish, Trematomus bernacchii , is well adapted to the ice-cold water of the Antarctic: its blood comes equipped with natural antifreeze. This is a necessary adaptation because the...
Convict surgeonfish ( Acanthurus triostegus ) are the roaming sheep of the reef but, instead of noshing on grass, they feed on algae. Their grazing helps to balance the growth of algae and coral on...
Everyone knows what a fish is: from a pet goldfish to a wild sunfish, fish are globally recognized and are an important global protein source. In this slideshow, we will look at some of the most...
Is that fruit swimming in the ocean? Well it may look like fruit, but it's actually a pineapplefish ( Cleidopus gloriamaris ). Like the hard outer part of a pineapple, this fish also has an outer...
This fish belongs to a group of anglerfishes known as lophiiformes . This species, along with other anglerfishes, has a modified dorsal-fin spine, usually on the tip of the snout, which serves as a...
Find out more about the field of ichthyology and the vast collection of fishes at the Smithsonian's National Museum of Natural History --the largest in the world! Find out how these collections were...
Orange roughy ( Hoplostethus atlanticus ) is a deep ocean fish that grows and matures at a sluggish rate compared to most shallow water fish. They don't reproduce until they are at least 20 years old...
A parrotfish ( Chlorurus sordidus ) creates a mucus cocoon to protect it from parasites, like bloodsucking isopods , while it sleeps. Read more from the Citizens at Sea blog .
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...
The whale shark ( Rhincodon typus ) is the largest fish on Earth. They spend most of their lives in the deep water up to 200 meters or more, but swim up to the surface to gather food and warm their...
Scientists at the Smithsonian and partnering organizations have discovered a remarkably primitive eel in a fringing reef off the coast of the Republic of Palau . This fish exhibits many primitive...
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...
"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...
The Sargassum frogfish Histrio histrio (Antennariidae) is a small but voracious predator - it can ingest animals up to it’s own size! The fins of the frogfish are perfect for creeping around in the...
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...
Just like other seahorse species, male weedy sea dragons are the ones to get 'pregnant' and give birth to the babies. To show he is ready to hold eggs, the male wrinkles part of his tail. On this...
From parrotfish that cover themselves in a blanket of their own mucus to tiny pygmy sea horses, there are some bizarre sea creatures that live in coral reefs . In this slideshow you can explore some...
One of the first signs of a sick coral reef is seaweed creeping across the corals, stealing their precious sunny real estate. Healthy corals, however, aren't completely hopeless: in some reefs, small...
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