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A strain of this green seaweed, native to the Indian and Pacific Oceans, escaped public and private aquariums in California, Japan, Australia, and Monaco. It has spread widely in the Mediterranean, replacing native plants...
Stare at a tide pool and you will often see a crust of pink coating the bottom...
It is a well-known fact that for animals living in the deep sea, food can be...
Both humans and sea lions get sick from eating fish and shellfish that have...

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Giant kelp ( Macrocystis pyrifera ) is large, brown algae that grows in dense forests along coasts around the world. Long stalks anchor each plant to the seafloor, and they grow meters high like giant trees towards the surface...
A strain of this green seaweed, native to the Indian and Pacific Oceans,...
Johnson's seagrass is the lone ocean plant species listed under the...

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Around 100 million years ago, grass from land adapted to live and reproduce while submerged in seawater—the modern-day...

The Ocean Blog

Squids, octopuses and cuttlefish, such as this Australian Giant Cuttlefish ( Sepia apama ), compose just one group of animals that call seagrass beds home. Clams and worms bury themselves in the mud...
Closest to the seeps, where the pH is lowest and the water is most acidic, corals no longer grow. Instead there are sand, rubble and seagrasses that are able to survive. Read more about how reef...
An invasive strain of the plant Phragmites australis dominates this Chesapeake Bay wetland. The plant can easily grow up to 3 meters (9.8 feet) tall and alter coastal ecosystems. Scientists at the...
For more than two centuries, Boston Harbor has been a dumping ground. In 1773, colonists famously dumped shiploads of tea to protest taxes. But in recent decades, the harbor has received less tea and...
Macroscopic Algae ( Acetabularia crenulata ). More about mangrove ecosystems can be found in the Mangroves section .
When snorkeling in the Kahekili Herbivore Fisheries Management Area (KHFMA) in West Maui, I keep an eye out for certain kinds of fish. Not the brightest or the biggest, but those herbivores such as...
As Dampier studied the plants he encountered in Australia, he wrote that they were “for the most part unlike any I had seen elsewhere.” In fact, nearly all the plants Dampier observed were entirely...
Johnson's seagrass is the lone ocean plant species listed under the Endangered Species Act. Its flowing green stalks play an important role in coastal ecosystems where they act as nursery grounds for...
Stare at a tide pool and you will often see a crust of pink coating the bottom. No, this is not bubblegum from some careless teenager’s shoe: it’s a stony kind of seaweed that, like other seaweeds,...
In the ocean, microscopic forms of algae, known as dinoflagellates , can "bloom" into dense patches near the surface, often referred to as "red tides." Some of these harmful algal blooms (HABs) are...
One of the most common inhabitants of the sargassum community, the shrimp Latreutes fucorum (Hippolytidae) is perfectly colored to hide on the leaf-like blades. Off the coast of Belize, Smithsonian...
It is a well-known fact that for animals living in the deep sea, food can be scarce. The food that is around usually rains down from above as dead animals and organic particles from plankton living...
Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island. Few fish swim in the murky waters. The causes include pollution, overfishing, and increased water...
Macroscopic algae ( Ventricaria ventricosa ), also known as "bubble algae" or "sea pearl," is widespread algal species that can withstand low light. Each of the bubbles is a single cell, making it...
California is known for it’s lovely beaches, good food, and sloping hills. But take a dive into the colder waters, and discover a new type of wonder: the California kelp forest. The kelp forests are...
The open ocean is surprisingly barren to the naked eye. Every now and again you will encounter a school of fish and their attendant predators, but most of the life that you find is gathered around...
Sargassum fluitans , a.k.a. “Gulfweed,” forms dense clumps up to the size of a beach ball that slowly rotate as they drift. The fronds are quite dense, but if you look carefully, sometimes you can...
Seagrasses don't just provide shelter for free-swimming animals, but also are a habitat for non-moving organisms, such as this sea anemone. Sessile animals attached to blades are called epibionts,...
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