You'd be surprised where great white sharks spend a lot of their time hunting prey. Understanding how these predators feed is important for managing human-shark interactions. World-first research into shark stomach contents from University of Sydney and NSW Government scientists.

Mussel species are dying en mass in rivers across the Pacific Northwest, Midwest and South—likely from unidentified pathogens

Over the next 20 years, scientists estimate about 70 to 90% of all coral reefs will disappear primarily as a result of warming ocean waters, ocean acidity, and pollution. Expand that out to 2100 and it’s “looking quite grim,” says Renee Setter, a marine scientist at the University of Hawaii in Manoa. By 2100 there will be nearly zero suitable coral habitats remaining, eliminating nearly all living coral reef habitats.

Researchers say there are good reasons to be optimistic about the future of our oceans.

A "Dumbo" octopus is photographed at a depth of 7,000m in the Indian Ocean's Java Trench.

The "earplugs" of blue whales are preserved in their skulls throughout their lives, and keep a record of chemical changes in the animals' bodies.

A Newcastle sailor's trip across the Pacific Ocean after the Japan tsunami was frighteningly similar to a nightmare.

Explore the world’s new coastlines if sea level rises 216 feet.

For the seahorse, the shape of its head, along with its stealthy approach and lightening speed, literally makes a meal of some of the ocean’s most sought after prey: the copepod, according to a new study.

Rob Robbins and Steve Rupp have been diving under the Antarctic sea ice for a combined 60 years. Hang around their dive headquarters at McMurdo Station and you’ll see rows of oxygen tanks, wetsuits, and breathing apparatus.

The shape of the seahorse's head helps it sneak up on copepods without being noticed, a new study says.

A new study published in Nature Communications by researchers at the University of Texas at Austin and the University of Minnesota revealed that the very traits which make the seahorse so laughable - like its’ slow movements and weird shape – are actually what makes it so cunning.

It’s a truism that the ocean depths will remain Earth’s last great wilderness, and judging by the recent find of a new species of 'skeleton shrimp' there’s still a lot of eye-popping discoveries yet to be made.

Something is killing starfish up and down the West Coast and no one knows what. A mysterious illness that first appeared in June in Washington state has now spread from Sitka, Alaska, to San Diego. Starfish first waste away and then "turn into goo," divers say. Whatever is causing it can spread with astonishing speed — a healthy group of starfish can die in just 24 hours.

The bizarre ocean sunfish is the world’s biggest bony fish. The Germans call it “the swimming head,” the Chinese “the toppled car fish,” and taxonomists Mola mola — which, ironically enough for something that floats, is Latin for “millstone.” And unlike Nemo’s compatriots, it is beautifully adapted to the high seas.

He resides near the Australian coast and may have cancer due to the lack of protection from the sun.

Thanks to surging demand for seafood and woefully inaccurate catch reporting, overfishing is out of control. And new research now argues (paywall) that it’s a problem that, in many ecosystems, might be permanent. By removing one of its species, overfishing “flips” an ecosystem into an “alternative state”. It set’s off a complex reshuffling among remaining species. Often, this “locks” the ecosystem into a “alternative stable state”—meaning, the species of fish can’t come back.

A prominent marine biologist was fined $12,500 and placed on three years probation for feeding killer whales in the  Monterey Bay National Marine Sanctuary.

Or maybe he's just using it as a mirror to check himself out.

This article originally appeared on The Conversation. A century-old mystery about how ancient freshwater fishes breathe has finally been put to rest, thanks to a study published last week in Nature Communications by a team of ichthyologists and me. The fishes in question—Polypterus and related species—have tiny holes in the...