Scientists who peered inside snoozing zebrafish have spotted some strikingly familiar patterns of activity.

Rog Hanson created a secret habitat for seahorses in the coastal waters off Long Beach. He's come to see them about 1,000 times.

Floating sunscreen, cloud brighteners and killer robots are just a few of the measures scientists are hoping will save the world's coral.

From sperm whales to dolphins, marine mammals in the eastern Mediterranean face a lethal threat from oil and gas exploration

A retired naval officer dove in a submarine nearly 36,000ft into the deepest place on Earth, only to find what appears to be plastic

Some species of squids, crabs and octopuses may be losing their vision in Earth's oxygen-starved oceans.

The Gulf of Mexico could see one of its largest dead zones on record this summer, according to researchers.

In a new survey of the sub-seafloor off the U.S. Northeast coast, scientists have made a surprising discovery: a gigantic aquifer of relatively fresh water trapped in porous sediments lying below the salty ocean.

New study: Ingesting even a single piece of plastic exposes sea turtles to a 20% chance of death.

For the first time, a species of fish has demonstrated evidence of possible self-awareness by passing the famous mirror test.

The planet’s coral reefs are in trouble. Thanks to warming and acidifying oceans, the animals that make up coral reefs are dying, turning the reefs themselves into algae-covered ghost towns. This represents a loss of habitat for numerous nearby creatures, many of which evolved to only live in the reefs. So the deaths of the corals can lead to the deaths of many other species. From monitoring the reefs by listening to them to local action and working to understand the dynamics of coral illness, scientists and conservationists...

The dead sperm whale, which washed ashore in Indonesia, had ingested nearly 6kg of plastic waste.

Plastic was found in the gut of every single sea turtle examined in a new study, casting fresh light on the scale of plastic pollution in the world's oceans. The research, published in the journal Global Change Biology, examined more than 100 sea turtles of all seven species, across the Atlantic, Pacific and Mediterranean.

Some fish parasites are on the rise, bringing with them risks to human health and fisheries-based economies. Now researchers have a new way to track their numbers—by digging into old records and museum samples. Recent years have seen alarming outbreaks of disease in fish and other marine species, including one that caused a massive die-off of sea stars in the northeast Pacific starting in 2013. But it has not been clear whether this uptick in illnesses was due to an actual increase in the number of pathogens...

An analysis concluded that Earth’s oceans are heating up 40 percent faster on average than a United Nations panel estimated five years ago, a finding with dire implications for climate change.

Underwater robot has delivered over 100k baby corals in attempt to restore part of the Great Barrier Reef

Increasing ship traffic, sonar and seismic air gun blasts now planned for offshore drilling may be disrupting migration, reproduction and even the chatter of the seas’ creatures.

A prized delicacy in Japan, where poisonous varieties are prepared by skilled chefs, pufferfish are giving spicy crayfish a run for their money in Beijing

The salt and chemicals in the brine left over from desalination can threaten local marine ecosystems

Research shows how the Antarctic blackfin icefish differs from its close relatives on the genetic level.

In the Mariana Trench, the lowest point in any ocean, every tiny animal tested had plastic pollution hiding in its gut.

Even the largest ecosystems have limits when it comes to recovering from the impact of climate change, according to new research from Australia.

The creatures are not just incredibly clever, but also carnivorous, meaning a huge amount of wild fish will be caught to feed them, putting pressure on the ecosystem.

The oceans hide all kinds of secrets and unknowns in the deep – like the 195,728 viruses that scientists just found lurking underwater, during the course of a pole-to-pole expedition carried out to survey marine life. The researchers say the vast m

Coffinfish hold water over their gills for up to 4 minutes

A buoy and rope that was found entangling the whale was marked with the owner's name and number and was eventually traced to a Nova Scotia fisherman.

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.