Gray whales are dying at alarming rates. A Times investigation of their migrations from Mexico to Alaska offers clues to what is causing this marine mystery.

A virulent and fast-moving coral disease that has swept through the Caribbean could be linked to waste or ballast water from ships, according to research. The deadly infection, known as stony coral tissue loss disease (SCTLD), was first identified in Florida in 2014, and has since moved through the region, causing great concern among scientists.

‘They grow bigger than you think and contribute to poor water quality by mucking up the bottom sediments and uprooting plants,’ warns Minnesota town

A whale shark, rare corals, and a transparent octopus are just some of the animals researchers found in the depths of the Pacific.

Fresh research shows piscine orthoreovirus was introduced to southern B.C. from Atlantic salmon eggs roughly 30 years ago, despite assertions from government and industry groups that the virus is 'endemic' to the province

A female fisher was seen with kits, which biologists say is the first indication the North Cascades can support a reproductive population of fishers.

New research combines cutting-edge engineering with animal behaviour to explain the origins of efficient swimming in nature’s underwater acrobats: seals and sea lions.

The Chagos Archipelago is one of the most remote, seemingly idyllic places on Earth. Coconut-covered sandy beaches with incredible bird life rim tropical islands in the Indian Ocean, hundreds of miles from any continent. Just below the waves, coral reefs stretch for miles along an underwater mountain chain.

Dragging heavy nets across seabed disturbs marine sediments, world’s largest carbon sink, scientists report

Analysis suggests the risk of extinction of some species may not be as high as previously thought, but researchers warn local depletion still has a devastating impact

It’s winter in Miami. Many New Englanders come here to escape the snow, although none opt for snorkeling on this windy January morning. We pull off the side of the highway with specific instructions about where to find a particular species of seagrass from Laura Eldredge, manager of the Biscayne Bay Aquatic Preserves.

Sawfish have lost 59% of their historical distribution and are heading toward complete extinction due to overfishing, a new study says, posing a threat to ocean biodiversity and indicating that policies worldwide to protect the world's largest ray are not being enforced.

New figures show just how abundant ecologically destructive carp are in Australia's waterways - now the government is considering using a herpes virus to reduce the population

The world's largest animals are unusually good at taking carbon dioxide out of the atmosphere.

Preserving our pristine seas will boost biodiversity, replenish fishing stocks, and store carbon.

The air was warm as the skies grew dark over Diego Garcia. As the nearly full moon reached its highest point, a green sea turtle scuttled her way onto the...

A vast, mostly invisible ecosystem crucial to our life on Earth is in trouble, but efforts to save the 'prairies of the sea' are finally coming into focus

A sargassum bloom the width of the Atlantic Ocean caused havoc on beaches, but locals in Mexico and the Caribbean are fast finding ways to turn the seaweed invasion to their advantage.

Octopuses use their arms to ‘lick’ prey – which researchers say adds to evidence that the cephalopods’ eight appendages are analogous to tongues with ‘hands’ and ‘brains’

Ram's horn shells are small, delicate spiral structures beachcombers can commonly find throughout the world.