Scientists in the Klamath Basin have begun prepping for the return of an untamed river...

Prof Terry Hughes says he believes bleaching is under way as the Australian government conducts monitoring flights over 2,300km reef

About 51 trillion microplastics are floating in the surface waters of oceans around the world. Originating from various types of plastics, these tiny fragments (less than 5 millimeters in length) pollute natural ecosystems. Hundreds of studies have surveyed plastic debris on the surface or near surface of the ocean. However, these studies only "scratch the surface," and do not provide a complete inventory of what's lurking beneath.

River Dee initiative comes as rising water temperature from climate heating threatens species’ survival

Meet Methuselah, the fish that likes to eat fresh figs, get belly rubs and is believed to be the oldest living aquarium fish in the world. In the Bible, Methuselah was Noah’s grandfather and was said to have lived to be 969 years old. Methuselah the fish is not quite that ancient, but biologists at the California Academy of Sciences believe it is about 90 years old, with no known living peers.

A beloved fish with a rich history has become hard to find—will it rise again?

Scientists made an incredible discovery in November: acres of giant, pristine, rose-shaped corals blossoming from the sea floor in what's known as the ocean's "twilight zone."

A budding industry that aims to catch zooplankton for health supplements and fish food has scientists fearing that its effects on marine ecosystems could be devastating

‘Seeing one in real life is indescribable,’ says marine biologist of the technicolour marine mollusc she spotted off Queensland

It is the first time an extinct species of fish has been successfully reintroduced in Mexico

Researchers from the University of Adelaide have found that the way fish interact in groups is being upset by ocean acidification and global warming.

Underwater recorders have picked up the sounds of orcas in places they haven’t previously been detected

Invasive goldfish are a 'big problem,' Fisheries and Oceans Canada said, because they take away key spawning sites from native fish species.

“Our results say that if we restore whale populations to pre-whaling levels seen at the beginning of the 20th century, we’ll restore a huge amount of lost function to ocean ecosystems,” researchers said.

Results show that by the end of this century, lower-oxygen water on the Pacific Northwest coast will pose the biggest threat to Dungeness crabs. And while these crabs start as tiny, free-floating...

Seatrec and Bedrock Ocean Exploration are two startups taking electric robots to new depths in an attempt to map the ocean floor.

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.