Aerial surveys show almost no reefs across a 1,200km stretch escaping the heat, prompting scientists to call for urgent action on climate crisis.

The Alaska Department of Fish and Game found an unexpectedly low number of clams during final surveying, but the agency still plans to monitor them in support of perhaps opening the fishery in years to come.

Shocking images have emerged from New Zealand showing millions of once-velvety brown sea sponges bleached bone white, the worst mass bleaching event of its type ever recorded, marine scientists say.

The red king crab that wasn't red appeared in Nome on Fourth of July.

The European black slug was first introduced into Alaska in the 1980s in Cordova, Slowik said. It eventually made its way to Juneau and Ketchikan, likely hitching a ride on fishing gear, and is now prevalent across Southeast. A few years ago, people started seeing the slug in Whittier and Girdwood.

Last summer while scoping for marine invasive species we found the invasive colonial tunicate, Didemnum vexillum also know as marine vomit.

Researchers from the Coral Reef Ecology Lab at the Hawai'i Institute of Marine Biology documented the third global bleaching event as it occurred from 2014 to 2016 at the Hanauma Bay Nature Preserve (HBNP) on the island of O'ahu, Hawai'i. Their findings, published in the international journal PeerJ, show that temperature is by far the most influential factor in coral bleaching at this well-managed location where corals, fish, and all other organisms are protected.

New data show the population of baby lobsters off New England is below average, raising concerns about the size of future commercial hauls of the valuable crustaceans as waters warm.

The lobster population along the Norwegian coast is much worse off than first thought. New research shows a huge decline.

Summer commercial Dungeness crabbing was well below average in Lynn Canal, with fishermen hauling in an estimated 105,000 pounds this year compared

Otago University's Marine Science Professor Steve King said the summer stranding is nothing to be alarmed about. "It's a natural cycle of the pelagic food where climate change is happening but it is mostly manifested in the warm water conditions we are seeing right now."

They are brightly coloured, beautiful and hungry — tropical fish and sea urchins are thriving in southern waters warmed by climate change. But now they are devastating kelp forests already knocked around by marine heatwaves.   

Shellfish growers in Willapa Bay in southwest Washington, the self-styled "Oyster Capital of the World," are alarmed by an invasion of potentially destructive nonnative European green crabs. Some are asking for an all-out trapping offensive to corral the invasive species.