The overriding theory is that it's a bloom of algae brought on by rising water temperatures.

Mexico, Jul 30 (Prensa Latina) The massive arrival of sargasso on the coasts of Quintana Roo, one of Mexico's main tourist centers, is causing concern among tourists, researchers, authorities, businessmen and residents.

Nearly 4,000 dead fish were counted on Sanibel area beaches and parks.

A rare whale-dolphin hybrid species has been discovered off the coast of Hawaii, scientists say. The animal is the first-ever documented offspring of a rough-toothed dolphin and the rare melon-headed whale, a team from the Cascadia Research Collective concluded in a report released this week.

Hundreds of sea turtles have washed up dead along the southwest Florida coast as an ongoing red tide event persists in the waters. The Florida Fish and Wildlife Conservation Commission has logged 287 sea turtle deaths since the virulent algal bloom started in October, the Associated Press reported.

If you see something that looks like tomato soup in Puget Sound, here's why.

Algae blooms have infiltrated much of the Cape Coral canal system, creating a foul odor and a green, spray-paint tint to some of the water.

The images are shocking, but perhaps not for people who live in the Dominican Republic.'It happens pretty much all the time,' says Cyrill Gutsch

Warmer waters likely enabled a phytoplankton bloom to occur much later in the year than normal off the coast of Alaska and British Columbia.

Slow sockeye salmon (Oncorhynchus nerka) runs in the Aleutians potentially linked to warming ocean temperatures.

A species commonly referred to as “red tide” has been spotted around B.C. coastal waters over the past month.

The statistics in her recently published paper say it all: hundreds of glaciers in Canada's High Arctic are shrinking and many are likely to disappear completely.

Residents of Chevak and Hooper Bay found two species of sea bird either dead or approachable near the mouth of the Kiuqliiviq and Aprun rivers near fish camps. Residents of Hooper Bay also found a dead sea mammal on the beach.

With current tropical conditions set to continue for another week, the situation is not likely to improve before the end of July or early August.

Ocean water has a green tint near Craig and Klawock, Alaska.

After a very slow beginning to their season, fishermen in Ugashik Bay saw millions of sockeye salmon return in a little over a week in mid-July.

City released a notice Thursday, saying the water is safe

As the climate changes, powerful Arctic cyclones—storms that hammer the sea with pounding rain and gusting winds—are expected to grow stronger and more frequent. As these two trends converge, the potential for catastrophe is rising.

Australia has seen an unprecedented number of widespread, catastrophic transformations in response to extreme weather events.

We observed large patches of marine macro-algae (Sargassum sp.) floating just offshore, drifting north, and getting stranded on the beach.