PORT HUGHES, Australia — Situated midway along the Great Southern Reef that spans Australia’s southern coastline, the waters off Port Hughes typically teem with life. The coastal hamlet northwest of Adelaide plays host to a multitude of coral, bivalve and fish species. But in late March, the largest and longest harmful algal bloom (HAB) in Australian history arrived to Port Hughes, depleting its waters’ rich biodiversity. The bloom had first appeared elsewhere off the state of South Australia’s coast a year earlier, causing eye and skin irritation and respiratory symptoms among beachgoers. Then, along with waves of acrid-smelling sea foam, scores of dead marine animals began washing ashore. In Port Hughes, the HAB’s impacts were most visible below the surface. The town’s wooden jetty had previously been one of the most consistent locations in South Australia to observe temperate species, said Stefan Andrews, co-founder of the Great Southern Reef Foundation, a conservation advocacy group. But by mid-April, when Mongabay joined Andrews on a dive, the site was drab compared with vibrant photographs taken in February and March. Under the jetty, sponges and corals that had previously adorned its pylons in a brilliantly hued mosaic appeared colorless. Apart from a short-headed seahorse (Hippocampus breviceps) — a “sign of hope,” Andrews called it — little life was visible in the murky waters. The reef, he said, had become quieter, lacking the sounds of snapping shrimp and other creatures that once played in the underwater soundtrack. “There’s a sense of loss when you…This article was originally published on Mongabay

JEJU ISLAND, South Korea — In April 2025, I zipped myself up into a thick wetsuit and inched down a steep, rocky ledge toward the gray-blue water encircling Beomseom, a small island off the southern coast of Jeju Island in South Korea. Then I leapt into the chilly sea and wriggled into my scuba gear while floating on the surface. In the water with me was Sanghoon Yoon, an adviser for Paran Ocean Citizen Science Center, a South Korean civil society group that advocates for the protection of the ocean. That day, Yoon was my scuba dive buddy. Yoon and I sank beneath the dangling legs of snorkelers into a watery realm of rocks and kelp. Once in deeper water, I encountered gelatinous stalks of soft coral. The polyps appeared purple, pink, red, and even orange, depending on the light. The islet of Beomseom off South Korea’s Jeju Island hosts colorful gardens of soft coral. Image courtesy of Paran. Sanghoon Hoon, an adviser to the Paran Ocean Citizen Science Center, dives among soft corals in the waters off Jeju, South Korea. Image courtesy of Paran. The soft corals I saw that day were healthy. But in 2024, soft corals around Beomseom Island and other parts of Jeju experienced what scientists are calling a “slumping” event — and what Yoon describes as “melting” — which saw soft corals losing their shape, drooping, and even dying. The event was widely reported in local media and attributed to marine heat as Jeju waters…This article was originally published on Mongabay

As offshore wind farms expand rapidly in the global renewable energy transition, scientists are studying how these large marine infrastructure projects affect ecosystems beneath the waves. Research from Wageningen University & Research in the Netherlands suggests that offshore wind may bring both risks and benefits for sharks and rays, known collectively as Elasmobranchii, which are highly sensitive to electromagnetic fields (EMFs). A six-year project called “Elasmopower” examined how EMFs from subsea power cables in offshore wind farms affect bottom-dwelling sharks and rays. These species depend on natural electric and magnetic fields for key behaviors such as navigation, prey detection, habitat use and long-distance movement, particularly in low-visibility environments. The studies conducted as part of the Elasmopower project have been published in four papers, with three additional papers currently undergoing peer review. Sharks and rays have specialized electroreceptors called ampullae of Lorenzini. The jelly-filled sensory canals around the head and snout can detect even extremely weak EMFs from prey and predators, water movement, and the Earth’s geomagnetic field, Erwin Winter, a scientist at Wageningen, told Mongabay. This system is central to hunting and orientation, making Elasmobranchii especially relevant for studying EMF exposure from offshore energy infrastructure, Winter added. Erwin Winter, a researcher with the Elasmopower project, presented findings on offshore wind, electromagnetic fields and bottom-dwelling sharks and rays at the Sharks International 2026 conference in Colombo, Sri Lanka, in May. Image by Malaka Rodrigo for Mongabay. During a presentation on a summary of the Elasmopower research at the Sharks International 2026…This article was originally published on Mongabay

The French government recently announced it has greenlit a plan to send its last captive cetaceans — two orcas and 12 dolphins — to zoos and entertainment parks in Spain. These cetaceans live in the Marineland Antibes park on the French Riviera, which closed in 2025. In 2021, France passed a law banning the breeding and keeping of cetaceans in captivity for entertainment shows, which will come into effect on Dec. 2, 2026. The orcas and dolphins at Marineland were the primary draw for visitors. The two orcas (Orcinus orca), Wikie, aged 25, and her son, Keijo, aged 12, were born at Marineland Antibes on the French Riviera and spent all their lives in concrete tanks and performing in display shows. They will now be moved to Loro Parque, a zoo and entertainment park in Tenerife on the Canary Islands. The dolphins will be split up between two parks in Valencia and Málaga on the Spanish mainland, with plans for some of them to return to France’s Beauval Zoo, when it’s ready to have them, according to reporting by Le Monde. A court-appointed expert team found in February 2026 that the concrete tanks in which the orcas lived at Marineland Antibes were in advanced structural decline, and if the mammals weren’t moved soon, they would have to be euthanized. “Faced with this emergency, we are acting to avert the worst,” Mathieu Lefèvre, France’s minister delegate for ecological transition, said in a statement, explaining the rationale for the decision. “Loro Parque…This article was originally published on Mongabay

Physicist Stephen Volz had been working with colleagues at the U.S.’s National Oceanic and Atmospheric Administration for nearly 10 years to produce a new generation of geostationary satellites — instruments that would provide critical observations about atmospheric conditions, climate patterns and weather. But when Donald Trump returned to office in January 2025, this long-term project was thrown into disarray. “This administration canceled three of the five instruments on that program,” Volz, the assistant administrator for NOAA’s National Environmental Satellite, Data, and Information Service, who has been on administrative leave since July 2025, told Mongabay. The cancellations applied to instruments that measured air pollutants, tracked lightning to forecast hurricanes and tornadoes, and monitored ocean color to detect events such as algal blooms, sargassum seaweed surges and salinity changes, according to Volz. “They said, ‘those are all wasted money, they’re climate alarmist, I don’t need air quality, I don’t need ocean color,’” Volz said about the administration’s decision. The axing of this project is just one example of what experts describe as a broad, long-term effort by the Trump administration to weaken NOAA. The long-standing scientific and regulatory agency within the U.S. Department of Commerce has historically been responsible for everything from forecasting the weather and monitoring the climate to managing fisheries and protecting marine mammals. The White House did not respond to Mongabay’s request for comment. NOAA’s GOES-19 satellite, which tracks hurricanes and tropical storms in the Atlantic Ocean basin, as well as monitor severe weather, atmospheric rivers, wildfires, volcanic eruptions…This article was originally published on Mongabay