Category: Oceans

Despite shrinking ‘Dead Zone’, Gulf Coast grapples with massive fish die-off

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A shrimp boat trawls for shrimp in the Gulf of Mexico. (Image credit: NOAA Fisheries)
A shrimp boat trawls for shrimp in the Gulf of Mexico. (Image credit: NOAA Fisheries)

NOAA anticipated a remarkably smaller ‘Dead Zone’ in Gulf of Mexico this summer

The National Oceanic and Atmospheric Administration (NOAA) predicted a “dead zone” in the Gulf of Mexico this summer, an oxygen-deprived area spanning about 4,155 square miles that can prove lethal to marine life. This estimate, while significant, is lower than the 36-year average of 5,364 square miles. The dead zone occurs annually due to excessive nutrient pollution from human activities within the Mississippi River watershed.

The US Geological Survey (USGS) tracks key factors such as river discharge and nutrient loading, which contribute to the dead zone. In May 2023, there was a 33% decrease in river discharge, a 42% decrease in nitrate, and a 5% decrease in phosphorus levels compared to the long-term averages from 1980 to 2022. These nutrients instigate an algal bloom that, upon death and decay, depletes water oxygen levels, endangering marine life, especially bottom-dwelling species.

NOAA’s hypoxia forecasts are designed to help coastal managers and stakeholders proactively mitigate the impacts of hypoxia. The data also inform nutrient reduction targets aimed at curbing future dead zones. The Interagency Mississippi River and Gulf of Mexico Hypoxia Task Force aims to reduce the dead zone to 1,900 square miles by 2035.

Despite smaller ‘Dead Zone’, thousands of fish perish on Texas Gulf Coast

The New York Times along with several other media outlets reported that on Friday, tens of thousands of fish started washing ashore along the Texas Gulf Coast due to a combination of environmental conditions that depleted oxygen levels in the warm waters. The incident was described as a “perfect storm” of poor conditions by Bryan Frazier, the director of Brazoria County Parks Department. Warm water holds less oxygen than cold water, and the calm, cloudy weather obstructed the usual ways oxygen is infused into ocean water. The fish are thought to have been trapped in shallow, warm water where the oxygen supply diminished.

Experts suggest that climate change could be contributing to such incidents as warmer waters become more common. Katie St. Clair, the sea life facility manager at Texas A&M University at Galveston, said that rising water temperatures could lead to more such events, especially in shallow, near-shore environments.

Frazier noted that these fish kills are not uncommon during warmer periods and predicted local water conditions would improve as ocean waves reintroduce oxygen and fish leave low-oxygen areas. However, the United Nations reported in 2019 that warmer ocean waters have increased incidences of hypoxia (low oxygen levels), posing threats to fish populations.

The fish kill could significantly impact the environment as the dead fish, primarily Gulf menhaden, play a crucial role in the local ecosystem. Clean-up operations are ongoing to prevent the dead fish from rotting in the midday heat.

Ocean warming study so distressing, some scientists didn’t even want to talk about it

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Ship in the ocean, Hamburg, Germany. Photo by Martin Damboldt from Pexels.
Ship in the ocean, Hamburg, Germany. Photo by Martin Damboldt from Pexels.

“This is one of those ‘sit up and read very carefully’ moments,” said one science journalist.

By Julia Conley, Common Dreams

Scientists are so alarmed by a new study on ocean warming that some declined to speak about it on the record, the BBC reported Tuesday.

“One spoke of being ‘extremely worried and completely stressed,'” the outlet reported regarding a scientist who was approached about research published in the journal Earth System Science Data on April 17, as the study warned that the ocean is heating up more rapidly than experts previously realized—posing a greater risk for sea-level rise, extreme weather, and the loss of marine ecosystems.

Scientists from institutions including Mercator Ocean International in France, Scripps Institution of Oceanography in the United States, and Royal Netherlands Institute for Sea Research collaborated to discover that as the planet has accumulated as much heat in the past 15 years as it did in the previous 45 years, the majority of the excess heat has been absorbed by the oceans.

In March, researchers examining the ocean off the east coast of North America found that the water’s surface was 13.8°C, or 24.8°F, hotter than the average temperature between 1981 and 2011.

The study notes that a rapid drop in shipping-related pollution could be behind some of the most recent warming, since fuel regulations introduced in 2020 by the International Maritime Organization reduced the heat-reflecting aerosol particles in the atmosphere and caused the ocean to absorb more energy.

But that doesn’t account for the average global ocean surface temperature rising by 0.9°C from preindustrial levels, with 0.6°C taking place in the last four decades.

The study represents “one of those ‘sit up and read very carefully’ moments,” said former BBC science editor David Shukman.

Lead study author Karina Von Schuckmann of Mercator Ocean International told the BBC that “it’s not yet well established, why such a rapid change, and such a huge change is happening.”

“We have doubled the heat in the climate system the last 15 years, I don’t want to say this is climate change, or natural variability or a mixture of both, we don’t know yet,” she said. “But we do see this change.”

Scientists have consistently warned that the continued burning of fossil fuels by humans is heating the planet, including the oceans. Hotter oceans could lead to further glacial melting—in turn weakening ocean currents that carry warm water across the globe and support the global food chain—as well as intensified hurricanes and tropical storms, ocean acidification, and rising sea levels due to thermal expansion.

A study published earlier this year also found that rising ocean temperatures combined with high levels of salinity lead to the “stratification” of the oceans, and in turn, a loss of oxygen in the water.

“Deoxygenation itself is a nightmare for not only marine life and ecosystems but also for humans and our terrestrial ecosystems,” researchers from the Chinese Academy of Sciences, the National Center for Atmospheric Research, and the National Oceanic and Atmospheric Administration said in January. “Reducing oceanic diversity and displacing important species can wreak havoc on fishing-dependent communities and their economies, and this can have a ripple effect on the way most people are able to interact with their environment.”

The unusual warming trend over recent years has been detected as a strong El Niño Southern Oscillation (ENSO) is expected to form in the coming months—a naturally occurring phenomenon that warms oceans and will reverse the cooling impact of La Niña, which has been in effect for the past three years.

“If a new El Niño comes on top of it, we will probably have additional global warming of 0.2-0.25°C,” Dr. Josef Ludescher of the Potsdam Institute for Climate Research told the BBC.

The world’s oceans are a crucial tool in moderating the climate, as they absorb heat trapped in the atmosphere by greenhouse gases.

Too much warming has led to concerns among scientists that “as more heat goes into the ocean, the waters may be less able to store excess energy,” the BBC reported.

The anxiety of climate experts regarding the new findings, said the global climate action movement Extinction Rebellion, drives home the point that “scientists are just people with lives and families who’ve learnt to understand the implications of data better.”

‘The biggest conservation victory ever!’ Global treaty to protect oceans reached

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Photo of coral reef by Jimmy Chang on Unsplash.
Photo of a coral reef by Jimmy Chang on Unsplash.

“This is a historic day for conservation and a sign that in a divided world, protecting nature and people can triumph over geopolitics,” said Greenpeace in response to an agreement to protect world’s marine biodiversity.

By Jon Queally, Common Dreams

Ocean conservationists expressed elation late Saturday after it was announced—following nearly two decades of consideration and effort—that delegates from around the world had agreed to language for a far-reaching global treaty aimed at protecting the biodiversity on the high seas and in the deep oceans of the world.

“This is a historic day for conservation and a sign that in a divided world, protecting nature and people can triumph over geopolitics,” declared Dr. Laura Meller, the oceans campaigner for Greenpeace Nordic.

“We praise countries for seeking compromises, putting aside differences, and delivering a Treaty that will let us protect the oceans, build our resilience to climate change and safeguard the lives and livelihoods of billions of people,” Meller added.

The final text of the Global Ocean Treaty, formally referred to as the Biodiversity Beyond National Jurisdiction treaty (BBNJ), was reached after a two-week round of talks that concluded with a 48-hour marathon push between delegations at the United Nations headquarters in New York.

“This is huge,” said Greenpeace in a social media post, calling the agreement “the biggest conservation victory ever!”

Rena Lee of Singapore, the U.N Ambassador for Oceans and president of the conference hosting the talks, received a standing ovation after announcing a final deal had been reached. “The shipped has reached the shore,” Lee told the conference.

“Following a two-week-long rollercoaster ride of negotiations and super-hero efforts in the last 48 hours, governments reached agreement on key issues that will advance protection and better management of marine biodiversity in the High Seas,” said Rebecca Hubbard, director of the High Seas Alliance, a coalition of over 40 ocean-focused NGOs that also includes the International Union for the Conservation of Nature (IUCN).

Minna Epps, director of the Global Marine and Polar Programme at the IUCN, said the agreement represents a new opportunity.

“The High Seas Treaty opens the path for humankind to finally provide protection to marine life across our one ocean,” Epps said in a statement. “Its adoption closes essential gaps in international law and offers a framework for governments to work together to protect global ocean health, climate resilience, and the socioeconomic wellbeing and food security of billions of people.”

Protecting the world’s high seas, which refers to areas of the oceans outside the jurisdiction of any country, is part of the larger push to protect planetary biodiversity and seen as key if nations want to keep their commitment to the UN-brokered Kunming-Montreal Global Biodiversity Framework—also known as the known as the 30×30 pledge—that aims protect 30 percent of the world’s natural habitat by 2030.

“With currently just over 1% of the High Seas protected,” said the High Seas Alliance in a statement, “the new Treaty will provide a pathway to establish marine protected areas in these waters.” The group said the treaty will make acheiving the goals of the Kunming-Montreal agreement possible, but that “time is of the essence” for the world’s biodiversity.

“The new Treaty will bring ocean governance into the 21st century,” said the group, “including establishing modern requirements to assess and manage planned human activities that would affect marine life in the High Seas as well as ensuring greater transparency. This will greatly strengthen the effective area-based management of fishing, shipping, and other activities that have contributed to the overall decline in ocean health.”

According to Greenpeace’s assessment of the talks:

The High Ambition Coalition, which includes the EU, US and UK, and China were key players in brokering the deal. Both showed willingness to compromise in the final days of talks, and built coalitions instead of sowing division. Small Island States have shown leadership throughout the process, and the G77 group led the way in ensuring the Treaty can be put into practice in a fair and equitable way.

The fair sharing of monetary benefits from Marine Genetic Resources was a key sticking point. This was only resolved on the final day of talks. The section of the Treaty on Marine Protected Areas does away with broken consensus-based decision making which has failed to protect the oceans through existing regional bodies like the Antarctic Ocean Commission. While there are still major issues in the text, it is a workable Treaty that is a starting point for protecting 30% of the world’s oceans.

The group said it is now urgent for governments around the world to take the final step of ratifying the treaty.

“We can now finally move from talk to real change at sea. Countries must formally adopt the Treaty and ratify it as quickly as possible to bring it into force, and then deliver the fully protected ocean sanctuaries our planet needs,” Meller said. “The clock is still ticking to deliver 30×30. We have half a decade left, and we can’t be complacent.”