Your Tuna Can Carry 36 Times More Pollutants Depending on Where It Was Caught
The next time you go out for seafood, you might want to ask where the tuna was caught.
According to new research from the Scripps Institution of Oceanography at the University of California San Diego, the levels of persistent organic pollutants (POPs) in the muscle tissue of yellowfin tuna caught in the more industrialized areas of the northeast Pacific Ocean and northeast Atlantic Ocean can be as much as 36 times higher than in tuna caught in pristine waters of the West Pacific Ocean.
POPs are of global concern because they can be resistant to degradation and can accumulate in the environment and organisms alike, meaning they can pass from one species to the other through the food chain. POPs include pesticides, flame retardants and polychlorinated biphenyls (PCBs)—a banned and highly hazardous group of compounds once used for paints, electrical equipment and other products.
For the study, published in the journal Environmental Health Perspectives, researchers analyzed the containment levels of 117 yellowfin tuna caught around the world. While most of analyzed tuna would be considered safe under current consumption guidelines, the researchers noted that 90 percent of the tuna captured in the northeast Atlantic Ocean and more than 60 percent of those caught in the Gulf of Mexico contained pollutant levels that would have triggered health advisories for populations with increased risks of food-borne illnesses, including pregnant and nursing women or people with compromised immune systems.
"Surprisingly, only a few types of pollutants detected in tuna had regulatory information available to calculate meal recommendations," said Scripps postdoctoral researcher Sascha Nicklisch, who led the study. "An important issue raised by the study is how to guide science and policy on possible hazards associated with these chemicals in our food sources."
The researchers were also surprised to find Transporter Inhibiting Compounds—pollutants that can to impair the human body's defense system against chemicals and toxins—in samples from the most contaminated sites.
The study suggests that tuna consumers should know the origin of catch to avoid exposure to these pollutants.
Nicklisch told the San Diego Union-Tribune that fish caught off of Asia and in the Pacific Islands were relatively clean.
"The sites where we caught them are known to be more pristine, such as kingdom of Tonga," he said.
As NPR reported, while the current study analyzed the levels of POPs in tuna, the same group also analyzed the mercury levels in tuna for a separate report in May. Similar to POPs, the researchers found that mercury levels in the yellowfin can vary depending on the location it is caught.
- Redwoods are the world's tallest trees.
- Now scientists have discovered they are even bigger than we thought.
- Using laser technology they map the 80-meter giants.
- Trees are a key plank in the fight against climate change.
They are among the largest trees in the world, descendants of forests where dinosaurs roamed.
Pixabay / Simi Luft<p><span>Until recently, measuring these trees meant scaling their 80 meter high trunks with a tape measure. Now, a team of scientists from University College London and the University of Maryland uses advanced laser scanning, to create 3D maps and calculate the total mass.</span></p><p>The results are striking: suggesting the trees <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">may be as much as 30% larger than earlier measurements suggested.</a> Part of that could be due to the additional trunks the Redwoods can grow as they age, <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">a process known as reiteration</a>.</p>
New 3D measurements of large redwood trees for biomass and structure. Nature / UCL<p>Measuring the trees more accurately is important because carbon capture will probably play a key role in the battle against climate change. Forest <a href="https://www.wri.org/blog/2020/09/carbon-sequestration-natural-forest-regrowth" target="_blank">growth could absorb billions of tons</a> of carbon dioxide from the atmosphere each year.</p><p>"The importance of big trees is widely-recognised in terms of carbon storage, demographics and impact on their surrounding ecosystems," the authors wrote<a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank"> in the journal Nature</a>. "Unfortunately the importance of big trees is in direct proportion to the difficulty of measuring them."</p><p>Redwoods are so long lived because of their ability to <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">cope with climate change, resist disease and even survive fire damage</a>, the scientists say. Almost a fifth of their volume may be bark, which helps protect them.</p>
Carbon Capture Champions<p><span>Earlier research by scientists at Humboldt University and the University of Washington found that </span><a href="https://www.sciencedirect.com/science/article/pii/S0378112716302584" target="_blank" rel="noopener noreferrer">Redwood forests store almost 2,600 tonnes of carbon per hectare</a><span>, their bark alone containing more carbon than any other neighboring species.</span></p><p>While the importance of trees in fighting climate change is widely accepted, not all species enjoy the same protection as California's coastal Redwoods. In 2019 the world lost the equivalent of <a href="https://www.worldwildlife.org/threats/deforestation-and-forest-degradation" target="_blank" rel="noopener noreferrer">30 soccer fields of forest cover every minute</a>, due to agricultural expansion, logging and fires, according to The Worldwide Fund for Nature (WWF).</p>
Pixabay<p>Although <a href="https://c402277.ssl.cf1.rackcdn.com/publications/1420/files/original/Deforestation_fronts_-_drivers_and_responses_in_a_changing_world_-_full_report_%281%29.pdf?1610810475" target="_blank" rel="noopener noreferrer">the rate of loss is reported to have slowed in recent years</a>, reforesting the world to help stem climate change is a massive task.</p><p><span>That's why the World Economic Forum launched the Trillion Trees Challenge (</span><a href="https://www.1t.org/" target="_blank" rel="noopener noreferrer">1t.org</a><span>) and is engaging organizations and individuals across the globe through its </span><a href="https://uplink.weforum.org/uplink/s/uplink-issue/a002o00000vOf09AAC/trillion-trees" target="_blank" rel="noopener noreferrer">Uplink innovation crowdsourcing platform</a><span> to support the project.</span></p><p>That's backed up by research led by ETH Zurich/Crowther Lab showing there's potential to restore tree coverage across 2.2 billion acres of degraded land.</p><p>"Forests are critical to the health of the planet," according to <a href="https://www.1t.org/" target="_blank" rel="noopener noreferrer">1t.org</a>. "They sequester carbon, regulate global temperatures and freshwater flows, recharge groundwater, anchor fertile soil and act as flood barriers."</p><p><em data-redactor-tag="em" data-verified="redactor">Reposted with permission from the </em><span><em data-redactor-tag="em" data-verified="redactor"><a href="https://www.weforum.org/agenda/2021/03/redwoods-store-more-co2-and-are-more-enormous-than-we-thought/" target="_blank">World Economic Forum</a>.</em></span></p>
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