Blog Tags: Mercury
Ocean News: Mercury Levels Rising in Surface Waters, Penguin Species Threatened by Habitat Degradation, and More
- According to a new study, mercury levels in many of the world oceans’ surface waters have tripled due to human activity. Because mercury drains into the ocean from mines, coal-fired plants, and sewage, mercury levels are higher in surface waters compared to the deep ocean. The Guardian
We all know that seafood is good for you, and that fish is high in heart-healthy omega-3s. And I’m sure you’ve also heard warnings about mercury levels in certain species of fish, especially if you or anyone you know is starting a family. But you might not know that the chlorine industry was a major source of mercury released to our environment.
The Food and Drug Administration (FDA) is updating their mercury-advisory guidelines for the first time in ten years, and is taking a new approach to advising mercury consumption: encouraging informed intake rather than avoidance.
Earlier this week, Washington State Governor Jay Inslee signed into law House Bill 1200 (HB 1200), which will begin to tackle seafood fraud throughout the state. Seafood fraud switches out the fish consumers intend to purchase with fish that is cheaper, less sustainable, or even dangerous. Oceana’s recent seafood fraud report found that 18 percent of fish sampled and sold in Seattle, WA, was mislabeled. And Washington’s results were better than most – our testing showed that fully one-third of seafood in restaurants and grocery stores throughout the country is mislabeled. Among specific cities and regions of the country, the numbers get even worse: 38 percent of Miami samples were mislabeled, 39 percent of New York City samples were mislabeled, and an incredible 52 percent of samples we tested in Southern California were not what they were labeled.
Whether you fear them or admire them, most people have an instant reaction when they hear great white shark.
Intrigue, mystery, and terror have guided attention on great white sharks since they lit up the screens in the 1975 thriller “Jaws.” The film made history 37 years ago for its chilling characterization of these powerful sharks, and swimming in the open ocean has never been the same since.
Great whites are making history once again, this time for their globally declining populations from bycatch in commercial fisheries, capture in beach protective nets, and slaughter for their fins, teeth, and jaws in the shark fin and curio trade.
Here on the US West Coast, new scientific studies have shed light on the status of great white sharks off California and Baja California, Mexico. Our great white sharks are even more unique than we thought; in fact they are genetically distinct and isolated from all other great white sharks around the world. They congregate off Mexican Islands and the “red triangle” off Central California (including the Farallon Islands, Point Reyes, and Point Sur), and make extensive offshore migrations to the distant “white shark Café” and even to the Hawaiian Islands.
But, sadly there may be as little as a few hundred adult great white sharks remaining in this population, far less than anyone expected. This low population alone puts these great whites at great risk of extinction from natural and human-caused impacts. Continued existence of these West Coast great white sharks is threatened by their low population size, inherent vulnerability to capture, slow growth rate, low reproductive output, and the ongoing threats they face from human activities. This is why Oceana is petitioning the federal government and the state of California to list this population of iconic sharks on the Endangered Species List.
What is threatening great white sharks off California and Mexico?
Young great white sharks are un-intentionally caught as bycatch in commercial fishing entangling nets. Set and drift gillnets--which together target California halibut, yellowtail, white seabass, thresher sharks and swordfish--catch great white shark pups in their nursery grounds.
Since 1980, over 10 great white shark pups have been reported being caught in these nets every year. The scary part is that monitoring of bycatch on these fishing vessels is very low so take of these pups remains underreported. In other words, more great white sharks are caught than we are aware.
Additionally, young great white shark “pups” caught in their nursery grounds off the Southern California coast have the second highest mercury level tested on record for any sharks worldwide. These mercury levels exceed six-fold the established thresholds where harmful physiological effects have been documented in other marine fish. Levels of harmful contaminants of PCBs and DDTs in their liver tissue are the highest observed in any shark species reported to date globally.
Endangered species status will bestow additional protections to white sharks, including better monitoring and management to reduce fishery bycatch and additional research to further understand these fascinating top predators of the sea.
As much as we may fear them for their bad rap, we need great white sharks to keep our oceans healthy. Just as wolves keep deer populations under control, great white sharks play a critical top-down role in structuring the marine ecosystem by keeping prey populations in check, such as sea lions and elephant seals, benefiting our fisheries and abundant wildlife.
Listing the West Coast population of great white sharks on the Endangered Species List will help us learn more about the lives and threats of these amazing animals through additional research funding and protection measures.
Please help us in our efforts to protect US West Coast great white sharks from extinction by signing a letter of support for their listing on the Endangered Species Act.
The health benefits of seafood are well-documented, but some people avoid eating it after hearing reports of high mercury levels. This video might help make things a little clearer.
Produced by the Dartmouth Toxic Metals Superfund Research Program, the video explains how mercury gets into water and then into the fish that we eat. Burning coal releases mercury into the air and increases its concentrations in our waterways. Depending on where in the food chain a fish is, it could have low levels of mercury or high levels that could be unhealthy.
Eating seafood has many health benefits—it has important Omega 3 fatty acids and is low in the saturated fats you find in other animal proteins, especially red meat. Many fish are safe and healthy to eat. While shark, swordfish, king mackerel, tilefish, and tuna have higher mercury levels, there are plenty of other options that are safe to eat. You can find responsible and healthy seafood choices in our Sustainable Seafood Guide.
Check out the video, which also features Oceana senior scientist Kim Warner, to learn more about how mercury builds up in the environment and how to stay healthy while including seafood in your diet.
It might seem straight out of science fiction, but this story is real – radioactive tuna could be swimming in an ocean near you.
A new study found that after last spring’s Fukushima nuclear accident, Pacific Bluefin tuna caught off of San Diego appear to have been contaminated by radioactive materials from last spring’s nuclear accident in Japan.
The March 2011 earthquake and subsequent tsunami led to the meltdown of the Fukushima nuclear plant in central Japan. Even now, the only way to enter the zone 20 kilometers around the plant is with special government permission. After the accident, tests showed that concentrations of radioactive Cesium in coastal waters increased up to 10,000-fold.
This study, published in the Proceedings of the National Academy of Sciences, found the same radioactive Cesium in 15 Bluefin tuna specimens caught outside of San Diego. The fish tested showed a 10-fold increase from normal Cesium concentrations, well below the safety limit established by Japanese Ministry of Agriculture, Forestry, and Fishes.
Bluefin are a highly migratory species – they spawn in the West Pacific near Japan, then, once they have matured, may travel more than 9,000 miles to the East Pacific and the California coast. They’re such strong swimmers that the trip only takes a few months.
During the course of this trip, the radioactive concentration fell as the fish grew and the Cesium decayed. If they had tested tuna from Japan, the radiation would be expected to be up to 15 times more concentrated, according to Daniel Madigan, Zofia Baumann, and Nicholas Fisher, the co-authors of the study.
Monterey Bay Aquarium’s Seafood Watch already lists bluefin as a species to avoid due to severe overfishing and high mercury levels. They’re highly valued as sushi fish, which has led to a steep decline in their populations in both the Atlantic and Pacific oceans. Bluefin tuna are slow to mature, and are often caught before they have a chance to reproduce. Oceana is currently working to protect bluefin tuna from overfishing.
With the help of sustainable seafood guides such as Seafood Watch, we can make informed decisions about what type of seafood to buy based on mercury levels, the type of fishing gear used, and the health of the fishery.
But those guides are undermined if the fish itself is mislabeled. Oceana recently uncovered through DNA testing that in Los Angeles County, 55% of commonly swapped seafood was indeed labeled incorrectly.
This means that we may only be getting the fish we ordered half the time. Seafood fraud is unfair to consumers who may be faced with health risks from consuming seafood with higher contaminant levels, or who are paying more for a less desirable substitute. We should be empowered to consume seafood we think is best for our health and we have the right to be served the seafood we are paying for.
The frustrating part is that there is little oversight on the long journey seafood takes from the ocean to our plate -- from transport to processing, to labeling, to shipping, and finally to grocery stores or restaurants. This extensive journey with little oversight and labeling leaves plenty of room for key information to be lost and for fraud to occur.
So what can be done about seafood fraud?
California is taking a step forward to begin tackling this problem at the state level through new legislation. Senator Ted Lieu introduced Senate Bill 1486, sponsored by Oceana, to require labeling of seafood at large chain restaurants (with 19 or more facilities).
If the bill passes and is signed into law by Governor Brown, chain restaurants will be required to provide information on seafood items ordered including what the species of seafood is; in what country it was caught; and whether it is farmed or wild-caught. So rather than just seeing “Fish sandwich” on the menu, customers will have the information needed to make informed decisions based on health, sustainability, and buying local.
The Senate Health Committee passed the bill at the end of the day yesterday. A huge thanks to the more than 5,000 Oceana Wavemakers in California who weighed in support of this bill with their legislators!
Despite trying to make the best eco-conscious decision, we are being swindled and deceived. Not only is it unjust to consumers, but to the environment and to those fishermen using more responsible practices.
We’ll keep you posted as this legislation progresses, and thanks again for your support.
Great news! On Friday, Marketwatch reported that another chlorine plant will stop polluting the atmosphere and waterways, and ultimately our seafood, with dangerous mercury.
The chlorine plant, owned by chemical giant PPG and located on the Ohio River in West Virginia, would be the eighth to stop using mercury-polluting technology since Oceana started our campaign. When we began our campaign, nine plants in the U.S. used outdated technology that resulted in mercury pollution; with PPG’s announcement, just one mercury-based plant remains.
Mercury is a neurotoxin that can harm the development of children. It has become so prevalent in seafood that the federal government advises women of childbearing age and children not to eat swordfish, king mackerel, tilefish or shark, and to limit eating albacore tuna, because they contain high levels of mercury.
Oceana has also been active in combating mercury contamination internationally. Recently, Oceana board member and entrepreneur María Eugenia Girón wrote about Spain’s decision to finally issue a formal advisory about mercury in seafood after pressure from Oceana.
We’re dedicated to ensuring we have safe, healthy, abundant seafood around the world. Once again, your support helps make this possible. Thank you!
Oceana is a truly international organization, with campaigners at work in places from Alaska to Chile and Europe. And our leadership reflects that international agenda. We’re fortunate to have the vision of board members from around the world.
In the past week, two of our board members have spoken up on our behalf with essays in the Huffington Post, and I wanted to share their insight with you.
María Eugenia Girón is a Spanish business leader as well as Oceana board member, and she reported on Oceana’s successful battle to get the government of Spain to issue mercury warnings on certain seafood. Spain is one of the world’s largest consumers of seafood per capita, so the warning is much-needed. The announcement came after Oceana was forced to sue the Spanish government to release its own reports that show high levels of mercury in Spanish seafood.
María writes in the Huffington Post:
As a Spaniard, I'm proud of our seafood tradition. Unfortunately, as a mother, I'm worried. There's a downside to our seafood habit: studies have shown that the mercury level in our blood is 10 times that of the average level in the US and in other countries.
The next step is to get Spanish grocery stores to post mercury warnings, much like the stores on Oceana’s Green List in the U.S. have done after our prodding.
Our chairman, Dr. Kristian Parker, is a marine biologist and citizen of Denmark. He reported on Oceana’s summer expedition in northern Europe’s Baltic Sea. He writes:
Despite being surrounded by some of Europe's oldest cities, such as Stockholm and Copenhagen, the Baltic Sea doesn't get too much global attention. That's a shame, because the Baltic has provided fish for millions of people since the days of the Roman Empire. Unfortunately, the sea is increasingly sick as a result of decades of pollution and overfishing.
The Baltic Sea expedition was the first of its kind launched by a nonprofit; the crew of campaigners and scientists covered 7,000 nautical miles, some of it in absolutely frigid conditions. Now back on shore, we will analyze all the good data the crew gathered to help make the case for additional protections for this important source of seafood in Europe.
Several other members of our board of directors, including board president Keith Addis and Susan Rockefeller, have also spoken out on Oceana’s behalf. Their commitment to the future healthy and vitality of our oceans is greatly appreciated, as is yours.
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