Blog Tags: Sea Turtles
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.
Yesterday afternoon the California Fish & Game Commission voted unanimously to support legislation to designate the Pacific leatherback sea turtle as the state’s official marine reptile.
The Commission often does not take a position on legislation, making yesterday’s decision an even stronger statement as to the importance of California waters to leatherback sea turtles.
Support from the Commission is expected to help push the legislation (Assembly Bill 1776) through the Senate and eventually to the Governor’s desk, where Jerry Brown has until September 30th to sign new bills into law.
The largest of six species of sea turtles in US waters, the leatherback makes an impressive migration from its nesting beaches in Papua, Indonesia to California waters to feed on jellyfish. Its 12,000 mile, round-trip journey is the longest of any marine reptile.
Pacific leatherbacks are listed on the Endangered Species List with as few as 2,100 adult female leatherback sea turtles remaining in the Pacific Ocean population. In January, 16,910 square miles off California’s coast were designated by the National Marine Fisheries Service as critical habitat for the leatherback.
AB 1776 will be heard next in the Senate Committee on Governmental Organization. Stay tuned!
Kinsey is best known for her role as the tightly-wound head of accounting on “The Office,” and she also appeared in a video for Oceana’s sea turtle campaign alongside Rachael Harris (“The Hangover.) Kinsey will be joined by sustainable chef and author Barton Seaver and Oceana campaign director Beth Lowell. Their stops will include a briefing on Capitol Hill and a reception at National Aquarium.
Oceana has found mislabeling of nearly one in five fish fillets sampled in Boston-area supermarkets, as well as the mislabeling of more than half of the seafood sampled in the Los Angeles-area. Oceana is calling on the federal government to make combating seafood fraud a priority as well as for traceability of seafood sold in the United States.
More good news for sea turtles today: The endangered leatherback sea turtle swam one lap closer today to becoming California’s official marine reptile.
The California Assembly Committee on Water, Parks, and Wildlife voted unanimously today that this ocean ambassador should be an additional state symbol. This is exciting news as the bill heads next to the Assembly floor where all 80 Assemblymembers will vote to determine if the bill moves to the state Senate.
Leatherbacks are truly an impressive species and an important part of the marine ecosystem. Once they reach maturity, leatherback sea turtles swim over 6,000 miles from their nesting beaches in Indonesia, Papua New Guinea, and the Solomon Islands to waters off California’s coast to feed on jellyfish.
California waters are a globally important foraging area for leatherbacks and these endangered species are an ecologically important part of the marine ecosystem. In recognition of new scientific information demonstrating the importance of California waters to the survival of Pacific leatherbacks, the National Marine Fisheries Service recently designated nearly 42,000 square miles off the US West Coast as critical habitat, including 16,910 square miles off California’s coast.
Oceana co-authored the petition and weighed in heavily during this 5 year process leading to the final designation to help ensure ensure these awe-inspiring animals are not wiped out by human impacts to their key feeding areas.
Thank you to all of you California Wavemakers who signed the letter of support to your local representative letting them know your support for this legislation. This is truly a time to celebrate the leatherback.
We’re happy to announce a victory for sea turtles in the Atlantic this week.
The scallop fishery has long been a threat to sea turtles, who get caught up and drowned in the heavy equipment. Scallops are often collected by dredges— heavy metal nets attached to a flat scoop that drags along the ground, collecting everything large enough to fit in the net. These dredges are hazards in sea turtle habitats, where they catch, drag, and drown sea turtles along with the desired scallops.
All six sea turtle species in the United States are threatened or endangered under the Endangered Species Act, making these deaths all the more tragic.
Fortunately, there’s a new type of gear that includes something called a Turtle Deflector Device (TDD). With a TDD, dredges can push sea turtles out of harm’s way instead of pulling them into the nets.
This week, the National Marine Fisheries Service (NMFS) announced new regulations for the Atlantic scallop fishery that will require TDDs in areas and during times when sea turtles are known to be present.
We are excited about these new rules, which will save many sea turtle lives.
Gib Brogan, our Northeast representative, said that “Oceana is relieved that after 10 years of requests, NMFS has finally taken action to reduce the scallop fishery’s deadly interaction with threatened sea turtles. We support TDDs as a solution to sea turtle bycatch in the scallop fishery and commend the industry and its research partners for their work to develop this new gear.”
Each of the six sea turtle species found in the United States are listed as endangered or threatened under the Endangered Species Act. Every day, sea turtles face a number of threats including pollution, boat strikes, hunting, accidental capture by fisheries, as well as the development of many coastal beaches that female sea turtles use for nesting sites.
But a growing threat to sea turtles is climate change. Rising sea levels and increased numbers of storms will likely limit the number of beaches that are suitable for nesting, and warmer temperatures could have a significant effect on sea turtle reproduction since the sex of sea turtle eggs is determined by the nest temperature. Warmer sands will result in more females, while cooler sands favor males. The magic temperature seems to be about 82°F, but this can vary depending on the species.
Temperatures are predicted to rise by 2.5-10°F in the next century, which could alter hatchling sex ratios especially in areas that are already warm like the Caribbean. In Florida, loggerhead nests are already producing more than 90% females, and further warming could mean that no males hatch from these nests at all.
In a new study, however, a group of researchers used screens to shade nests, and they found that it effectively reduced nest temperatures and produced a higher proportion of male hatchlings. By protecting beaches where males are more common and by applying artificial shading, if necessary, a healthy ratio of male and female sea turtles will be born.
Although shading may provide some relief to sea turtle populations already threatened with extinction, it is only a temporary solution to a much larger problem. To help take action against climate change, here are a few steps you can take at home and in your community.
When sea turtles are sick or injured, they can spend a few weeks or months recovering in sea turtle rehabilitation or research centers. The turtles are released back into the wild as soon as they have recovered enough so that they can live normally in the ocean.
But sometimes, sea turtles spend years or even decades away from the ocean. Still, even after sea turtles have spent long periods of time in captivity, they are able to return to the ocean and live like a wild turtle – even following complex migration routes.
Wild sea turtles migrate long distances to reproduce, as females return to the same beach where they hatched in order to lay their own eggs. Sometimes, these turtles cross entire oceans to get back to the beach where they were born. These long journeys inspired the Great Turtle Race, where leatherback sea turtles were tracked as they crossed the Pacific Ocean to nest.
Although not all sea turtles can be released from rehabilitation, healthy turtles that have spent a long time in captivity can still easily adapt back to ocean living. In 1996, researchers released a female loggerhead named Adelita, who had been raised in captivity for 10 years.
Researchers attached a satellite tracking device and were able to follow her incredible journey from Baja California to nesting sites in Sendai Bay, Japan – over 7,000 miles away! Even though she had spent her entire life in a research facility, she was still able to find her way to the area where she hatched.
Andy Sharpless is the CEO of Oceana.
I’m pleased to report two victories this week for some of the oceans’ most threatened creatures.
First, Oceana and its allies won protections for endangered Pacific leatherback sea turtles with the establishment of the first permanent safe haven for leatherbacks in the continental U.S. The area, nearly 42,000 square miles off the U.S. West Coast, protects the places where leatherbacks feed on jellyfish after swimming 6,000 miles across the ocean from Indonesia in one of the world’s greatest migrations.
Second, the U.S. District Court ruled in favor of protections for endangered Steller sea lions. These majestic marine mammals compete with large-scale industrial fisheries for food and continue to struggle for survival in the western Aleutian Islands.
The court decision came after Oceana and our allies pressured the federal government to address the declining Steller sea lions’ population by limiting bottom trawling in important areas. In 2010, the government agreed that existing protections were not adequate and put in place new rules to allow more food for sea lions in the Aleutian Islands.
Naturally, the fishing industry was displeased and sued to invalidate the closure. Oceana, Greenpeace and Earthjustice teamed up with the government to uphold the protections, and we learned yesterday that we won.
Thanks to this decision, Steller sea lions will continue to have a chance to rebound. There is still more work to be done, though, because the court required the government to conduct a new analysis of the impacts of its decision. This process should help us better understand the effects of large-scale commercial fishing on sea lions and other ocean resources.
Thanks you for the support that makes these victories possible.
As of today, the ocean’s largest sea turtle now has 41,914 square miles of Pacific Ocean it can call its own.
Oceana has been working for five years to protect habitat critical to the survival and recovery of the endangered Pacific leatherback sea turtle, and it paid off. Thanks to a decision by the National Marine Fisheries Service, these magnificent reptiles will now be safeguarded off the U.S. West Coast.
Leatherback sea turtles migrate from Papua, Indonesia to the U.S. West Coast every summer and fall to feed on jellyfish — a 12,000-mile round-trip journey that is the longest known migration of any living marine reptile.
Sadly, these navigators encounter a gauntlet of threats as they make their journey across the Pacific such as poaching; ingestion of plastic bags which they mistake for their favorite food, jellyfish; and entanglement and drowning in longline and gillnet fishing gear.
Due to these threats Pacific leatherbacks have declined more than 95 percent since the 1980s and as few as 2,300 adult female western Pacific leatherbacks remain. There have already been localized extinctions of leatherback sea turtles in India and the Sri Lanka and Malaysian populations have nearly disappeared.
Leatherbacks from Papua, Indonesia and those that feed off the U.S. West Coast, are one of the turtle’s last strongholds in the Pacific Ocean. It is heartbreaking to think that a species that has been swimming the world’s oceans for more than 100 million years could indeed be wiped out by human actions.
Fishing gear should be killing fewer sea turtles, not more – and today we filed a complaint with the government saying just that.
Oceana’s complaint is in response to the U.S. government’s decision in October 2010 to allow eight East Coast fisheries to harm 14 times more threatened loggerhead sea turtles – raising the limit from 42 to 610.
Oceana is disputing the U.S. government’s decision to allow these fisheries to injure and kill more loggerhead sea turtles without adequately assessing the aggregate impacts of the fisheries on this species. The fisheries harm leatherback, Kemp’s ridley, and green sea turtles as well, and those species also would benefit from proper assessments of the fisheries’ impacts.
Oceana’s complaint addresses eight federal fisheries, including those for monkfish and for summer flounder, scup and black sea bass, which are responsible for the highest levels of sea turtle bycatch in the region.
Oceana is calling on the U.S. to implement simple solutions to protect and restore sea turtle populations in the Atlantic, including turtle escape hatches in trawls, adopting adequate monitoring of fisheries that catch sea turtles, capping the allowable catch of sea turtles and where necessary, closing areas for fishing when and where sea turtles are present.
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