Saving Seafood

Evidence Bolsters Classification of a Major Spawning Ground for Atlantic Bluefin Tuna Off the Northeast U.S.

March 4, 2022 — The Slope Sea off the Northeast United States is a major spawning ground for Atlantic bluefin tuna (Thunnus thynnus), a new paper affirms. This finding likely has important implications for population dynamics and the survival of this fish, according to the paper, “Support for the Slope Sea as a major spawning ground for Atlantic bluefin tuna: evidence from larval abundance, growth rates, and particle-tracking simulations,” published in the Canadian Journal of Fisheries and Aquatic Sciences.

“Overall, our results provide important supporting evidence that the Slope Sea is a major spawning ground that is likely to be important for population dynamics,” the paper states. Spawning in the Slope Sea “may offer the species additional resilience in the face of both harvesting and climate change,” the paper adds.

The paper presents larval evidence supporting the recognition of the Slope Sea as a major spawning ground, including that larvae collected in the Slope Sea grew at the same rate as larvae collected in the Gulf of Mexico, indicating that this region is good larval habitat.

“In comparison to everything else we know about this species, the Slope Sea is a perfectly good place to be born as a larva,” said lead author Christina Hernández, who was a doctoral student in the Massachusetts Institute of Technology (MIT) – Woods Hole Oceanographic Institution (WHOI) Joint Program in Oceanography/Applied Ocean Science and Engineering at the time of the study.

Read the full story at the Woods Hole Oceanographic Institution

As bluefin recover, a new fight about how to fish for them

September 30, 2019 — A federal plan that could loosen the rules about fishing for one of the most debated species in the ocean has attracted the attention of fishermen and environmentalists, some of whom fear years of conservation work could be undone.

Preservation of the Atlantic bluefin tuna has long been a subject of international debate, and sometimes discord. The giant sushi fish, which occasionally sell for more than $1 million and often weigh several hundred pounds, are at a fraction of historical population levels but have shown positive signs in recent years.

The federal government is considering some changes to the way the fish are managed. The National Oceanic and Atmospheric Administration has said some of the changes would give fishermen who use longlines, a method of fishing used to catch large fish, more flexibility by increasing their amount of open fishing area, including in the Gulf of Mexico.

The Gulf of Mexico is a critical spawning area for bluefin, and parts of it are closed down to longliners in the spring to protect the fish. Reopening it to fishing could jeopardize the bluefin stock in U.S. waters and beyond, said Shana Miller, senior officer for international fisheries conservation with the Ocean Foundation.

Read the full story from the Associated Press at the Gloucester Daily Times

Pew: Atlantic bluefin not ready for MSC certification

August 31, 2018 — The Pew Charitable Trusts has come out in opposition to a Japanese company’s attempt to get its Atlantic bluefin tuna longline fishery certified by the Marine Stewardship Council.

Last week, the council announced Usufuku Honten Co. Ltd. began the assessment process for the voluntary certification. It marked the first bluefin fishery to be assessed. Control Union Pesca Ltd. will perform the independent review, focusing on the Dai-ichi Shofuku-maru. The ship, which stays in the Atlantic Ocean all year, catches bluefin in October and November annually.

MSC certification is being sought because its process is designed to acknowledge fisheries that meet sustainable fishing management standards, Usufuku Honten said. The council, founded in 1997, has certified 296 fisheries located in 35 countries through its first 20 years of existence. That represents about one-eighth of the worldwide marine harvest. More than 38,000 groceries, restaurants, hotels, and other sites have also been certified to see the more than 25,000 products that come adorned with MSC’s blue label.

Read the full story at Seafood Source

 

A controversial comeback for a highly prized tuna

August 29, 2018 — SOUTH PORTLAND, Maine — On a drizzling summer afternoon in South Portland, marine biologist Walt Golet is helping attach a quarter-ton Atlantic bluefin tuna to a heavy crane so it can be weighed as part of New England’s premier tournament for the giant fish. And this year’s derby is different than many in the past — there are far more tuna.

A decade ago, participants in the Sturdivant Island Tuna Tournament went consecutive years in which they didn’t catch a single fish in the Gulf of Maine. This year, fishermen set a record with 30, including the 801-pound (363.33-kilogram) winner.

Their record haul is happening amid a turning point for these giant tuna, an iconic species that scientists say appears to be slowly recovering in the Atlantic Ocean. The reemergence of bluefin, which can weigh more than half a ton, has led to debate among fishermen, conservationists and scientists over just how much the big fish have recovered. It remains at a fraction of its population 60 years ago.

“There’s probably no fish that’s ever been more politicized than Atlantic bluefin tuna,” said Golet, a University of Maine professor. “People get a passion for this fish. And people are making a living off of this fish.”

The fish have long been at the center of a battle among commercial fishermen who can make a huge amount of money on a single fish, environmentalists who see them as marvels of marine migration, and consumers who pay a hefty price for them in restaurants.

Read the full story from the Associated Press at The Washington Post

Nations decide to increase quota for Atlantic Bluefin tuna

November 22, 2017 — MARRAKECH, Morocco — Countries fishing the eastern Atlantic and the Mediterranean agreed Tuesday to expand the annual quota for prized bluefin tuna to reflect an improvement in their stocks. Environmentalists insisted the increase was excessive.

The 50-nation International Commission for the Conservation of Atlantic Tunas agreed to increase the quota from 24,000 tons this year to 28,000 next year, with a further 4,000 tons added in each of the following two years.

The decision means the quota has more than doubled from five years ago, when once depleted stocks of bluefin tuna first started showing the potential of a recovery.

Read the full story from the Associated Press at the Boston Globe

Atlantic Bluefin Tuna Stocks Are Rebounding — But How High Should The Quota Be Raised?

November 7, 2017 — PORTLAND, Maine — Fishermen up and down the New England coast say it has been decades since they’ve been able to catch so many Atlantic bluefin tuna, so fast. Once severely depleted, populations of the prized sushi fish appear to be rebuilding.

Now the industry and some scientists say the international commission that regulates the fish can allow a much bigger catch. But some environmental groups disagree.

Peter Speeches is a commercial fisherman who sails his 45-foot boat, the Erin & Sarah, out of a Portland marina. His rods and reels are racked, though, and the boat has been docked the past several weeks. That’s because tuna fishermen reached their fall catch quotas earlier than ever this year.

“There was more fish here than I’ve seen in 30 years, and I fish virtually every single day. This year we caught probably the same amount, but in half the time,” he says.

This year, Speeches says, the thousand-plus boats that fish bluefin off New England were blessed by day after day of good boating weather. Forage fish such as herring and pogies showed up in numbers — and they swam relatively near to shore, bringing the big tuna in to feast, where smaller boats could get at them pretty easily.

Above all, he says, there were just a whole lot of bluefin around, and biting.

“They were everywhere. When they hit this year in July, they hit from the Canadian border to New Jersey, and they were thick. And they got caught fast,” Speeches says.

Read and listen to the full story at Maine Public

Tuna lab leaving Gloucester, Mass.

Lutcavage, colleagues to work out of UMass Boston

October 6, 2017 — For the first time in almost seven years, the highly-regarded Large Pelagics Research Center affiliated with the University of Massachusetts no longer has a Gloucester address.

The center, which has performed groundbreaking and internationally acclaimed research on the spawning habits and habitats of Atlantic bluefin tuna, closed up shop Thursday at its most recent home — the Americold-owned building at 159 E. Main St. in East Gloucester.

Americold has been actively shopping the site for months and recently informed the center it would have to vacate its office space by the end of October. Molly Lutcavage, the founder and executive director of the center, and Tim Lam, an assistant research professor, didn’t bother waiting until the end of the month.

“It’s sad to think that we won’t have a Gloucester presence anymore,” Lutcavage said. “For now, I guess we’ll be working out of our houses and garages.”

The center has been forced to navigate some rough seas in the past few years, changing its affiliation within the University of Massachusetts system and being forced out of its original facility at Hodgkins Cove, where it had been housed since 2011.

Read the full story at the Gloucester Times

UMaine to Receive More Than $220K From NOAA to Study Tuna

August 11, 2017 — ORONO, Maine — The University of Maine is slated to receive more than $220,000 from the federal government to support research of Atlantic bluefin tuna.

Republican Sen. Susan Collins and independent Sen. Angus King say the money from the National Oceanic and Atmospheric Administration will help with UMaine’s research about the tuna’s age, growth and population in the northwest Atlantic Ocean.

UMaine researchers will work with dealers, fishermen and other stakeholders from Maine to North Carolina on the work.

Read the full story from the Associated Press at the U.S. News & World Report

Regulators changing fishing rules to protect endangered tuna

January 4, 2017 — PORTLAND, Maine — The federal government is changing some of the rules about how fishermen harvest tuna in an attempt to protect one of the species of the fish.

The National Marine Fisheries Service says the rule change is designed to steer fishermen who catch yellowfin tuna and swordfish via longline away from bluefin tuna.

Atlantic bluefin tuna are listed as endangered by the International Union for Conservation of Nature. Fishing boats sometimes catch them incidentally while targeting other species.

The fisheries service says the rule change will modify the way it handles distribution of quota transfers in the longline tuna fishery. The service says that flexibility will improve fishing opportunities while limiting the number of bluefin tuna that are incidentally caught.

Read the full story at The Washington Post

Tuna’s Declining Mercury Contamination Linked to U.S. Shift Away from Coal

November 23, 2016 — Levels of highly toxic mercury contamination in Atlantic bluefin tuna are rapidly declining, according to a new study. That trend does not affect recommended limits on consumption of canned tuna, which comes mainly from other tuna species. Nor does it reflect trends in other ocean basins. But it does represent a major break in the long-standing, scary connection between tuna and mercury, a source of public concern since 1970, when a chemistry professor in New York City found excess levels of mercury in a can of tuna and spurred a nationwide recall. Tuna consumption continues to be the source of about 40 percent of the mercury contamination in the American diet. And mercury exposure from all sources remains an important issue, because it causes cognitive impairment in an estimated 300,000 to 600,000 babies born in this country each year.

The new study, published online on November 10 by Environmental Science & Technology, links the decline directly to reduced mercury emissions in North America. Most of that reduction has occurred because of the marketplace shift by power plants and industry away from coal, the major source of mercury emissions. Pollution control requirements imposed by the federal government have also cut mercury emissions.

Progress on both counts could, however, reverse, with President-elect Donald Trump promising a comeback for the U.S. coal industry, in part by clearing away such regulations.

For the new study, a team of a half-dozen researchers analyzed tissue samples from nearly 1,300 Atlantic bluefin tuna taken by commercial fisheries, mostly in the Gulf of Maine, between 2004 and 2012. They found that levels of mercury concentration dropped by more than 2 percent per year, for a total decline of 19 percent over just nine years.

Read the full story at Scientific American