Saving Seafood

Climate Change Looms as a Long-Term Threat to Aquaculture

November 16, 2018 — Aquaculture is on the rise in Massachusetts.  For many entering the business, shellfish farming seems like a more secure option than the marine fisheries.  But climate change looms as a long-term threat over the industry.

Paul Wittenstein always wanted to be a commercial fisherman.

Growing up in Harwich, he worked summer jobs at fish markets and on chartered fishing boats. In college, he started out studying fisheries technology, but it was a bad time for the industry. “All the while I was in school, I was watching the fishing industry struggling,” he said.  “I watched the cod disappear. I watched small boats battling big boats. At the same time, I saw this tiny little shellfish industry start to take hold.”

Read the full story on WCAI

New study: Chesapeake oyster decline not due to overfishing

November 14, 2018 — Warmer winters, rather than overharvesting, caused the steep decline of oysters and other commercially valuable shellfish in the Chesapeake Bay and elsewhere along the Atlantic coast, according to a controversial new study that’s getting pushback from some scientists.

The study, which appeared in Marine Fisheries Review, a quarterly journal of the National Oceanic and Atmospheric Administration, says that multi-year stretches of mild temperatures in normally weather months altered the food web in coastal waters. That impaired the growth and reproduction of oysters, quahogs, soft-shell clams and scallops, scientists said. It also led to increased predation on shellfish larvae and outbreaks of diseases.

“The temperatures got warm and that changed the whole environment, so [the oyster diseases] MSX and Dermo could flourish,” said Clyde MacKenzie, Jr., the study’s lead author and a longtime researcher at NOAA’s Northeast Fisheries Science Center at Sandy Hook, NJ. Mitchell Tarnowski, who runs the annual fall oyster survey for Maryland’s Department of Natural Resources, is the co-author.

The paper’s conclusions, especially its dismissal of overfishing as a factor in Chesapeake oyster declines, came under fire from scientists with the University of Maryland Center for Environmental Science and Chesapeake Bay Foundation. Its publication comes as the DNR prepares to release a first-ever stock assessment of the oyster population in the Upper Chesapeake, including an evaluation of whether current harvest levels are sustainable.

The scientific consensus has long been that overharvesting, disease and habitat loss over the decades devastated the Bay’s oyster population, with some estimates putting it in recent years at 1 percent or less of historic levels of abundance. From an annual commercial harvest of nearly 17 million bushels in 1880, landings have trended downward, hitting historic lows in 2003-04 of just 50,000 bushels. The harvest has rebounded some since then, though much of the gain has come via private oyster farming, especially in Virginia.

Read the full story at the Bay Journal

 

Scientists acknowledge key errors in study of how fast the oceans are warming

November 14, 2018 — Scientists behind a major study that claimed the Earth’s oceans are warming faster than previously thought now say their work contained inadvertent errors that made their conclusions seem more certain than they actually are.

Two weeks after the high-profile study was published in the journal Nature, its authors have submitted corrections to the publication. The Scripps Institution of Oceanography, home to several of the researchers involved, also noted the problems in the scientists’ work and corrected a news release on its website, which previously had asserted that the study detailed how the Earth’s oceans “have absorbed 60 percent more heat than previously thought.”

“Unfortunately, we made mistakes here,” said Ralph Keeling, a climate scientist at Scripps, who was a co-author of the study. “I think the main lesson is that you work as fast as you can to fix mistakes when you find them.”

The central problem, according to Keeling, came in how the researchers dealt with the uncertainty in their measurements. As a result, the findings suffer from too much doubt to definitively support the paper’s conclusion about how much heat the oceans have absorbed over time.

The central conclusion of the study — that oceans are retaining ever more energy as more heat is being trapped within Earth’s climate system each year — is in line with other studies that have drawn similar conclusions. And it hasn’t changed much despite the errors. But Keeling said the authors’ miscalculations mean there is a much larger margin of error in the findings, which means researchers can weigh in with less certainty than they thought.

“I accept responsibility for what happened because it’s my role to make sure that those kind of details got conveyed,” Keeling said.

The study’s lead author was Laure Resplandy of Princeton University. Other researchers were with institutions in China, Paris, Germany and the U.S. National Center for Atmospheric Research and Geophysical Fluid Dynamics Laboratory.

Read the full story at The Washington Post

N.C. governor calls for fishery disaster after Florence

November 14, 2018 — North Carolina Gov. Roy Cooper is seeking additional funding to help coastal communities deal with the damages weathered by the state’s fisheries following Hurricane Florence.

In a letter to Secretary Wilbur Ross, Cooper has asked the U.S. Department of Commerce to declare a federal fishery resources disaster.

“This was the storm of a lifetime for many coastal communities. The damaging economic impact to the state’s fisheries was, and continues to be, significant. While state appropriations will begin to afford some limited initial relief, much more is needed,” Cooper wrote in the letter.

According to the state Division of Marine Fisheries, the North Carolina commercial fishing industry generated more than $96 million in revenue in 2017. Declaring a federal fishery resource disaster can assist with long-term relief for commercial fishing families struggling to make a living while repairing their businesses. Hurricane Florence’s historic rainfall and powerful winds destroyed boats, gear and buildings critical to fishing businesses.

“Federal fisheries disaster assistance can provide the means to a longer-term recovery that North Carolinian fishermen so desperately need,” wrote Cooper.

Read the full story at National Fisherman

Ocean Shock: The climate crisis beneath the waves

November 13, 2018 — To stand at the edge of an ocean is to face an eternity of waves and water, a shroud covering seven-tenths of the Earth.

Hidden below are mountain ranges and canyons that rival anything on land. There you will find the Earth’s largest habitat, home to billions of plants and animals – the vast majority of the living things on the planet.

In this little-seen world, swirling super-highway currents move warm water thousands of miles north and south from the tropics to cooler latitudes, while cold water pumps from the poles to warmer climes.

It is a system that we take for granted as much as we do the circulation of our own blood. It substantially regulates the Earth’s temperature, and it has been mitigating the recent spike in atmospheric temperatures, soaking up much of human-generated heat and carbon dioxide. Without these ocean gyres to moderate temperatures, the Earth would be uninhabitable.

In the last few decades, however, the oceans have undergone unprecedented warming. Currents have shifted. These changes are for the most part invisible from land, but this hidden climate change has had a disturbing impact on marine life – in effect, creating an epic underwater refugee crisis.

Read the full story from Reuters at MSN

Why Is the Gulf of Maine Warming Faster Than 99% of the Ocean?

November 13, 2018 — Late last month, four endangered sea turtles washed ashore in northern Cape Cod, marking an early onset to what has now become a yearly event: the sea turtle stranding season.

These turtles—in last month’s case, Kemp’s ridley sea turtles—venture into the Gulf of Maine during warm months, but they can become hypothermic and slow moving when colder winter waters abruptly arrive, making it hard to escape.

“They are enjoying the warm water, and then all of a sudden the cold comes, and they can’t get out fast enough,” said Andrew Pershing, an oceanographer at the Gulf of Maine Research Institute in Portland, Maine.

Thanks to record-breaking summer water temperatures that quickly transition to cooler conditions, an expanded sea turtle stranding season is just one facet of a new normal for the Gulf of Maine, Pershing explained. And this new normal is a striking contrast to prior conditions.

This year, the Gulf of Maine has experienced only 45 days with what have not been considered heat wave temperatures. Such persistent warmth, scientists warn, can set off a series of other cascading effects on the marine life and fisheries that have historically defined the culture and economy of this region’s coastline.

Read the full story at Earth & Space Science News

Ruling Soon On New England Shrimp Fishery

November 8, 2018 — Fishing regulators are collecting the final comments from the public before deciding whether New England’s shrimp fishery should remain closed for another year.

Scientists and environmentalists have portrayed the shrimp fishery as a victim of climate change, as the warming temperature of the Gulf of Maine has made the shrimp’s habitat inhospitable. The fishery was shut down in 2013.

An arm of the Atlantic States Marine Fisheries Commission was collecting comments about possible new rules for the fishery, should it ever reopen, through 5 p.m. Wednesday. It’s expected to make a decision next week about whether to allow a fishing season in 2019.

Read the full story from the Associated Press at Maine Public

Ocean Shock: Fish Flee for Cooler Waters, Upending Lives in US South

November 7, 2018 — This is part of “Ocean Shock,” a Reuters series exploring climate change’s impact on sea creatures and the people who depend on them.

Creedence Clearwater Revival’s “Fortunate Son” drifts from Karroll Tillett’s workshop, a wooden shed about half a mile from where he was born.

Tillett, known as “Frog” to everyone here, has lived most of his 75 years on the water, much of it chasing summer flounder. But the chasing got harder and harder, and now he spends his time making nets for other fishermen at his workshop, at the end of a dirt path next to his ex-wife’s house.

The house is on CB Daniels Sr. Road, one of several named after two of the fishing clans that have held sway for decades in this small coastal town. Besides CB Daniels Sr. Road, there’s ER Daniels Road and just plain Daniels Road. In Frog’s family, there’s Tink Tillett Road and Rondal Tillett Road.

Once upon a time, these fishing families were pioneers. In the 1970s and 1980s, they built summer flounder into a major catch for the region. The 15 brothers and sisters of the Daniels clan parlayed the business into a multinational fishing company, and three years ago they sold it to a Canadian outfit for tens of millions of dollars.

But for Frog Tillett and almost everyone else in these parts, there’s not much money to be made fishing offshore here anymore.

Forty years ago, Tillett fished for summer flounder in December and January in waters near Wanchese, then followed the fish north as the weather warmed. In recent years, however, fewer summer flounder have traveled as far south in the winter, and the most productive area has shifted north, closer to Martha’s Vineyard and the southern shore of Long Island.

Reuters has spent more than a year scouring decades of maritime temperature readings, fishery records and other little-used data to create a portrait of the planet’s hidden climate disruption — in the rarely explored depths of the seas that cover more than 70 percent of the Earth’s surface. The reporting has come to a disturbing conclusion: Marine life is facing an epic dislocation.

Read the full story from Reuters at Voice of America

Study says ocean oscillation changes reduced shellfish landings

November 6, 2018 — For years, Maine shellfish harvesters have been complaining that there are fewer softshell clams while arguing that the diggers who go out on the mud flats aren’t the cause of the problem.

A recent study by researchers from NOAA’s Northeast Fisheries Science Center and the Maryland Department of Natural Resources backs them up on both counts.

According to Clyde L. MacKenzie Jr. of NOAA and Mitchell Tarnowski from the Maryland Department of Natural Resources, between 1980 and 2010, documented landings of the four most commercially important inshore bivalve mollusks along the Northeast coast — eastern oysters, northern quahogs, softshell clams and northern bay scallops — dropped by 85 percent.

The principal cause, they say, was warming ocean temperatures associated with a shift in the North Atlantic Oscillation which resulted in damaged shellfish habitat and increased predation from Maine to North Carolina.

“My first response is that the article confirms what I have been seeing with soft-shell clams over at least the last decade or so,” Brian Beal, a professor of marine ecology at the University of Maine Machias and director of research at the Downeast Institute on Great Wass Island, said last week.

The North Atlantic Oscillation is a fluctuation of atmospheric pressure over the North Atlantic that affects both the weather and the climate along the East Coast, especially in winter and early spring.

According to NOAA, shifts in the oscillation can affect the timing of a species’ reproduction and growth, the availability of microscopic organisms for food and predator-prey relationships.

Over a period of several years, MacKenzie and Tarnowski interviewed shellfish wardens and harvesters along the New England coast, as well as examining landings records and other research in an effort to determine the “true causes” of the precipitous drop in shellfish landings.

Read the full story at The Ellsworth American

Earth’s oceans may be way hotter than scientists realized — here’s how worried you should be

November 2, 2018 — The oceans are the world’s thankless, built-in air purifiers.

Over the past couple hundred years, as humans have burned coal, cleared forests, put gas-powered cars and trucks on the road, and run air conditioners and refrigerators, the oceans have been quietly gathering up most of the carbon emissions those activities spew into the air. They’ve also absorbed most of the excess heat that those gases have trapped on the planet.

Previous estimates suggested that the world’s oceans have collectively taken in more than 90% of the excess heat energy that our carbon emissions have kept on Earth.

But a new report published in the journal Nature on Wednesday suggests it’s worse than that. The research shows that scientists have been measuring the amount of heat in the oceans incorrectly, so the waters have actually absorbed far more heat than previously thought.

“If we think the ocean is warming more than we thought, it means the Earth is warming more than we thought, and that means the Earth is more sensitive to our emissions,” lead study author Laure Resplandy, an assistant professor of geosciences at Princeton, told Business Insider.

Scientists have long warned that we have to curb our reliance on fossil fuels to avoid a future of regular, catastrophic climate disasters. But Resplandy said the new findings in her report show that avoiding a future “Hothouse Earth” scenario will be even harder than anticipated. Specifically, that means it will be more challenging to avoid flooding from sea level rise in coastal cities, violent hurricanes, and the death of nearly all of Earth’s coral reefs.

Read the full story at MSN