Saving Seafood

Changing climate to put further pressure on New England, federal report predicts

November 26, 2018 — New England’s forests, fisheries and cultural traditions are already experiencing significant disruptions from a changing climate and will face additional transformation over the coming decades, according to a federal report released Friday.

Northeastern states are seeing some of the largest changes in the nation, yet conditions are shifting even faster in New England than the region as a whole, in some instances. Annual average temperatures in New England, for example, rose by roughly 3 degrees since the beginning of the last century compared to 1.8 degrees in the contiguous United States.

Those temperature changes – combined with shifts in precipitation levels and rapid warming in the Gulf of Maine – will continue to impact the health, economy and aging infrastructure of the region.

“For example, because much of the historical development of industry and commerce in New England occurred along rivers, canals, coasts, and other bodies of water, these areas often have a higher density of contaminated sites, waste management facilities, and petroleum storage facilities that are potentially vulnerable to flooding,” reads the report from 13 federal agencies.

“As a result, increases in flood frequency or severity could increase the spread of contaminants into soils and waterways, resulting in increased risks to the health of nearby ecosystems, animals, and people – a set of phenomena well documented following Superstorm Sandy,” the report says.

While the political debate over climate change continues, there is little doubt among fishermen or the scientists who work with them that the Gulf of Maine is changing. Maine fishermen now routinely see species once found only in southern or mid-Atlantic states while stocks of northern shrimp and cod have been depleted or moved north to cooler waters.

The report cited numerous examples of New England fishermen attempting to adapt to those changes and acknowledged that the arrival of new species will create new opportunities. But the authors also warned that markets, shoreside infrastructure as well as regulatory restriction on what fishermen can catch are often slower to respond.

Scientists also predict that species particularly important to New England face a bleaker future because of rising acidity levels as the oceans absorb more carbon dioxide from the atmosphere.

Read the full story at the Portland Press Herald

California Creates Plan to Curb Ocean Acidification

October 30, 2018 — California officials have created a plan to stop climate change from killing sea creatures and protect the state’s $45 billion ocean-based economy.

Deborah Halberstadt with the California Ocean Protection Council said the ocean is getting more acidic as it absorbs increased amounts of carbon dioxide, which can threaten species key to the fishing industry.

“With climate change we’re seeing warmer oceans. It’s actually changing the chemistry of the ocean water and making it more corrosive,” Halberstadt said. “This has the impact of potentially destroying the bottom layer of the food web.”

Concern began when oysters started dying in the Pacific Northwest.

“The animals can’t develop shells because the water is too acidic and so then they either die or become deformed,” said Halberstadt.

The state’s first California Ocean Acidification Action Plan will analyze and identify the full risk. State officials are worried about the Dungeness crab and salmon populations.

Read the full story at Capital Public Radio

MASSACHUSETTS: New commission created to study ocean acidificaton

October 18, 2018 — David Ryan and Al Suprenant have a lot invested in their business.

The co-owners of Cape Cod Oyster Co. in Marstons Mills have eight full-time employees working 54 acres of ocean bottom on three sites; a 4,000-square-foot processing plant, two truck drivers, two bookkeepers, a fleet of refrigerated box trucks and five 28-foot vessels.

It takes careful planning, and a steady supply and demand for their product to keep it all rolling. They dread the reversals of fortune nature can dole out, such as occurred during a sudden onslaught of ocean acidification in the Pacific Northwest a decade ago that caused a 70 percent to 80 percent die-off of oyster larvae in Washington state hatcheries. One-quarter of the carbon in the atmosphere is absorbed by the ocean, forming an acid that inhibits shell building, particularly in larvae. Since the beginning of the industrial era 525 billion tons of carbon dioxide has been absorbed by the ocean, 22 million tons per day, according to a Smithsonian report.

“The West Coast was taken completely by surprise,” Ryan said Tuesday.

Washington was the largest aquaculture industry in the country with over 3,000 jobs but half the state’s production and hundreds of employees had to be relocated to Hawaii to avoid the acidic water that was delivered to the coastline by a slow-moving current.

Avoiding that kind of surprise in Massachusetts — where the aquaculture industry produced $28 million of oysters and other shellfish in 2017 — and in Barnstable County — with 270 licensed growers who produced over $12 million worth of shellfish — is why Ryan and Suprenant supported state Sen. Julian Cyr, D-Truro, and state Rep. Dylan Fernandes, D-Woods Hole, in their pursuit of legislation to create an Ocean Acidification Commission in the Bay State.

The commission is intended to foster research as well as legislative and other solutions to a problem often described as the evil twin of the global warming caused by climate change. On Tuesday, Cyr and Fernandes chose Cape Cod Oyster Co. headquarters to announce the official launch of the acidification commission, which was authorized under the latest state environmental bond bill this summer.

“This is a real challenge for our burgeoning aquaculture industry,” Cyr said, promising to leverage the power of state agencies, the wealth of research being done by the National Oceanic and Atmospheric Administration, Woods Hole Oceanographic Institution and Marine Biological Laboratory in Woods Hole, and the fishing industry to offset the effects of ocean acidification.

It’s not just aquaculture in state waters, but larger federal fisheries that are potentially in peril, including sea scallops and lobsters. Massachusetts harvested 29.2 million pounds of sea scallops in 2016 worth over $350 million. State lobstermen caught 17.7 million pounds of lobster worth $82 million.

The problem has not been well publicized because the effects occur out of sight, said Laurence Madin, WHOI vice president of research.

Read the full story at the Cape Cod Times

Scallop fishery may be imperiled by acidic seas

October 16, 2018 — Increasingly acidic seas pose a serious threat to the sea scallop fishery, a recent collaborative study by the University of Virginia, the Ocean Conservancy, the NOAA Northeast Fisheries Science Center, and the Woods Hole Oceanographic Institution (WHOI) concluded.

“As levels of carbon dioxide increase in Earth’s atmosphere, the oceans become increasingly acidic — a condition that could reduce the sea scallop population by more than 50 percent in the next 100 years under a worst-case scenario,” the study states. Models from the study, which were published recently in the journal PLOS One, combine existing data with several factors that impact the fishery: “future climate change scenarios, ocean acidification impacts, fisheries management policies, and fuel costs for fishermen.” Those factors were modeled out into 256 different possibilities.

Oceans absorb vast quantities of carbon dioxide. Fossil fuel emissions exacerbate what the oceans take in, further acidifying the water. “That acidity can corrode the calcium carbonate shells that are made by shellfish like clams, oysters, and scallops, and even prevent their larvae from forming shells in the first place,” the study states.

“[The scallop fishery is] healthy and valuable today in part because it is very well managed,” says Scott Doney, a co-author from WHOI and the University of Virginia. “We also used the model to ask whether management approaches could offset the negative impacts of ocean acidification.”

It couldn’t. In every scenario, elevated carbon dioxide levels created acidiferous ocean water. The culprit, the study concluded, was “unabated carbon emissions.”

Read the full story at the MV Times

New Study Shows Climate Change Could Reduce Scallop Population

October 3, 2018 — Researchers in Massachusetts say under the worst case scenario, climate change could reduce the scallop population by more than 50 percent in just a few decades, which could be bad news for New Bedford’s lucrative fishing port.

In 2016, commercial fishermen landed more than $300 million worth of fish at the Port of New Bedford, and 85 percent of that value came from scallops.

A new study from Woods Hole Oceanographic Institution shows as carbon emissions in the atmosphere increase, so does the acidity in the ocean.

Jennie Rheuban, lead author of the report, said that could affect how well scallops can grow.

“Adults may actually be growing slower and calcifying less quickly under these acidified conditions because it’s more difficult for them to lay down calcium carbonate as a shell,” Rheuban said.

Rheuban said ocean acidification could also cause scallops to become more vulnerable.

“They aren’t able to swim quite as well when they’re experiencing acidified conditions, and so we hypothesize that under acidification, scallops may be more susceptible to predation,” she said.

Read the full story at Rhode Island Public Radio

New model looks at ocean acidification and sea scallop population drop

September 28, 2018 — Scientists at the University of Virginia and the Woods Hole Oceanographic Institution have created a new model looking at ocean acidification.

According to a release, fishermen harvest more than $500 million worth of Atlantic sea scallops each year off the East Coast, but this model predicts those fisheries may be in danger.

It says, as the levels of carbon dioxide increase in the atmosphere, the oceans become increasingly acidic, which could reduce the sea scallop population by more than 50 percent in the next 100 years, as a worst-case scenario.

The researchers say strong fisheries management and efforts to reduce CO2 emissions might slow or potentially even stop the trend.

“Rising atmospheric carbon dioxide levels pose a threat to many types of marine life, particularly shellfish,” said Scott Doney, an environmental sciences professor at UVA. “The ocean removes about a quarter of the carbon dioxide humans release to the atmosphere each year from fossil fuel use and deforestation. The resulting acidification of seawater makes it more difficult for shellfish like scallops and clams to build and maintain their shells.”

There are currently no studies that have been published showing the specific effects of ocean acidification on the Atlantic sea scallop, so to estimate the impact, Doney and his colleagues used a range of effects based on studies of related species.

The release says the new models lets scientists explore how plausible impacts of ocean acidification may change the future of the scallop population.

The researchers tested four different levels of impact on each of four different factors in the model, creating 256 different scenario combinations.

Read the full story at WCAV

WHOI Warns Sea Scallop Fisheries of Rises in Ocean Acidification

September 26, 2018 — More than $500 million worth of Atlantic sea scallops are harvested off the east coast of the United States.

Scientists at the Woods Hole Oceanographic Institution (WHOI), however, warn that fisheries bringing in this massive catch might be in danger because of carbon-dioxide levels increasing in the Earth’s atmosphere, causing the upper oceans to become increasingly acidic.

“What’s novel about our work is that it brings together models of changing ocean environments as well as human responses. It combines socioeconomic decision making, ocean chemistry, atmospheric carbon dioxide, economic development and fisheries management, said the study’s lead author Jennie Rheuban.

“We tried to create a holistic view of how environmental changes might play out across different aspects of the sea scallop fishery.”

The scientists say the condition could reduce the sea scallop population by more than 50-percent within the next 30 to 80 years.

The predictions were made using a model created by WHOI scientists, which combines existing data and models of four major factors: future climate change scenarios, ocean acidification impacts, fisheries management policies, and fuel costs for commercial fishermen.

WHOI says that the ocean absorbs more than a quarter of all carbon dioxide in the atmosphere. They say that the acidity caused by this can corrode the shells of clams, oysters, and scallops, and event prevent their larvae from forming shells at all.

Read the full story at CapeCod.com

Warming seas are robbing some fish of their vital sense of smell

August 6, 2018 — There have been numerous wake-up calls about the effects of climate change on marine life. As ocean waters heat up, they are bleaching corals. Growing levels of carbon dioxide are acidifying seawater, which is degrading the shells and skeletons of sea organisms. The rising temperatures are prompting fish to migrate to colder waters, even causing them to shrink.

Now climate change is starting to affect their sense of smell, a phenomenon that will worsen in the coming years if global warming continues unabated, according to new research. A sense of smell is indispensable to fish. They use it to find food, detect imminent danger and elude predators, to find safe environments and spawning areas, even to recognize one another.

To lose it could threaten their very survival. If this happens, it also would mean big trouble for the fishing industry, tourism and, most importantly, global nutrition, since many of the world’s people — including its poorest — depend on fish for food.

“Future levels of carbon dioxide can have large negative effects on the sense of smell of fish, which can affect fish population numbers and entire ecosystems,” said Cosima Porteus, a researcher at the University of Exeter and author of the study, which appears in the journal Nature Climate Change.

“This can be prevented, but we must reduce carbon emissions now before it’s too late,” Porteus says.

Carbon dioxide combines with seawater to produce carbonic acid, which makes the water more acidic. Since the Industrial Revolution, oceanic CO2 has risen by 43 percent and is projected to be two and a half times current levels by the end of this century, according to the scientists.

Read the full story at Popular Science

The Ocean Is Getting More Acidic —What That Actually Means

June 18, 2018 — Grace Saba steadies herself on the back of a gently rocking boat as she and her crew slide a six-foot long yellow torpedo into the sea. A cheer erupts as the device surfaces, turns on its electronic signal, and begins a three-week journey along the New Jersey coast.

“It’s taken seven years to get this done,” said Saba, who has been working on this experiment since 2011. “I’m so happy, I think I might cry!”

Saba is an assistant professor of marine ecology at Rutgers University, where she is studying how fish, clams, and other creatures are reacting to rising levels of ocean acidity. Acidification is a byproduct of climate change; a slow but exorable real-life experiment in which industrial emissions of carbon dioxide into the atmosphere are absorbed and then undergo chemical reactions in the sea. Rising ocean acidity has already bleached Florida’s coral reefs and killed valuable oysters in the Pacific Northwest.

Now scientists like Saba want to know what might happen to animals that live in the Northeast, a region home to commercially important fishes, wild stocks of quahogs (clams), scallops, and surf clams that can’t swim away from growing acidic waters.

“They are just stuck there,” Saba said.

Saba’s torpedo-like instrument is actually an underwater drone, known as a Slocum glider, that is carrying an ocean acidity sensor. This is the first time that oceanographers have married the two technologies—glider and pH sensor—to get a big-picture view of changes underway in the commercially important fishing grounds of the Northeastern United States.

Read the full story at National Geographic

Ocean Acidification Could be a Net Positive for Some Fish

March 30, 2018 — One of the consequences of pumping more and more carbon dioxide into the atmosphere is the changing chemistry of the world’s oceans. Until now, the ocean has acted as a big sponge, soaking up about one-third of the CO2 released by human activities.

But now, scientists are watching a vast experiment unfold. All that carbon dioxide is triggering chemical reactions that is turning the oceans more acidic, which in turn is making life tough for lots of marine organisms. Oysters and other shellfish have been hit by die-offs in the Pacific Northwest and Gulf of Maine, while tropical reefs are dissolving faster than they can rebuild, according to a recent study in the journal Science.

Some researchers are seriously considering geoengineering to reverse the slow acidification of the ocean. Dissolving minerals like olivine or limestone into seawater would increase its alkalinity. (Remember the pH strip in your 10 gallon fish tank? Blue=alkaline, red=acidic.) Not only would that make it easier on marine life, but it would also allow the ocean-sponge to soak up more carbon dioxide from the atmosphere. Two British scientists proposed this idea last year in a paper in the journal Reviews of Geophysics, predicting that with a bit more research (and money) it may be possible to capture hundreds of billions to trillions of tons of carbon without messing up the marine ecosystem.

But this kind of massive planetary experiment needs lots of small-scale work in the laboratory before it’s ready. So in the meantime, marine scientists are trying to find which species will come out on top in a more acidic ocean.

In Sweden, a group of researchers tested survival in an artificially acidic ocean. In a fjord, they built an enclosed, floating test tube they called a “mesocosm” and filled it with phytotoplankton, zooplankton, and tiny herring larvae. Then they turned up the dissolved carbon dioxide, tracking herring survival over time as the acidity increased.

A similar lab experiment with codfish, another important Northern European food fish, killed off the fish. “Our surprise is that we didn’t find that,” said Catriona Clemmesen-Bockelmen, a marine ecologist from the GEOMAR Helmoltz Center for Ocean Research in Kiel, Germany, and a co-author on the study in Nature Ecology and Evolution. “Instead, we had a higher survival rate.” The herring, it seemed, liked the extra acidity.

Read the full story at Wired