Saving Seafood

Ocean acidification causing coral ‘osteoporosis’ on iconic reefs

August 28, 2020 — In a paper published Aug. 27, 2020, in the journal Geophysical Research Letters, researchers show a significant reduction in the density of coral skeleton along much of the Great Barrier Reef — the world’s largest coral reef system — and also on two reefs in the South China Sea, which they attribute largely to the increasing acidity of the waters surrounding these reefs since 1950.

“This is the first unambiguous detection and attribution of ocean acidification’s impact on coral growth,” says lead author and WHOI scientist Weifu Guo. “Our study presents strong evidence that 20th century ocean acidification, exacerbated by reef biogeochemical processes, had measurable effects on the growth of a keystone reef-building coral species across the Great Barrier Reef and in the South China Sea. These effects will likely accelerate as ocean acidification progresses over the next several decades.”

Roughly a third of global carbon dioxide emissions are absorbed by the ocean, causing an average 0.1 unit decline in seawater pH since the pre-industrial era. This phenomenon, known as ocean acidification, has led to a 20 percent decrease in the concentration of carbonate ions in seawater. Animals that rely on calcium carbonate to create their skeletons, such as corals, are at risk as ocean pH continues to decline. Ocean acidification targets the density of the skeleton, silently whittling away at the coral’s strength, much like osteoporosis weakens bones in humans.

“The corals aren’t able to tell us what they’re feeling, but we can see it in their skeletons,” said Anne Cohen, a WHOI scientist and co-author of the study. “The problem is that corals really need the strength they get from their density, because that’s what keeps reefs from breaking apart. The compounding effects of temperature, local stressors, and now ocean acidification will be devastating for many reefs.”

Read the full story at Science Daily

The Last Lobster Supper?

August 17, 2020 — Mark Ring has been fishing the Stanley Thomas for nearly 30 years. With its red hull, the sturdy boat is the watercraft incarnation of Ring himself—a burly guy with permanently ruddy cheeks just above the hairline of his Vandyke beard. It is his second boat. It is also his last. Ring started lobstering when he was a teenager. Back then, he recalls, he didn’t have to go far from shore to set his traps. He’d head out and, barring thick morning fog, he could see the coastline and hundreds of lobster buoys bobbing in the waters before him. “You could drop your cages and hear them hit the bottom,” Ring says in a steep North Shore accent, leaning against the Stanley Thomas’s worn center console while remembering the old days. He’d haul his yellow traps up from the sea floor, the ropes slimy with algae, the cages bursting with lobsters aggressively clawing to get out. After a typical nine-hour day, Ring would return to the marina, hoist his traps onto the wet deck, and offload 2,000 lobsters.

That’s all changed now. The days are longer and the haul is harder won. When Ring motors out predawn from the backshore Gloucester marina where he’s docked the Stanley Thomas for years, he must power out farther to deeper, colder water. “The lobsters are just not settling in 6 feet of water like they did 15 years ago,” he says. “They want to find the optimum temperature. And that temperature is at 20 feet.” When Ring heads back in at the end of a long day, the lobsters in his traps have far too much legroom. He is netting less than half of what he used to.

In the face of climate change, throughout New England, the American lobster is vanishing, and the lobsters that remain are quickly heading farther out to sea in search of colder waters. Rising pH levels in the waters closer to shore have also contributed to weaker shells, which reduce the chances the lobsters will make it to market alive. More often than not, lobstermen are tossing this weak-shelled catch back into the ocean. Such factors help explain why lobstermen across New England are seeing the weight of their landings continue to dip; last year, Maine’s landings dropped by 21 million pounds, to about 100 million, the lowest in more than a decade.

That’s a steep decline, but it’s nothing compared to what will become of the industry if the self-coronated “Prince of Whales,” New Hampshire’s Richard “Max” Strahan, has his way. He has all but made it his mission to end lobster fishing in order to save the endangered North Atlantic right whale—and, as a result, the future of the beloved lobster roll as we know it is looking pretty bleak. His adversaries have a different nickname for him: Mad Max.

A career endangered-species activist, Strahan sports an overgrown mustache, a floppy fisherman’s hat, and a smug grin. He’s filed more lawsuits than he can practically count on behalf of the right whale, and never eats seafood. “I’ve ruined more than a few clambakes,” he says. “Just try to put a lobster in a pot in front of me!” He has been arrested multiple times, and his frequent outbursts have earned him a police escort at most meetings of the National Oceanic and Atmospheric Administration Fisheries, where he shows up to advocate for whales and also trade insults with lobstermen. For very good reasons, his only listed contact is a post office box.

Read the full story at Boston Magazine

New research plan sets the course for NOAA’s ocean acidification science

July 30, 2020 — The following was released by NOAA:

Today, NOAA unveiled its new 10-year research roadmap to help the nation’s scientists, resource managers, and coastal communities address acidification of the open ocean, coasts, and Great Lakes.

“Ocean acidification puts the United States’ $1 billion shellfish industry and hundreds of thousands of jobs at risk,” said Kenric Osgood, Ph.D., chief of the Marine Ecosystems Division, Office of Science and Technology at NOAA Fisheries Service. “Understanding how ocean acidification will affect marine life and the jobs and communities that depend on it is critical to a healthy ocean and blue economy.”

The research plan sets out three major objectives for ocean, coastal, and Great Lakes acidification research, and includes regional chapters for coastal zones around the U.S., Great Lakes, territories – including Puerto Rico and American Samoa – and deep ocean regions. The three national research objectives are:

1) Expand and advance observing systems and technologies to improve the understanding of and ability to predict acidification trends and processes;

2) Understand the ways acidification is impacting ecologically and economically important species and the ecosystems they live in, and improve our ability to predict how these ecosystems and species may respond to acidification and other stressors; and

3) Identify and engage stakeholders and partners, assess needs, and generate products and tools that support management decisions, adaptation, and resilience to acidification.

Read the full release here

Ocean Acidification Threatens Bivalve Industry

July 9, 2020 — Worldwide, ocean levels are rising at an accelerated pace. Cape May County is feeling the effects of exacerbated weather events, as a result.

Yet, there is another drastic change affecting the oceans – a decrease in the water’s pH levels. This is a change that industry leaders and scientists fear will drastically affect the county, namely its bivalve (aquatic invertebrates with a hinged shell) industry that is, as marine and coastal sustainability expert Dr. Daphne Munroe said, “At the heart of the economy in this region.”

As carbon is released into the atmosphere, it was once speculated that the ocean’s tendency to absorb emissions would be a net positive, as it spared the Earth’s atmosphere from the worst of the emissions. Dr. Feely, senior scientist at National Oceanic and Atmospheric Administration (NOAA), said, “[It’s] a huge service the oceans are doing that significantly reduces global temperature.”

However, scientists are coming to realize that the ocean’s absorption of carbon emissions comes at a great cost, and that the long-term effects of an ocean that has absorbed great amounts of carbon emissions mean that ecosystems will ultimately suffer.

Read the full story at the Cape May County Herald

Maine to collect ocean acidification data with new sensors

May 26, 2020 — Maine marine officials said three new sensors installed in a coastal community will help scientists get a better understanding of ocean acidifcation.

The growing acid levels in the ocean are a hazard for some kinds of sea life, including some of those sought by Maine fishermen. Scientists have linked acidification to factors that also drive climate change.

The Maine Department of Marine Resources said it has installed the three sensors in Boothbay Harbor. The department said the sensors will help researchers get a better understanding of how ocean acidification and dissolved oxygen levels can change the health of the state’s marine life and ecosystems.

Read the full story at the Associated Press

West Coast fishing communities’ vulnerability to climate change assessed in new study

April 17, 2020 — Climate change is warping the West Coast marine ecosystem. Warm waters are driving species north. Acidification and deoxygenation are threatening coastal species.

Fishermen are intimately familiar with these impacts. When the marine heat wave of 2014 and 2015 – dubbed “the Blob” – raised water temperatures for months on end, fishermen saw landing revenues of salmon and hake drop. That heat wave foreshadowed the increased and more severe heat waves that are likely to come.

Read the full story at Seafood Source

Can kelp help protect shellfish from ocean acidification?

February 27, 2020 — Marine scientist Susie Arnold of the Island Institute will discuss research about kelp farming and ocean acidification Monday, March 9 at 5 p.m. at the MDI Biological Laboratory, as part of the laboratory’s Science Café series.

Maine’s scenic coastlines and long-established fisheries contribute to the state’s economy, making Maine vulnerable to the effects of ocean acidification from both an environmental and socio-economic perspective.

To address this vulnerability, Maine was the first East Coast state to convene a legislatively established commission, tasked with understanding increased ocean acidification and the potential impacts on commercially important species.

Arnold has been part of a joint research effort, undertaken by Island Institute, Bigelow Laboratory for Ocean Sciences and aquaculture industry collaborators, to better understand the role of growing and harvesting macroalgae in capturing carbon, and to determine potential benefits of co-cultivating kelp or other macrophytes alongside farmed shellfish.

Read the full story at the Mount Desert Islander

Climate Change Doesn’t Have To Be Dire For Seafood, Researchers Say

January 29, 2020 — The increasingly worrisome impacts of climate change may not mean the end of seafood on our plates, a new study suggests. In a new paper entitled The Future Of Food From The Sea, researchers found that the ocean could supply over six times the amount of food that it does today—that’s 364 metric tons of protein—but only if we change the way we govern, manage and consume the world’s fish supply. To put it bluntly—if a little too simply—if you’re ready to eat less wild Atlantic salmon and more sustainably farmed seaweed and mussels, keep on reading.

“We’re all used to headlines in the newspaper about the demise of the oceans,” lamented Christopher Costello, PhD, an economist and one of the lead authors of the study who presented the findings on January 16 at the Washington, D.C. offices of the World Resources Institute. “It’s easy to come away from those headlines, many of which I think are quite accurate, thinking a sustainable future ocean will provide less food,” he added. But this shrinking ocean-based food supply isn’t a given, urged Costello. Just the opposite could be true, in fact.

“Food from the sea is uniquely poised to contribute to food security,” Costello explained, because it has a low carbon footprint, is highly nutritious and is far more environmentally efficient to produce as compared to other animal proteins.

Read the full story at Forbes

The Pacific Ocean is so acidic that it’s dissolving Dungeness crabs’ shells

January 28, 2020 — The Pacific Ocean is becoming more acidic, and the cash-crabs that live in its coastal waters are some of its first inhabitants to feel its effects.

The Dungeness crab is vital to commercial fisheries in the Pacific Northwest, but lower pH levels in its habitat are dissolving parts of its shell and damaging its sensory organs, a new study found.

Their injuries could impact coastal economies and forebode the obstacles in a changing sea. And while the results aren’t unexpected, the study’s authors said the damage to the crabs is premature: The acidity wasn’t predicted to damage the crabs this quickly.

“If the crabs are affected already, we really need to make sure we pay much more attention to various components of the food chain before it is too late,” said study lead author Nina Bednarsek, a senior scientist with the Southern California Coastal Water Research Project.

The findings were published this month in the journal Science of the Total Environment and funded by the National Oceanic and Atmospheric Administration (NOAA). The agency studies ocean acidification and how changing pH levels are impacting coasts.

Read the full story at CNN

Crab larvae off Oregon and Washington suffering shell damage from ocean acidification, new research shows

January 27, 2020 — Ocean acidification is damaging the shells of young Dungeness crab in the Northwest, an impact that scientists did not expect until much later this century, according to new research.

A study released this week in the journal Science of the Total Environment is based on a 2016 survey of Oregon, Washington and British Columbia coastal waters that examined larval Dungeness. The findings add to the concerns about the future of the Dungeness as atmospheric carbon dioxide — on the rise due to fossil-fuel combustion — is absorbed by the Pacific Ocean and increases acidification.

“If the crabs are affected already, we really need to make sure we start to pay attention to various components of the food chain before it is too late,” said Nina Bednarsek, the lead author among 13 contributing scientists. The study was funded by the National Oceanic and Atmospheric Association (NOAA).

Read the full story at The Seattle Times