Saving Seafood

Gulf of Maine sees rising pH, defying expectations of increasing ocean acidity

July 31, 2025 — The Gulf of Maine—home to commercial fisheries for oysters, clams and mussels—has unexpectedly avoided an increase in seawater acidity, helping to preserve the health of its fisheries.

“Contrary to expectation,” a team of scientists wrote in a paper published in the journal Scientific Reports, we … find that pH has increased (+ 0.2 pH units) over the past 40 years, despite concurrent rising atmospheric CO2.” (Determining the decades-long trend required measurements of boron isotopes within annual skeletal bands built by crustose coralline algae. More about that later.)

The Gulf’s acidity levels are unexpected because atmospheric levels of  continue to climb. And because carbon dioxide is absorbed faster and easier into , the frigid waters of the Gulf would be expected to take in more carbon. More carbon in water generally lowers pH and increases acidity.

“One goes down and the other goes up,” said Alan Wanamaker, an Iowa State University professor of earth, atmosphere, and climate and a paper co-author. “That’s what we’ve seen in the .”

Read the full article at PHYS.org

Plenty of Space to Flex on Mussel Beach

February 10, 2025 — The presence of freshwater mussels is indicative of high water quality and a healthy ecosystem. Their absence tells a different story, and the latter is the more-familiar tale in southern New England. Their populations in this three-state region have been degraded by a long history of damming and pollution.

University of Rhode Island research associate Elizabeth Herron noted these overlooked creatures are a critical part of the region’s aquatic systems.

“They help reduce nutrients and algae by filtering out things. They can reduce things like bacteria, so they’re important,” said the program coordinator for URI Watershed Watch. “They’re an important food source. I have a dock on a pond, and I can tell you every spring, when we put the dock back out, there’s a giant pile of empty, freshwater mussel clams that the muskrats feasted on over the winter.”

These bivalves are sometimes called “livers of the river,” because they filter particles such as algae, E.coli, and fungi out of the water. They also provide habitat for other invertebrates and fish, and they deposit nutrients into the benthic layer for other creatures to eat.

Read the full article at ecoRI

Biopsy techniques used in human cancer research showing promise in mussel testing

September 3, 2024 — Canadian researchers applying oncology techniques to the study of mussel species have claimed their research provides a way for scientists to comprehensively test for marine pathogens in the bivalves that’s simpler, cheaper, and faster than current alternatives.

“Our approach has the potential to detect all the viruses, all the bacteria, all the pathogens,” Professor Yves St-Pierre of Canada’s Institut national de la recherche scientifique in Quebec City, Montreal, told SeafoodSource. “It’s a more integrated approach that allows us to get so much more information than what [we] can get right now.”

Read the full article at SeafoodSource

Mussel shells are changing as the ocean warms, study finds

May 3, 2024 — In Massachusetts, common blue mussels may not have the star power of Wellfleet oysters or the charisma of quahogs. But like all shellfish they play an important role in marine ecosystems. Mussels are filter feeders that clean water as they eat; and they clump into reefs that create habitat for other critters and buffer coasts from storms.

But mussels are threatened by the warming waters and ocean acidification arriving with climate change. New research shows that mussels from several East Coast locations, though not yet Massachusetts, have shells speckled with tiny holes — far more than the mussels of yesteryear.

This increased porosity is not enough to weaken the shells, yet, “but if we continue down this route, they might get there,” said study author Leanne Melbourne, a postdoctoral researcher at the American Museum of Natural History, who used historic mussel shells from museum’s collections for the study.

Melbourne, who studies the impact of climate change on marine organisms, said that ocean warming is the “most likely driver” of the increased porosity.

Read the full story at WBUR

 

Innovative Fish Farms Aim to Feed the Planet, Save Jobs and Clean Up an Industry’s Dirty Reputation

April 20, 2022 — Carter Newell owns and operates one of the most productive mussel farms in the state of Maine. One frigid spring morning I joined him and his two-person crew on a short boat ride to the barge he calls Mumbles, a 60-by-24-foot vessel anchored that day in a quiet cove in the brackish Damariscotta River. Named for the Welsh seaside town where Newell once did research, Mumbles was tethered to a steel-framed raft hung with hundreds of 45-foot ropes, each thick with thousands of mussels in various stages of development.

I shivered in the piercing wind as a crew member stepped from Mumbles onto the shifting raft to identify mussel ropes ready for harvest. Newell remained on the barge to helm a 16-foot crane that hauled up the designated ropes, each heavy with a Christmas tree–shaped aggregation of roughly 3,000 mussels. An outsized brush then swept the bivalves off the ropes and into an enormous stainless steel bucket. Another machine funneled them into a heavy polyethylene bag the size of a baby elephant, from which they were poured onto a conveyor-belt apparatus to be scrubbed, sorted and bagged. Newell designed this ungainly Willy Wonka–esque apparatus over decades in a costly process of trial and error that faced—and ultimately overcame—several challenges, including protecting the mussels from turbulent seas and voracious eider ducks.

Read the full story at Scientific American

 

Mollusks in Oregon coast watersheds contain forestry pesticides, study says

May 11, 2021 — Oysters, estuarine clams and freshwater mussels in watersheds along the Oregon coast contain pesticides used in managing forests, according to a study funded by Oregon Sea Grant.

Researchers from Portland State University found pesticides in 38 percent of the tissue samples. Indaziflam, an herbicide currently used in Oregon forestry, was found in about 7 percent of the samples. Contaminants also included pesticides used in orchards, Christmas tree farms and homes, as well as banned pesticides, including DDT byproducts.

The study, published in the journal Toxics, may help guide forest management practices to reduce the amounts of forestry chemicals entering aquatic ecosystems.

The study was led by Kaegan Scully-Engelmeyer, a doctoral student in the earth, environment and society program at PSU, and PSU marine ecologist Elise Granek.

They collected tissue samples from freshwater western pearlshell mussels — softshell clams typically found in the upper area of estuaries — and Pacific oysters. They collected them from watersheds along the Oregon coast in 2017 and 2018. These organisms are good indicators of environmental contamination because they are sedentary filter feeders.

Read the full story at the Newport News Times

MASSACHUSETTS: Chatham, feds reach truce on disputed fishing rights

March 10, 2021 — With the keystroke of an electronic signature, the Select Board signaled an end Monday night to seven years of bitter wrangling with the U.S. Fish and Wildlife Service over control of fisheries in the waters off Monomoy National Wildlife Refuge.

The board signed a memorandum of understanding that codified the relationship that exists now between the town and the federal agency in which Chatham continues to manage fisheries for clams, oysters and scallops in the disputed area — and the two parties agree to work together on future changes as new fisheries or fishing technologies emerge.

“This memorandum of understanding creates a process to ensure the sustainable management of fishery resources that have been so important to our town and ensures our town will continue to manage these fisheries consistent with past practices,” board Chair Shareen Davis said. The agreement does continue a ban on harvesting mussels, which are eaten by migrating waterfowl.

Read the full story at the Cape Cod Times

MASSACHUSETTS: Panel: Ocean acidification threatens lucrative shellfish sector

February 10, 2021 — As a result of climate change and direct human factors, the waters of the Atlantic Ocean off Massachusetts are becoming more acidic, making them a less friendly habitat for the shellfish that drive a key industry here.

With no action, many of the scallops, clams, mollusks and lobsters at the bottom of the ocean in the Gulf of Maine will begin to dissolve by 2060 and new ones will struggle to form, imperiling an industry that supports thousands of people in the Bay State, a special commission said in a report Tuesday.

The Special Legislative Commission on Ocean Acidification recommended that Massachusetts establish a broad ocean acidification monitoring system and funnel more money into existing programs that address some of the things that are making the ocean more acidic, like residential and agricultural runoff, septic discharges and the deterioration of natural wetlands.

“Ocean acidification poses a serious threat to the Massachusetts state economy, and a potentially existential threat to coastal economies that rely heavily on shellfishing,” the commission wrote in the conclusions of its report. “Massachusetts should act to combat ocean acidification now, rather than later. Ocean acidification is expected to worsen significantly before the end of the century. Actions taken now will ultimately be more cost-effective and valuable than actions taken when significant damage has already occurred.”

Global carbon dioxide emissions absorbed by the ocean and nutrient pollution of waterways drive the pH level of areas of the ocean down, making the waters more acidic and limiting certain ions that help clams, oysters, scallops, mussels and lobsters form their protective shells.

Read the full story at WHDH

UK shellfish sector hit with EU ban

February 5, 2021 — The European Union has put a stop to the import of live bivalve mollusks from the United Kingdom that are not ready for human consumption, plunging the country’s shellfish sector into further uncertainty.

The measure follows on the heels of the challenges caused by new post-Brexit border rules. Historically, U.K. shellfish producers have exported millions of pounds of mussels, scallops, oysters, and other products into E.U. member-states. However, as the U.K. is now a separate country and subject to strict hygiene rules, it is no longer allowed to transport these animals to the E.U. unless they have already been treated in purification plants.

Read the full story at Seafood Source

Northeast Offshore Mussel Farming Would Contribute to American Seafood Competitiveness

July 31, 2020 — The following was released by NOAA Fisheries:

The first environmental suitability study for blue mussel culture in federal waters off New England’s shore was conducted by scientists from the Northeast Fisheries Science Center’s Milford Laboratory. The study revealed great potential for farming. The scientific team has continued this work, furthering the case for offshore mussel farms in a recent perspectives column in Fisheries Magazine. They have also published findings in Ocean & Coastal Management, examining the risks harmful algal blooms pose to offshore aquaculture.

The Case for Mussels

Milford’s Darien Mizuta and Gary Wikfors suggest that a New England offshore mussel farming industry would be environmentally sustainable and beneficial for food security and the economy. The United States is the world’s top importer of seafood, despite having the second largest Exclusive Economic Zone. In May, the president of the United States signed an executive order promoting American seafood competitiveness and economic growth. The order calls for increasing domestic seafood production, including making aquaculture permitting more efficient and predictable and bolstering aquaculture research.

Mussels are the top imported bivalve shellfish in the United States, currently contributing more than $102 million to the $14 billion U.S. seafood deficit. Close to Canada’s mussel-producing Prince Edward Island, New England is the import epicenter for mussel products, including fresh live mussels, frozen mussels, and prepared mussel dinners.

With advances in mussel farming in the 1990s, the United States began importing more mussels, mostly from Canada. “The success of Prince Edward Island mussel farming has created a new market for mussels in the northeast United States that is growing beyond the production capacity of PEI,” explains Wikfors, who is also the director of the Milford Laboratory, where Darien Mizuta was a postdoctoral researcher.

Read the full release here