Saving Seafood

New Study Finds Ways to Potentially Reduce Uncertainty in Shellfish Assessments

December 4, 2020 — The following was released by the Science Center for Marine Fisheries:

Researchers working to determine the abundance of shellfish, including surfclams and ocean quahogs, have faced limits in getting a precise count due to the uncertainty inherent in stock assessment surveys. A new study, by Leanne Poussard, Dr. Eric Powell, and Dr. Daniel Hennen and published this month in Fisheries Research, examines one of these sources of uncertainty.

Uncertainty is a major factor affecting all stock assessments, which rely on estimating the size of an entire population based on the data provided by a small sample. Identifying these sources of uncertainty is key to producing precise estimates. In the case of surfclams and other shellfish species, a main driver of uncertainty is how efficient the dredges used during the stock surveys are in catching shellfish.

The National Marine Fisheries Service (NMFS) conducts what are known as depletion experiments to measure how efficiently a dredge harvests clams; a dredge will be run multiple times in a single area, and how quickly the catch declines with each subsequent tow will be used to estimate its efficiency. NMFS has also developed a statistical model to estimate the level of uncertainty present in these experiments.

Using this model, as well as running simulations of dredge tows, the new study finds that uncertainty in depletion experiments can be significantly reduced by taking measures such as running additional tows, and having more overlapping tows during the course of an experiment to measure gear efficiency. Having these measures in place could significantly reduce the role of survey gear as a source of uncertainty.

“By making modest changes to the way we conduct surfclam depletion experiments, we can potentially reduce uncertainty and be more confident in the ultimate results of clam stock assessments,” said Leanne Poussard, the lead author of the study. “This study provides clear guidance on the best ways to conduct future shellfish depletion experiments.”

“As a participant in NMFS surfclam and ocean quahog stock assessments over the past 30 years, I can attest that uncertainty regarding dredge efficiency has been a continuing source of scientific caution in projecting stock biomass, and appropriate levels of commercial harvest,” said Tom Alspach, of Sea Watch International. “This new work should significantly ameliorate that uncertainty, allowing fishery managers to appraise stock sustainability with more confidence, leading in turn to stability in annual quotas for the direct benefit of the harvesting sector. This is why the surfclam/ocean quahog industry has enthusiastically provided financial support for the research initiatives of SCEMFIS.”

The study is the latest to be funded by the Science Center for Marine Fisheries (SCEMFIS), and is part of the Center’s work of improving shellfish science and management. SCEMFIS is part of the National Science Foundation’s Industry-University Cooperative Research Center program. Working together with its partners in the fishing industry, SCEMFIS identifies the most pressing needs in finfish and shellfish science. In the last year, SCEMFIS funded over $191,000 in scientific research.

MASSACHUSETTS: Shortage Of Oysters And Quahogs Expected In The Next Few Years

October 16, 2020 — The number of quahogs and oysters in Falmouth waters will drop precipitously in upcoming years as a result of the pandemic and a lack of manpower needed to manage the shellfish.

The normal 2020 shellfish growing efforts by the Falmouth Marine and Environmental Services department was canceled as the town took social distancing precautions. R. Charles Martinsen III, deputy director of Falmouth’s MES department, estimates there will be a loss of 750,000 to 1 million oysters and a couple million fewer quahogs in years to come.

“We will start to see the loss on recreational oysters in the fall of 2021,” Mr. Martinsen said, based on the animals’ growth cycle. Future recreational oyster propagation will continue as planned in the 2021 growing year.

“Quahogs take an extra year to grow, so that loss is expected for 2022 in both the commercial and recreational shellfishing area. The harvestable oysters were grown last year, and harvestable quahogs were propagated two to three years ago,” he said.

The legal minimum size for oysters is 3 inches in length. The legal minimum harvest size for quahogs is a 1-inch thickness at the hinge.

Read the full story at The Falmouth Enterprise

NOAA: Lobsters will look for cooler water

July 24, 2020 — Cape Cod is known for its lobsters as much as for its oysters and quahogs. But it’s getting too warm in these waters for the tasty crustacean.

Researchers have projected significant changes in the habitat of commercially important American lobster and sea scallops on the Northeast U.S. continental shelf. They used a suite of models to estimate how species will react as waters warm, and it suggests that American lobster will move further offshore and sea scallops will shift to the north in the coming decades, a recent statement from NOAA Fisheries warned.

Findings from the study were published recently in Diversity and Distributions. They pose fishery management challenges as the changes can move stocks into and out of fixed management areas. Habitats within current management areas will also experience changes — some will show species increases, others decreases, and still others no change.

“Changes in stock distribution affect where fish and shellfish can be caught and who has access to them over time,” said Vincent Saba, a fishery biologist in the Ecosystems Dynamics and Assessment Branch at the Northeast Fisheries Science Center and a co-author of the study.

Read the full story at Wicked Local

MAINE: New England fish forum kicks off with shellfish day

February 28, 2019 — New England’s largest fishing industry trade show is getting started with a focus on the region’s shellfish business.

Thursday is the first day of the 2019 Maine Fishermen’s Forum. The event runs through Saturday. Organizers say Thursday is the event’s “Shellfish Focus Day.”

The day will include seminars about outreach and education in the shellfish industry, as well as about shellfish science and management of shellfish species. The shellfish business is a major piece of the fishing industry in New England, where fishermen harvest scallops, softshell clams, quahogs are other valuable species from the Atlantic Ocean and coastal areas.

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

Key US Shellfish Quotas Will Remain the Same Next Year

November 8, 2018 — A couple of the most significant fisheries for shellfish on the East Coast will have the same catch quotas next year.

Fishermen harvest surf clams and ocean quahogs from the Atlantic Ocean every year for use in chowders, fried clam dinners and other popular seafood dishes. The National Oceanic and Atmospheric Administration says the quota for the two species will be unchanged in the new fishing year that begins on Jan. 1.

The quota will be 5.33 million bushels for ocean quahogs and 3.4 million bushels for surf clams. The quota for Maine ocean quahogs will be limited to 100,000 Maine bushels, which is also the same as the current year.

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

Researchers identify causes of decline in shellfish harvests

November 5, 2018 — NOAA researchers studying the 85 percent decline between 1980 and 2010 of the four most commercially-important bivalve mollusks — eastern oysters, northern quahogs, softshell clams, and northern bay scallops — have identified the causes.

Along with the sharp decline in commercially important bivalves, there has been a corresponding decline in the numbers of fishermen (89 percent) who harvested the bivalves, said researchers with NOAA’s National Marine Fisheries Service.

The bivalve declines are in contrast to the previous three decades (1950–80) when the combined landings of the same bivalves were much higher and the trend in each of their annual landings was nearly level, decade by decade.

The only exceptions to the declines were seen in the harvest of northern quahogs in Connecticut and American lobsters in Maine. However, the numbers of American lobster landings have fallen precipitously – as much as 98 percent – from southern Massachusetts to New Jersey.

The researchers also found during the course of the study that a number of groups of marine and land animals have also experienced large shifts in abundance since the early 1980’s.

Read the full story at Digital Journal

Residents alarmed by proposed expansion of Maine shellfish farm

September 17, 2018 — ELIOT, Maine — Frustrated residents from the Eliot and Kittery sides of Spinney Creek appeared before the Select Board Thursday night, seeking recourse about their concerns of the proposed expansion of Spinney Creek Shellfish.

Spinney Creek Shellfish, at 27 Howell Drive in Eliot, is applying to the Maine Department of Marine Resources to obtain a three-year aquaculture lease on 3.67 acres of Spinney Creek, a salt pond between Eliot and Kittery off the Piscataqua River. The new lease is for raising oysters and littleneck clams (quahogs) in suspended cages.

The residents have discovered Eliot and Kittery’s boards have no control over aquaculture in the pond.

Roberta Place of Spring Lane on Spinney Creek said residents of 50 households bordering the creek are concerned about the creek’s health.

“I have lived there a long time. I used to swim there with a wet suit. Now the temperature in the creek is 74 degrees,” she said.

She said she thought oysters are supposed to clean water, but added that the eelgrass in front of house has disappeared.

Read the full story at the Bangor Daily News

 

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

RHODE ISLAND: Fisheries Face Climate Peril, Aging Fleet

November 23, 2016 — As the guest speaker at Seamen’s Church Institute’s annual meeting on Monday, Nov. 14, Newport’s David Spencer, a lobsterman and president of the Commercial Fisheries Research Foundation, reviewed the state of the commercial fishing industry in Rhode Island.

Spencer has run his 85-foot lobster boat Nathaniel Lee out of Newport’s State Pier since 1973, and graciously supplies free lobsters for Seamen’s annual Rock the Docks fundraiser.

“Back then, this was a vibrant fishing port, from south to north. It had many boats that docked here,” he said. “It was a good place to fish out of.”

Spencer said that all three Newport fish houses at that time had traps off Ocean Drive, near mooring docks that would be “awash in fish” with an almost daily, intricate choreography of dockworkers sorting and loading them all into trucks. “It was something to behold,” he recalled.

According to Spencer, present-day fleets gather quahogs, lobster, crabs, conch and a little known kind of shrimp in these waters. “It’s been a good opportunity for fishermen with smaller 20-foot boats,” with trawlers catching squid, butterfish, flounder, herring, black sea bass, and more. Improved netting allows turtles, cod, and other illegal species to escape.

Working “out front” in Rhode Island Sound waters and beyond, the lobster and crab fishery becomes one, “with an explosion of Jonah crabs, which has been a godsend for much of the fleet,” said Spencer. “There is a tremendous demand for these crabs,” which augment a depleted annual lobster catch.

Read the full story at Newport This Week