Saving Seafood

Changes in Gulf of Maine may endanger lucrative fish stocks, experts say

July 8 2022 — Scientists have known the Gulf of Maine is warming rapidly, but new research suggests it’s also getting saltier, more acidic and increasingly stratified — raising concerns for its fish stocks.

The dramatic shifts in the gulf’s biochemistry are raising questions about the future of a region that has historically produced some of the world’s richest fish stocks — from cod to lobsters — and has built billion-dollar industries around them.

“We found that primary productivity, the rate at which the phytoplankton is fixing carbon in the ocean, has dropped to about a third of what it was in the early 2000s,” Barney Balch, a biological oceanographer and senior researcher at the Bigelow Laboratory for Ocean Sciences, told UPI. “That really raised alarm bells with us.”

According to Balch, decreases in primary productivity — the carbon fixing — may affect life in the gulf from phytoplankton all the way up the food chain, including fish that humans eat.

For more than 20 years, Balch and his research partners have been helping NASA calibrate and validate ocean surface temperature data collected by the agency’s polar-orbit satellites.

Many researchers have pointed to the Gulf of Maine as one of the world’s most rapidly warming bodies of water, but Balch’s paper, published this month in the Journal of Geophysical Research: Biogeosciences, is one of first to showcase the full scope of the gulf’s regime change.

While it’s not yet clear how these changes will impact the region’s ecosystems, data collected by Balch’s team suggest the base of the marine food web in the gulf is in the midst of a transformation.

Over the last 30 years, warming has mostly proven a boon to lobsters in the Gulf of Maine, especially in places, like the Penobscot Bay and the Bay of Fundy, that were historically on the chillier side of a lobster’s comfort zone.

And though Balch isn’t privy to the data being collected by Wahle and his research partners, he says it’s not a stretch to hypothesize that declines in diatoms, a primary source of nutrients for copepods, are likely to have ripple effects up the food chain — ripple effects that will ultimately impact the lobsters and some number of other fisheries.

Read the full story at UPI

Offshore wind farms could reduce Atlantic City’s surfclam fishery revenue up to 25%, Rutgers study suggests

July 1, 2022 — New research from Rutgers University shows Mid-Atlantic surfclam fisheries could see revenue losses from planned offshore wind farms, at least in the short- to medium-term after the development takes place.

The data is sure to fuel opposition from the fishing industry to the Biden administration’s rapid offshore wind development along the New York, New Jersey, and Delaware coasts. President Joe Biden has a goal of generating 30 gigawatts of wind energy by 2030 as part of his effort to tackle climate change.

Clammers and scallop fishermen fear a shrinking patch of fishable ocean will lead to the collapse of the industry.

Surfclam harvests stretching from Maine to Virginia generate about $30 million in annual revenue. The Rutgers study, “The Atlantic Surfclam Fishery and Offshore Wind Energy Development,” published in the ICES Journal of Marine Science, used a newly-developed model to determine average revenue reductions between 3 and 15% overall.

Read the full story at WHYY

University of Idaho study shows climate change is shrinking natural habitat for salmon

June 29, 2022 — A new study from the University of Idaho finds climate change is shrinking the natural habitat for salmon. The university’s study, published by the American Geophysical Union journal Geophysical Research Letters, confirmed that lower water volumes and warm temperatures are dramatically shrinking spawning beds and nurseries for the fish. 

U of I Eco hydraulics Professor Daniele Tonina and her colleagues examined Bear Valley Creek which is known for its population of Chinook salmon. According to a university press release, the stream’s wide valley, meandering main river and cozy side-streams made the site “representative of ideal salmon habitats in the Pacific Northwest.” 

The team mapped the river’s channels and floodplain, and used 60 years of historical stream-flow data, from 1957 to 2016, to calculate trends in the flow. The team then used the data to predict estimated changes to salmon habitat up to the year 2090.  

The study period illustrated that the stream flow volume dropped by 19%, and slowed by 17%. That means less overall area suitable for salmon nests and a loss of off-channel havens as side-streams get cut off from the main channel. The salmon lost 23% of their spawning habitat as well. 

Read the full story at KXLY

Offshore wind industry boosted as New England governors team up with Biden

June 23, 2022 — The White House is launching a formal partnership with 11 East Coast governors to boost the growing offshore wind industry, a key element of President Joe Biden’s plan for climate change.

At a White House meeting on Thursday, Biden administration officials will meet with governors and labor leaders to announce commitments to expand important parts of the offshore industry, including manufacturing facilities, ports and workforce training and development.

The partnership comprises governors of both parties from Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania and Rhode Island.

In working with states and the private sector, the White House said it will “provide Americans with cleaner and cheaper energy, create good-paying jobs and invest billions in new American energy supply chains,” including construction of wind turbines, shipbuilding and servicing.

Read the full story at The Boston Globe

Don’t endanger aquatic ecosystems in the name of solving climate change

June 20, 2022 — In New England, too, we are being told that jeopardizing fishery-supporting ecosystems is the price we must pay to solve climate change. Here, the argument is coming from offshore wind proponents, who are working hand-in-glove with the Biden administration to set a course to install 30 gigawatts of offshore wind capacity by 2030 — from a baseline of almost zero in just eight years — and 110 gigawatts by 2050, with most of the initial development taking place off New England and the mid-Atlantic and limited environmental review taking place prior to the issuance of leases.

What would this scale of development look like? With today’s technology, 110 gigawatts would be almost 8,500 turbines — 137 times the size of the Vineyard Wind facility planned for south of Cape Cod. It would mean near-continuous construction on the continental shelf for three decades. While no one knows what the ecological impacts of such construction might be (and that’s precisely our point), evidence suggests they may include alterations of the acoustic and sensory environment, electromagnetic fields, and current and wind patterns, affecting a variety of species whose survival depends on these aspects of the underwater world.

Offshore wind off New England and mining in the Bristol Bay watershed are linked by more than just spurious ultimatums invoking climate catastrophe as the inevitable consequence of keeping these wild places wild. It also happens that offshore wind, which requires hundreds of miles of electrical cables measuring up to 11 inches in diameter, is the most copper-intensive of all renewable energy technologies. Every mile of cable laid across the ocean floor will spur greater pressure to mine copper in precious, irreplaceable places like Bristol Bay.

Read the full op-ed at The Boston Globe

Scientists point to climate change as likely cause for Alaska snow crab decline

June 17, 2022 — Even as scientists are still trying to figure out why the Bering Sea snow crab stock crashed in 2021, federal managers are working on a plan to help rebuild it.

The North Pacific Fishery Management Council last week voted to accept alternatives for analysis on its snow crab rebuilding plan — a middle step before implementing an actual plan that will change fishing regulations or openings. The council is on track to approve a final plan for action in December, which would then go to the Secretary of Commerce and through the federal regulation process before becoming official.

Data from last year’s survey at this point seems to confirm that there was a massive decline in the number of young snow crab in the Eastern Bering Sea — something like 99% fewer female snow crab showed up in the survey from 2021.

There’s no complete consensus about why the stock crashed in the first place. Increasingly, however, the models seem to indicate that it’s due to temperature increases linked to climate change.

Read the full story at the Anchorage Daily News

Right whales stay in Cape Cod Bay longer, and later

June 16, 2022 — It isn’t high gas prices that changed the travel plans of right whales.

A new study in Global Change Biology by nine authors discovered that over the last couple of decades North Atlantic right whales are most active in Cape Cod Bay 18 days later than before.

That’s a shift — with a longer stay in the month of May — that could potentially bring the whales further into conflict with the region’s annual boating  and lobster season and require an extended season of protections.

“The state has a flexible rule in place — where they can extend fishing closures and small boat speed restrictions — that now is in place up the coast to New Hampshire,” the study’s lead author, Dan Pendleton of the New England Aquarium, said. “Massachusetts Bay has seen more right whales than it used to.”

“One of the problems with migratory animals is they can get into big trouble moving into shipping lanes so if we can move and adapt the protections as (whales) adapt to climate change, that would be ideal,” Pendleton said. “So much seems out of our control but one thing we can do is push for regulations that are responsive to the needs of an endangered species.”

Beth Casoni, executive director of the Massachusetts Lobstermen’s Association, hadn’t yet seen the study, which was published June 7. Casoni said, therefore, she couldn’t comment until she has been able to read it.

Read the full story at the Cape Cod Times

Scientists see long-term hope for Maine’s lobster fishery despite warming waters

June 13, 2022 — Dire predictions about the effects of global warming on Maine’s lobster population may be exaggerated and underestimate the potential that conservation measures have to preserve the fishery into the future.

Rapid warming in the Gulf of Maine and the collapse of lobster fisheries in southern New England have fueled predictions that lobsters will likely move north out of Maine waters in the coming decades. But ongoing research at the University of Maine is revealing a more optimistic long-term view of the Maine lobster fishery.

The UMaine scientists are now projecting that temperatures in Gulf of Maine will likely remain within lobsters’ comfort zone because of the gulf’s unique oceanographic features, though changing ocean currents are harder to predict. The researchers cautioned that the dynamics of global warming are complex and make it difficult to project far into the future with certainty.

Ocean stratification – where water of different densities separates into distinct layers – is keeping the bottom temperatures colder on the Gulf of Maine’s western side, the scientists say, while strong tidal mixing in the eastern gulf and the Bay of Fundy helps moderate the water temperature there during the summer. Because Maine waters have historically been so cold, they say, even a couple of degrees of warming should keep Maine’s bottom waters below 68 degrees, the temperature at which lobsters begin to show signs of stress, according to the Atlantic States Fisheries Management Council.

Read the full story at the Portland Press Herald

New research shows climate change impacts on whale habitat use in the warming Gulf of Maine

June 10, 2022 — New research finds climate change is having an impact on how large whale species, including the critically endangered North Atlantic right whale, use habitats in the warming Gulf of Maine, showing that right whales’ use of Cape Cod Bay has shifted significantly over the last 20 years.

The study, led by the New England Aquarium and including researchers from the University of Massachusetts Amherst, the USGS Northeast Climate Adaptation Science Center, the Center for Coastal Studies, UCLA, the National Marine Fisheries Service, and the Canadian Whale Institute was published this month in the journal Global Change Biology. The authors set out to better understand the impacts of ocean climate change on phenology, or the timing of recurring biological events such as when plants flower each year. Using more than 20 years of data, the scientists measured shifts in whale habitat use in Cape Cod Bay, evaluating trends in peak use for North Atlantic right whales, humpback whales, and fin whales. The study found that peak use of Cape Cod Bay had shifted almost three weeks later for right whales and humpback whales. Changes in the timing of whale habitat use were related to when spring starts, which has been changing as a result of climate change. The study suggested that highly migratory marine mammals can and do adapt the timing of their habitat use in response to climate-driven changes in their environment, with results showing increased habitat use by right whales in Cape Cod Bay from February to May, with greatest increases in April and May.

“The time of year when we are most likely to see right and humpback whales in Cape Cod Bay has changed considerably, and right whales are using the habitat much more heavily than they did 20 years ago,” said lead author Dr. Dan Pendleton, Research Scientist in the New England Aquarium’s Anderson Cabot Center for Ocean Life.

Read the full story at ScienceDaily

NASA-funded Study: Gulf of Maine’s Phytoplankton Productivity Down 65%

June 8, 2022 — The Gulf of Maine is growing increasingly warm and salty, due to ocean currents pushing warm water into the gulf from the Northwest Atlantic, according to a new NASA-funded study. These temperature and salinity changes have led to a substantial decrease in the productivity of phytoplankton that serve as the basis of the marine food web. Specifically, phytoplankton are about 65% less productive in the Gulf of Maine than they were two decades ago, scientists at Bigelow Laboratory for Ocean Sciences in East Boothbay, Maine, report in new results published today.

The Gulf of Maine helps fuel New England’s marine ecosystems and economy. Like plants on land, phytoplankton absorb carbon dioxide from the atmosphere and use photosynthesis to grow, and then become a food source for other organisms. Disruptions to their productivity can lead to adverse effects on the region’s fisheries and the communities that depend on them.

“Phytoplankton are at the base of the marine food web on which all of life in the ocean depends, so it’s incredibly [significant] that its productivity has decreased,” says William Balch, the Bigelow Laboratory scientist who led the study. “A drop [of] 65% will undoubtedly have an effect on the carbon flowing through the marine food web, through phytoplankton-eating zooplankton and up to fish and apex predators.”

Read the full story from NASA