Saving Seafood

Ecosystem-Based Fisheries Management Strengthens Resilience to Climate Change

September 15, 2020 — The following was released by NOAA Fisheries:

Ecosystem-based fisheries management (EBFM) has been applied in Alaska for decades with great success. Alaska’s valuable commercial fisheries are among the most productive and sustainable in the world. However, current EBFM policies were not designed to address climate change.

A new study evaluates the future performance of EBFM in the eastern Bering Sea. The innovative experiment projects that EBFM can forestall climate-driven collapse of key Alaska fisheries better than other management policies. This management approach considers the impacts on fish stock productivity from environmental variables, such as changing ocean conditions, and socio-economic factors. It can help fishery managers and fishermen in planning for the future.

“Ecosystem-based management doesn’t just help fish, it helps fishing communities. It is the best strategy we have to provide harvest stability in the coming years. It buys time for Alaska fisheries and fishing communities to prepare and adapt. EBFM is going to be a vital tool for us under climate change,” said Kirstin Holsman, biologist at NOAA Fisheries’ Alaska Fisheries Science Center. “But no matter how effective management is, by mid-century—maybe sooner—Alaska fisheries may reach a tipping point of rapid decline in the eastern Bering Sea if climate change continues on the current trajectory and fish and fisheries are not able to adapt to these changing conditions. To guarantee long-term success, we need to couple EBFM with global climate change mitigation.”

Read the full release here

Study finds declines in size of Alaska salmon

September 15, 2020 — A recent study that dove into more than 60 years of records from the Alaska Department Fish and Game found that salmon returning to Alaska’s rivers are on average smaller than they were in the past.

The study, headed up by biologists from the University of California Santa Cruz and the University of Alaska, Fairbanks, attributes declines in salmon size to “shifting age structures associated with climate and competition at sea.”

Read the full story at Seafood Source

NOAA taps David Legates, professor who questions the seriousness and severity of global warming, for top role

September 14, 2020 — The Trump administration has tapped David Legates, an academic who has long questioned the scientific consensus that human activity is causing global warming, to help run the agency that produces much of the climate research funded by the U.S. government.

Legates, a University of Delaware professor who was forced out of his role as that state’s climatologist because of his controversial views, has taken a senior leadership role at the National Oceanic and Atmospheric Administration (NOAA).

The agency, which oversees weather forecasting, climate research and fisheries, has until now continued its climate research and communications activities unfettered by political influence. For that, NOAA stands in stark contrast to the Environmental Protection Agency and science agencies at the Interior Department, where the Trump administration has dismissed and sidelined climate scientists or altered their work before publication.

The move to install Legates as the new deputy assistant secretary of Commerce for environmental observation and prediction, a position that would report directly to acting NOAA Administrator Neil Jacobs, is raising concerns in the science community that this could be a White House-orchestrated move to influence the agency’s scientific reports.

Read the full story at The Washington Post

Artificial Reefs Take on a Towering Presence as Havens for Marine Predators

September 10, 2020 — The following was released by Duke University:

Acting like high-rise timeshares in the sea, shipwrecks and other artificial reefs can support dense populations of sharks, mackerels, barracudas, jacks and other large migratory marine predators essential to ocean health, according to a new study at 30 sites along the North Carolina coast.

Predator densities were up to five times larger at the 14 artificial reefs surveyed in the study than at the 16 nearby natural reefs that also were surveyed

Shipwrecks, especially those that rose between 4 and 10 meters up into the water column, were by far the fishes’ favorite. At some sites, they supported predator densities up to 11 times larger than natural reefs or low-profile artificial reefs made of concrete.

“These finding tell us two important things. One is that artificial reefs can support large predators, potentially supplementing natural reefs if the design and placement of the artificial reefs are strategic,” said Avery Paxton, research associate with the National Oceanic and Atmospheric Administration’s National Centers for Coastal Ocean Science (NCCOS) in Beaufort, N.C., who led the study.

“The second thing it tells us is that when it comes to designing artificial reefs, there may be such a thing as a height advantage. We observed more fast-moving predators that live and hunt in the water column at the taller reefs in our study,” she said.

Climate change, pollution, development and other stresses have accelerated the decline of natural reef ecosystems across much of the world’s oceans in recent years, forcing large predators who formerly fed in the water column around the reefs to venture outside their normal migratory routes and native ranges in search of suitable alternatives.

Because these predators help maintain healthy and sustainable populations of species lower in the food web, providing suitable habitat for them as expediently as possible is critical, said Brian Silliman, Rachel Carson Distinguished Professor of Marine Conservation Biology at Duke University’s Nicholas School of the Environment, who collaborated on the study.

Read the full release here

UMaine’s ‘hot water’ study will examine lobster industry’s vulnerable areas

September 9, 2020 — Maine’s lobster fishery faces serious challenges related to climate change.

But a new research project at the University of Maine will develop indicators of resilience for the lobster industry that can be used to detect where the industry is most vulnerable to climate change.

The research will be led by UMaine in collaboration with the lobster industry, the Maine Department of Marine Resources, Maine Center for Coastal Fisheries and Maine Lobstermen’s Association.

UMaine was awarded $125,808 for the project, called “Fishing in hot water: Defining sentinel indicators of resilience in the American lobster fishery,” by the Sea Grant American Lobster Initiative.

The initiative is funded by the National Oceanic and Atmospheric Administration’s National Sea Grant College Program.

Read the full story at MaineBiz

PFMC: Ad Hoc Climate and Communities Core Team online meeting September 29, 2020

September 8, 2020 — The following was released by the Pacific Fishery Management Council:

The Pacific Fishery Management Council’s (Council) Ad Hoc Climate and Communities Core Team (CCCT) will hold an online meeting, which is open to the public. This meeting will be held Tuesday, September 29, 2020, from 3 p.m. to 4:30 p.m. Pacific Time, or when business for the day has been completed.

Please see the CCCT meeting notice on the Council’s website for details.

For further information:

  • Please contact Pacific Fishery Management Council staff officer Dr. Kit Dahl at 503-820-2422; toll-free 1-866-806-7204.

ALASKA: Harbor porpoise bycatch near Point Barrow contributes to larger study on Bering Sea population

September 4, 2020 — When James Judkins began pulling up his fishing nets out near Point Barrow this month, the weight of the catch pulled back at him.

“Man, this is a really big fish,” Judkins thought. Then, he glimpsed the dorsal fin. Then another. “Dolphins?” he wondered.

Close. Harbor porpoises, a marine mammal resembling dolphins, but in the same family as whales, have made several appearances in Utqiaġvik recently.

In recent weeks, local fishermen have caught at least four porpoises in subsistence fishing nets near Point Barrow. Judkins recovered two, along with a seal, on Aug. 12 in Elson Lagoon. The other two were bycatches in Christian Stein and Charlie Sikvaguyak’s separate nets set in the same area. For some fishermen, it was their first time seeing the mammal.

Read the full story at the Anchorage Daily News

Pink Salmon May Benefit as Pacific Arctic Warms

September 1, 2020 — The following was released by NOAA Fisheries:

The Pacific Arctic is undergoing a rapid transformation. As temperatures rise and sea ice melts, some species will do better than others. A new study suggests that pink salmon may be one of those species.

“Our results suggest that warming is both increasing freshwater habitat and improving early marine survival of pink salmon in the northern Bering Sea,” said Ed Farley, NOAA Fisheries biologist at the Alaska Fisheries Science Center, who led the study.

The study provides insight into the response of pink salmon to climate change. The findings are valuable information for commercial and subsistence fisheries, and fishing communities, preparing for future changes.

“Subsistence harvesters would like to know what foods may be available to them now and into the future,” Farley said.

“The importance of fish in Arctic subsistence economies cannot be overstated; they are some of the most commonly eaten foods,” said coauthor Todd Sformo, biologist at the North Slope Borough Department of Wildlife Management.

“In the past on the North Slope, salmon have been used for dog food and even considered nuisance fish when interfering with preferred species such as aanaakliq or broad whitefish in the inland rivers. Recently, there seems to be a change both qualitatively and quantitatively in the use of salmon as a main dish and for smoking.

“Participating in this study allowed me to present a subsistence perspective, learn how fellow researchers measure production dynamics, and better understand how pink salmon are responding to climate warming in the northern Bering Sea. While this research is further south than the waters surrounding the North Slope, it is a beginning of our attempt to account for potential change in subsistence fishing.”

Read the full release here

Judge Dismisses Lawsuit Seeking Rhode Island Climate Action

September 1, 2020 — Last week Rhode Island Superior Court Judge Melissa Darigan dismissed a complaint filed by Nature’s Trust Rhode Island against the Department of Environmental Management (DEM). On behalf of 13 young Rhode Islanders and the Sisters of Mercy Ecology, the group filed suit after DEM had rejected an attempt that would have forced the state to address, systematically and meaningfully, the climate crisis and to take responsibility for its share of greenhouse-gas emissions.

Peter Nightingale, president of the Nature’s Trust Rhode Island board, said the judge’s recent ruling “makes it clear that the Rhode Island courts shirk their responsibility to protect the environment.”

The University of Rhode Island physics professor pointed to House Speaker Nicholas Mattiello’s statement at the beginning of this year that “there’s nothing Rhode Island can do to address climate change in a way that is real or impactful” as perhaps the most vivid example of political negligence.

Read the full story at ecoRI

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