Saving Seafood

The Effects of Climate Change on Sharks

July 29, 2021 — The following was released by NOAA Fisheries:

Climate Solutions Start with Research

Understanding the effects of climate change on sharks and other fish populations is an emerging area of study and a priority for NOAA Fisheries. Climate change is causing warming seas, acidification, rising sea level, and other long-term shifts in the environment. It is already affecting numerous marine species in complex ways. Sharks are no exception. The impacts of climate change on marine life are expected to continue into the future, potentially resulting in:

  • Shifts in the distribution of fish populations
  • Changes in migratory patterns
  • Changes in the availability of suitable habitat
  • Shifts in population sizes
  • Changes in the availability of prey

We are conducting research on many species and across fisheries to find ways to characterize such ecological shifts and address climate vulnerability and resilience.

The Range of Change

A climate vulnerability assessment for 82 fish species, including some sharks, off the northeastern United States found that impacts are likely to vary by species. In general, sharks may have lower overall vulnerability than other marine organisms (e.g., shellfish, salmon, or eels). They are less likely to experience changes in abundance. However, because of their extensive range, sharks have a high likelihood of shifting their distributions or expanding into new habitats to follow preferable ocean conditions.

In Atlantic and Pacific U.S. waters, many fish species are shifting northward as the oceans continue to warm. For example, species like the thresher shark, which are common off southern California, are expected to become more common off Alaska along the Pacific coast. Along the northeastern United States, smooth dogfish may actually gain suitable habitat, whereas thorny skate (a shark relative) may lose habitat as the region warms. Some species are also shifting to deeper, cooler waters as shallow coastal environments warm.

Read the full release here

Oregon Bill Aims to Fund Actions Supporting Fisheries, Communities in face of Changing Ocean

July 20, 2021 — Oregon is taking healthy oceans seriously. The state legislature passed House Bill 3114 in what proponents call a historic Oregon first in the fight against ocean acidification and hypoxia. It will help retain the successful sport and commercial fisheries on which coastal economies depend, proponents say.

It also shows Oregon leaders’ awareness of the importance of healthy oceans, according to a press release from the Oregon Department of Fish and Wildlife. Oregon is an epicenter for acidification and hypoxia and was one of the first places in the world to observe direct impacts of ocean change when oyster hatchery production collapsed in 2007 from ocean acidification.

Read the full story at Seafood News

Oregon fishing families face climate change impacts

June 7, 2021 — For four generations Kevin and Taunette Dixon’s families have followed the rhythm of the sea: Harvesting groundfish, such as cod and pollock, early in the year. Pink shrimp beginning in April, sometimes followed by albacore in the fall. Then, Dungeness crab, Oregon’s biggest and most lucrative fishery, just in time to bring in holiday cash.

It’s been the same for fishing families up and down the Oregon Coast.

But the ocean is changing, and with it, life in tight-knit coastal communities.

For the past six years, Oregon’s traditional Dec. 1 Dungeness opening has been significantly delayed because elevated domoic acid levels make the crab unsafe to eat.

The toxin comes from harmful algal blooms caused by marine heatwaves, which are increasing in frequency and intensity.

The warming planet can actually fill the catch with poison.

And this is only one effect of climate change.

Oregon now has a regular “hypoxia season,” when ocean oxygen levels near the sea floor plummet and some sea life flees the region or dies.

In 2017, a huge hypoxia event occurred off Washington. The next year it extended into Oregon, resulting in almost no halibut caught. Over the next two years, Oregon commercial crabbers reported pulling up pot after pot of dead, suffocated crabs.

Read the full story from the Salem Statesman Journal at USA Today

Does ocean acidification alter fish behavior? Fraud allegations create a sea of doubt

May 7, 2021 — When Philip Munday discussed his research on ocean acidification with more than 70 colleagues and students in a December 2020 Zoom meeting, he wasn’t just giving a confident overview of a decade’s worth of science. Munday, a marine ecologist at James Cook University (JCU), Townsville, was speaking to defend his scientific legacy.

Munday has co-authored more than 250 papers and drawn scores of aspiring scientists to Townsville, a mecca of marine biology on Australia’s northeastern coast. He is best known for pioneering work on the effects of the oceans’ changing chemistry on fish, part of it carried out with Danielle Dixson, a U.S. biologist who obtained her Ph.D. under Munday’s supervision in 2012 and has since become a successful lab head at the University of Delaware (UD), Lewes.

In 2009, Munday and Dixson began to publish evidence that ocean acidification—a knock-on effect of the rising carbon dioxide (CO2) level in Earth’s atmosphere—has a range of striking effects on fish behavior, such as making them bolder and steering them toward chemicals produced by their predators. As one journalist covering the research put it, “Ocean acidification can mess with a fish’s mind.” The findings, included in a 2014 report from the Intergovernmental Panel on Climate Change (IPCC), could ultimately have “profound consequences for marine diversity” and fisheries, Munday and Dixson warned.

But their work has come under attack. In January 2020, a group of seven young scientists, led by fish physiologist Timothy Clark of Deakin University in Geelong, Australia, published a Nature paper reporting that in a massive, 3-year study, they didn’t see these dramatic effects of acidification on fish behavior at all.

Read the full story at Science Magazine

April Edition of NOAA Navigator Now Available!

April 2, 2021 — The following was released by NOAA Fisheries:

The NOAA Navigator is a bi-monthly informational insert that we publish in Commercial Fisheries News.

The April issue of the Navigator is now available. Articles in this edition include:

  • Northern Gulf of Maine Scallop Season Reminder
  • Coonamessett River Restoration
  • Study on Ocean Acidification
  • Fisheries Stock Assessments Underway
  • Reporting and Permitting Updates

Questions?

Contact Kate Swails, Regional Office, 978-282-8481

Targeted Ocean Protection Could Offer 3x The Benefits

March 23, 2021 — The new paper is the most comprehensive assessment to date of where strict ocean protection can contribute to a more abundant supply of healthy seafood and provide a cheap, natural solution to address climate change, in addition to protecting embattled species and habitats.

As reported in Nature, researchers identified specific areas of the ocean that could provide multiple benefits if protected. Safeguarding these regions would protect nearly 80% of marine species, increase fishing catches by more than 8 million metric tons, and prevent the release of more than one billion tons of carbon dioxide by protecting the seafloor from bottom trawling, a widespread yet destructive fishing practice.

BLUEPRINT TO PROTECT NATURE

The study is also the first to quantify the potential release of CO2 into the ocean from trawling. It finds that trawling pumps hundreds of millions of tons of CO2 into the ocean every year.

“Ocean life has been declining worldwide because of overfishing, habitat destruction, and climate change. Yet only 7% of the ocean is currently under some kind of protection,” says lead author Enric Sala, an explorer in residence at the National Geographic Society.

“In this study, we’ve pioneered a new way to identify the places that—if protected—will boost food production and safeguard marine life, all while reducing carbon emissions,” Sala says. “It’s clear that humanity and the economy will benefit from a healthier ocean. And we can realize those benefits quickly if countries work together to protect at least 30% of the ocean by 2030.”

To identify the priority areas, researchers analyzed the world’s unprotected ocean waters, focusing on the degree to which they are threatened by human activities that can be reduced by marine protected areas (for example, overfishing and habitat destruction).

Read the full story at Futurity

OSU researcher leads NOAA-funded project to study West Coast response to ocean acidification

March 4, 2021 — The following was released by Oregon State University:

An Oregon State University researcher is part of a new federally supported project investigating how communities along the West Coast are adapting to ocean acidification, with the goal of determining what they need to be more resilient.

Ana K. Spalding, an assistant professor of marine and coastal policy in OSU’s College of Liberal Arts, is leading a team looking into how shellfish industry participants in several towns along the Oregon and California coasts are responding to ocean acidification and where gaps in policy or resources have left them vulnerable.

The $1 million, three-year interdisciplinary project is funded by the National Oceanic and Atmospheric Administration (NOAA) through its Ocean Acidification Program. At OSU, Spalding is working with Erika Wolters, assistant professor of public policy, and Master of Public Policy students Victoria Moreno, Emily Griffith and Ryan Hasert.

“The goal of this project is to better align policy responses with the immediate and very local needs of shellfish-reliant communities,” Spalding said. “This is both understanding that vulnerability and proactively thinking, ‘What can we do to respond to better support members of the shellfish industry and their needs?’”

Ocean acidification and its impact on shellfish first became a major concern for West Coast farmers after a 2007 mass oyster larvae die-off at the Whiskey Creek Shellfish Hatchery in Netarts Bay, Oregon. OSU scientists definitively linked that die-off to increased carbon dioxide in the water in a 2012 study.

Read the full release here

In the Aleutians, climate change and ocean acidification impacts add to legacies of past exploitation

March 2, 2021 — In the waters around the Aleutian Islands, the 1,200-mile chain that arcs across the southern edge of the Bering Sea from Alaska to Kamchatka, modern climate change has layered atop a centuries-old legacy of human assaults to send combined impacts cascading through the marine ecosystem.

Evidence is in the once-colorful corals that have nurtured schools of fish supporting some of the world’s largest commercial seafood harvests. Under the clear waters is a pale world that signals a habitat in a tailspin.

The pale-pink scene shows the slow death of cold-water coral reefs that used to be buffered by the kelp, said Doug Rasher, a marine ecologist with the Maine-based Bigelow Laboratory for Ocean Science. “We’re passing the tipping point where these reefs have persisted and been able to survive,” said Rasher, who led a study of the coral ecosystem’s downward spiral.

The reefs are dying because they are being attacked by an exploding population of sea urchins. Having mowed down the surrounding kelp forest, the urchins are consuming the algae that the reefs produce to build their structures. The urchin population is booming because the sea otters that used to eat them have disappeared.

Climate change also weakens the corals. Warmer waters make the urchins grow faster, requiring them to eat more. Rasher’s study examined the algae’s microscopic growth layers and found that urchin foraging increased by up to 60 percent since preindustrial times.

Adding to the assault is ocean acidification, to which the Bering Sea is especially vulnerable. The shallow Bering, with its relatively cold waters, abundant sea life and wide seasonal fluctuations, is naturally primed to hold carbon. And carbon emitted by fossil-fuel burning is absorbed from the atmosphere into the water, lowering pH levels and threatening calcium-building life forms — not just the coral reefs, but shellfish such as crabs, as well the tiny creatures such as pteropods that make up the diet of fish like salmon.

Read the full story at Arctic Today

Lobster research explores ocean warming effects

February 22, 2021 — A team of researchers from the University of Maine’s Darling Marine Center in Walpole and Bigelow Laboratory for Ocean Sciences in East Boothbay and the Maine Department of Marine Resources in West Boothbay Harbor recently published their research on the effects of ocean warming and acidification on gene expression in the earliest life stages of the American lobster.

The work was published in the scientific journal Ecology and Evolution with collaborators from the University of Prince Edward Island and Dalhousie University in Canada.

The team’s experiments examined the gene regulatory response of post-larval lobsters to the separate and combined effects of warming and acidification anticipated by the end of the 21st century. They found that genes regulating a range of physiological functions, from those controlling shell formation to the immune response, are either up- or down-regulated. Importantly, they observed that the two stressors combined induced a greater gene regulatory response than either stressor alone.

Read the full story at The Ellsworth American

MASSACHUSETTS: Panel: ocean acidification threatens shellfish sector

February 12, 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.

Read the full story at Wicked Local