Saving Seafood

Beneath the surface: what buoys reveal about ocean acidification

October 15, 2026 — What can a buoy tell us about ocean acidification? Quite a lot, especially when it has been collecting measurements for years.

In the California Current, a slow moving southward current that moves from British Columbia to Baja California, long-term observations help scientists track how ocean conditions change over hours, seasons, and years. Since natural phenomena like upwelling and El Niño rapidly alter water chemistry, continuous observations are vital for separating short-term fluctuations from broader ocean acidification trends.

Join Scripps Institution of Oceanography (Scripps) graduate student, Charles Lindsay, at sea as the recent Ocean Time-Series group, led by Uwe Send, deploy and maintain an ocean monitoring mooring off Southern California. In Anchored in the California Current: A Buoy’s View of Ocean Oscillations, readers are taken aboard a “day in the life” look at the work behind long-term ocean observations and the effort required to keep these instruments collecting data.

Read the full article at NOAA Ocean Acidification Program

Collaborating with Canadian Scientists on Marine Carbon Dioxide Removal Research

October 6, 2026 — I first met Dr. Helen Gurney-Smith in fall 2024, when Dr. Shannon Meseck and I drove just beyond the U.S.-Canada border to the St. Andrews Biological Station in New Brunswick. We went there to study larval sea scallop respiration when exposed to near-future temperature and pH. This past winter, Dr. Gurney-Smith’s research group drove south to visit us at the NOAA Fisheries Milford Lab in Connecticut. We studied how a proposed method of marine carbon dioxide sequestration may affect the single-celled phytoplankton community in the ocean.

This project was a part of a collaborative effort funded by the NOAA Ocean Acidification Program to engage early-career scientists from U.S. and Canadian fisheries agencies in ocean acidification research. Brady Quinn was the co-principal investigator on this project. Quinn, along with Dr. Gurney-Smith, and Erin Miller made up the Fisheries and Oceans Canada team, while Dr. Meseck, Genevieve Bernatchez, Lauren Witick, and I represented NOAA Fisheries.

Studying the Effects of Buffering Ocean Water with Olivine

Increasing carbon dioxide dissolved in the ocean causes ocean acidification, which is a concern for ecosystems. It’s especially harmful for marine life that build calcium carbonate shells, which can degrade in seawater with lower than normal pH. There are several proposed mechanisms to help keep the pH up in the ocean, including methods to increase alkalinity, effectively buffering seawater. One method is to add a naturally occurring mineral known as olivine to high-risk areas. As olivine dissolves in seawater, it breaks down into parts that can raise the pH of the water, making it less acidic. This works much like taking an antacid for an upset stomach.

When olivine breaks down it releases several elements phytoplankton need to grow, including the trace metals magnesium and iron, along with silica. Silica is an important nutrient for the growth of some phytoplankton, called diatoms. Diatoms are an excellent food for shellfish and other small marine grazers. Similar to plants, they can make oxygen from carbon dioxide through photosynthesis, making them an integral part of marine ecosystems. These diatoms use silica to create a glass-like cell wall, and it is possible that the release of extra silica from olivine could stimulate their growth.

Read the full article at NOAA Fisheries

New tool could predict ocean acidity in Bering Sea

August 10, 2026 — Crab populations in the Bering Sea are struggling. And researchers say climate change is a big cause. A new tool described in a study published Aug. 3 in the Journal of Geophysical Research Oceans will help researchers predict one of climate change’s biggest threats to crabs: ocean acidity. The study’s authors hope their work can help crabbers and fishery managers.

“I’m excited with this new model and study,” said Jamie Goen, the executive director of the nonprofit trade association Alaska Bering Sea Crabbers. “It will help us better understand what could be happening and how that might impact fisheries.”

Darren Pilcher, the study’s lead author and an oceanographer at the University of Washington, said he started the study because of requests from fisheries stakeholders.

The ocean absorbs a quarter of our carbon emissions, which make the water more acidic when the two mix. Acidic conditions are harmful for many different animals. This is especially true for shellfish, like crabs.

“They can eat more, and that helps a little bit, only to a certain point,” Pilcher said. “In fact, in some of the previous experiments with red king crab, if you lower the pH to a value of 7.5, the crab just die.”

Scientists have pointed to factors from climate change, like ocean acidification, as the reason the number of Bristol Bay red king crabs has plummeted in recent years. Goen said that other species, like snow crab, have also tanked.

Read the full article at KMXT

NOAA scientists set sail on landmark West Coast Ocean Acidification survey

July 21, 2026 — The following was released by the Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration:

On July 20, 2026, researchers embarked on the NOAA Ocean Acidification Program’s West Coast Ocean Acidification mission (WCOA 2026). Departing from San Diego aboard the University of Alaska, Fairbanks (R/V) Sikuliaq, the team will travel north to Washington, adding important new observations to NOAA’s long-term monitoring of ocean acidification and its impacts on marine resources.

WCOA 2026 will couple ocean chemistry, biology, and physics to build a more comprehensive view of how extreme events impact biogeochemistry and ecosystems.

“Results from past WCOA cruises have provided novel insights into acidification rates and impacts in coastal and estuary habitats that provide our nation with rich fish and shellfish resources,” said Dr. Simone Alin, Supervisory Oceanographer, NOAA/PMEL. Resource managers and harvesters can use this information to inform fisheries management decisions.

This intensive 30-day coastal research cruise aboard the 261-foot research vessel offers scientists a unique opportunity of sampling during an El Niño that is on track to become one of the strongest on record. El Niño brings warmer water and can alter upwelling and precipitation patterns in the region. Phytoplankton and zooplankton communities will follow these warmer waters, which impacts food webs and fisheries as seen during past marine heatwaves.

Two days after the Sikuliaq departs, the PMEL SeaTrac will head south from Washington to collect added coastal measurements during peak ocean acidification and hypoxia season and pick up any El Niño signal that may have made to the northern California Current System this summer. These OA cruises provide critical high-quality data for the U.S. Coastal Large Marine Ecosystems, and are essential for modeling and forecasting changes in ocean acidification and hypoxia to better prepare for future impacts to valued fisheries and ecosystems.

Led by researchers at the University of Washington’s Cooperative Institute for Climate, Ocean, & Ecosystem Studies and PMEL, researchers will collect high-quality ocean chemistry data, phytoplankton, zooplankton, and other observations. Scientists will also collect environmental DNA, which can reveal the diversity and abundance of ocean life in different ocean conditions.

Data collected during WCOA 2026 are essential for validating models and forecasts of ocean conditions like J-SCOPE. This short term (six to nine month) forecast is used for the California Current Integrated Ecosystem Assessment. High quality ocean carbon chemistry data is required to forecast the saturation state of calcium carbonate, the mineral building block used by shellfish like Dungeness crabs, clams, and oysters.

Other coordinated regular coastal fisheries surveys, including the California Cooperative Oceanic Fisheries Investigations (CalCOFI) enhance the impact of WCOA 2026. By conducting biological net tows at established stations, researchers will gain high-quality data on marine life.

Ultimately, the data collected through WCOA 2026 will serve as a foundational benchmark for monitoring, modeling and research in the region. These data will provide calibration information for sensor networks designed to fill measurement gaps between research cruises. With the potential for sampling to occur as ocean conditions change with El Niño, NOAA and our partners will be able to better understand how extreme conditions alter vital marine resources like Dungeness crabs, krill, plankton and other fisheries.

Sullivan reintroduces sweeping bill targeting bycatch, seafloor impacts

July 8, 2026 — U.S. Senator Dan Sullivan (R-Alaska) has reintroduced the Bycatch Reduction Act, legislation that would expand federal efforts to reduce bycatch, limit seafloor impacts from trawl gear, improve fisheries monitoring and increase transparency in fishery management.

According to Sullivan’s office, the bill builds on recommendations from the Alaska Salmon Task Force, which was created through legislation he authored and signed into law in 2022.

The proposal would establish new standards and monitoring requirements designed to keep both midwater and bottom trawl nets off the seafloor, require proven salmon excluder devices on pollock vessels, invest in salmon tagging and genetic sampling, expand ecosystem research, and create a new flume tank testing facility to evaluate fishing gear under simulated ocean conditions. The bill also would reauthorize NOAA’s Bycatch Reduction Engineering Program and encourage fishermen to test new gear and technologies aimed at reducing bycatch and habitat impacts.

Read the full article at the National Fisherman

Study finds ocean acidification is more pervasive than previously thought

June 20, 2025 — New research by an international team of oceanographers has found that ocean acidification has significantly compromised 40% of the global surface ocean, and 60% of the subsurface ocean to a depth of 656 feet (200 meters).

This extent of acidification indicates there has been considerable declines in suitable habitats for important marine species that rely on dissolved calcium and carbonate ions to build their hard shells and skeletons. Impacted economically and ecologically important species include crabs, oysters, mussels and other bivalves, corals and small sea snails known as pteropods that form the base of food webs.

The finding by an international team that included scientists from Plymouth Marine Laboratory in Great Britain, NOAA’s Pacific Marine Environmental Laboratory, the Cooperative Institute for Marine Ecosystem Research at Oregon State University, and the Earth System Science Interdisciplinary Center at the University of Maryland, was based on a detailed analysis of ocean carbon system observations, models and biological assessments. The research was published in the journal Global Change Biology as “Ocean Acidification: another planetary boundary crossed”.

Read the full article at the NOAA Ocean Acidification Program

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