Saving Seafood

Chinook salmon in decline, worsened by Bering Sea heatwave a decade ago: study

July 30, 2026 — Yukon River Chinook salmon numbers have been in a decline for decades. Despite efforts to help the population recover, it has dropped nearly 90 per cent since the 1980s.

Now, a new study from the National Oceanic Atmospheric Administration (NOAA) says a four-year heatwave in the Bering Sea that started about a decade ago has been connected to a more recent drop in population.

Curry Cunningham, one of the co-authors of the study and an associate professor with the University of Alaska Fairbanks, said researchers have noticed two periods of decline in the Chinook salmon population between 2003 and 2023.

Cunningham said before 2013, the salmon experienced a short decline followed by a few years of recovery.

But by 2016, conditions started to change again.

“That’s led to this very depressed state we currently find ourselves in,” Cunningham said. “[It] seems to be associated in time, at least with the onset of this marine heat wave that we saw in the eastern Bering Sea.”

Read the full article at CBC News

ALASKA: Bristol Bay comes off decade of historic runs with moderate and early returns in 2026

July 28, 2026 — Bristol Bay’s sockeye salmon run is coming to a close, and it just surpassed the Alaska Department of Fish and Game’s pre-season forecast of 44 million fish.

The thing that stands out most this year was that early run timing, said Curry Cunningham, an associate professor at the University of Alaska Fairbanks and part of a team that creates pre-season and in-season forecasts for the commercial fishery.

“If we look at the large-run-size years in Bristol Bay, we’ve seen generally since about 2015 they’ve been predominantly on time,” Cunningham said.

The last two years have bucked that trend, he said.

“In 2025 and this year in 2026, we’ve seen earlier run timing to Bristol Bay,” he said. “So a bit of a shift back towards run timings we hadn’t seen in quite a while.”

One of the variables that correlates most strongly with run timing is the extent of sea ice in the late spring, Cunningham said. Bristol Bay sockeye tend to return earlier during years with more sea ice in May.

This year’s run was about three days earlier than the long-term average, according to Cunningham, with a midpoint around July 3 or 4. While three days might seem like a small difference, he said it can have big impacts.

“In Bristol Bay, where the vast majority of the run comes through and arrives inshore over the course of two or three weeks, it actually makes a huge difference,” he said.

Read the full article at Alaska Public Media

ALASKA: For Yukon River residents, salmon shortages have health consequences

Juky 24, 2026 — When 26-year-old Tirzah Bryant was a kid, she knew how to watch the cottonwood trees along the Yukon River for the sign that it was time to fish for salmon.

“We know that the fish are coming when the cotton’s flying from the cottonwood,” she said.

But run collapses and successive fishing closures along the river have rendered the cottonwood signal meaningless.

“I remember that first summer that we couldn’t fish, watching the cotton flying and being like …what it felt like, I was drifting. I’m like, ‘What am I doing?’” she said. That drifting feeling includes interactions with members of her extended family who had moved to cities but used to gather in Galena during fishing season. “They don’t have a reason to come home now,” she said.

Bryant described that odd feeling during a presentation in March at an Anchorage tribal environmental conference. A 2025 graduate of the University of Alaska Fairbanks’ Center for One Health Research master’s degree program, which focuses on the human-animal-environmental health connections in Alaska and the Arctic, she described the One Health concept as fitting perfectly with her family’s traditions.

“Everything is related. So a healthy environment equals healthy animals, which equals healthy humans,” said Bryant, who also holds a biology degree from UAF and is now the environmental and education coordinator for the Louden Tribe, the Galena-based tribal government.

That makes the collapse of runs in the Yukon River — where Indigenous residents’ culture is tied to communal salmon harvesting, preparation and eating — “very detrimental to our people,” she said.

On the Yukon River, salmon runs that used to support a thriving and lucrative commercial harvest have collapsed. The runs of Chinook, also called king salmon, that have been in steady decline since the early 2000s, took a nosedive in recent years; by 2022, Chinook abundance was down 81% below its long-term average, according to fishery biologists. Harvest closures that began in 2020 were extended, and in 2024 an Alaska-Canada agreement established a seven-year moratorium on Chinook salmon fishing in the river to preserve Canadian-origin stocks.

Runs of chum salmon, a species that is generally more abundant in the river, suffered a similar but more sudden crash. A series of chum-harvest closures, even for subsistence purposes, started in 2020, and by 2022 abundance had fallen 92% below the long-term average.

Several factors, working in combination, are blamed for the declines. Scientists cite multiple climate change effects in both the ocean and freshwater bodies used by salmon. Those changes have not only affected the raw numbers of fish but also contributed to the shrinking size of salmon, resulting in smaller egg loads carried to spawning grounds by females.

Other factors cited are interceptions at sea by trawlers targeting groundfish species like pollock, changes forced by increasing loads of Asian hatchery fish in the ocean, past fishery management practices and the parasite Icthyophonus, which thrives in warmer conditions and has a more detrimental effect on Yukon Chinook than on any other type of salmon.

Salmon-protection activists say there is not much that can be done in the short term in Alaska to address those factors, other than to adjust fishery management to cut down on at-sea interception, also known as bycatch.

Read the full article at Alaska Beacon

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.

Bering Sea heat wave cited as trigger for nosedive in Yukon River Chinook salmon

July 13, 2026 — The intense marine heat wave conditions that began roiling the Bering Sea in about 2016 resulted in the lowest winter sea ice extent measured in 150 years, widespread bird and marine mammal die-offs, a drastic shift in fish populations and a crash of snow crab stocks.

Now new research is tying the marine heat wave to the recent collapse of Yukon River Chinook salmon.

A study published in April, written by scientists at the National Oceanic and Atmospheric Administration’s Alaska Fisheries Science Center and University of Alaska Fairbanks, showed the correlation between the extreme heat wave conditions and the nosedive in Yukon River Chinook stocks. The heat wave was accompanied by a dramatic increase in deaths of older juvenile and adult Chinook that, had they survived, would have returned from the ocean to freshwater spawning grounds, the study found.

The study was published in the journal Ecological Applications.

The Yukon River’s runs of Chinook, also called king salmon, have been in a long-term decline since their past heyday, when they numbered in the hundreds of thousands and the river was one of the biggest sources of that salmon species.

The sharp downturn in recent years resulted in a 2022 return that was the lowest on record. Widespread fishery closures have been in effect for years along the Yukon River system in both Alaska and Canada.

Read the full article at Alaska Beacon

Alaska researchers using tagging data to reduce fishing bycatch

June 11, 2026 — A stream of data more than a decade in the making is helping a team of Alaska researchers’ efforts to boost the health of the local salmon population and the bottom line of fishing trawlers.

A University of Alaska Fairbanks research team has translated a trove of data from a chinook salmon tagging program into a predictive model that could help reduce bycatch by fishing trawlers.

Chinook salmon range from the ocean’s surface to depths where trawl nets target groundfish species. The researchers’ model uses more than 700,000 data points between Southeast Alaska and the Bering Sea to predict how chinook will be distributed across the water column. With that information, trawlers can potentially adjust their operations to reduce inadvertent salmon catches.

Read the full article at Peninsula Clarion 

Chinook salmon tagging data aims to help reduce trawler bycatch

June 11, 2026 — Fisheries scientists at the University of Alaska Fairbanks are on a mission to find out where Chinook salmon are at all times, not to catch them, but to avoid them.

Their research draws on a trove of data from a Chinook salmon tagging program, with a focus on helping commercial trawl harvesters avoid the depths and areas where these fish risk becoming bycatch, and where they may also be adversely affected by naval exercises in the Gulf of Alaska used to train U.S. military forces for combat at sea.

Chinook and chum salmon have been hard hit in recent years by rising ocean temperatures, anthropogenic impacts, and increased microplastic pollution.

Bycatch limits already in place for declining Chinook stocks shut down the trawl fishery in Kodiak in 2024, when two trawl boats caught so many Chinooks over a single weekend that the entire fleet had to stop fishing, leaving most of their total allowable groundfish catch in the water.

Read the full article at the

Salmon tagging data could help trawlers reduce bycatch

June 9, 2026 — A University of Alaska Fairbanks research team has translated a trove of data from a Chinook salmon tagging program into a predictive model that could help reduce bycatch by fishing trawlers.

Chinook salmon range from the ocean’s surface to depths where trawl nets target groundfish species. The researchers’ model uses more than 700,000 data points between Southeast Alaska and the Bering Sea to predict how Chinook will be distributed across the water column. With that information, trawlers can potentially adjust their operations to reduce inadvertent salmon catches.

To develop the model, the team used 13 years of data from tagged Chinooks through an ongoing project led by Andrew Seitz, a professor at UAF’s College of Fisheries and Ocean Sciences. The tags collect data every 5-10 seconds and transmit it to satellites. That provides a much more comprehensive dataset than is available from catching tagged salmon.

Tagging data included details such as depth, time of day, temperature and light levels. A separate dataset from Copernicus Marine Service added environmental context.

Graduate fisheries student Marcel Gietzmann-Sanders used machine learning to detect patterns in that massive dataset. He turned them into detailed charts showing the depth where Chinooks are most likely to be found at various times and locations. The project is described in a recently published paper in the journal Animal Biotelemetry.

“It shows what you can find out when you collect enough data about a species over a long enough time,” Gietzmann-Sanders said.

Better tools for reducing bycatch are important for both the health of declining Chinook populations and the economics of the trawl fleet. Fishing for pollock, a type of groundfish that supplies the largest catch volumes in the U.S., can be shut down if bycatch limits are exceeded. As recently as 2024, two fishing boats had enough Chinook salmon bycatch over a single weekend to close the fishery.

Read the full article at University of Alaska Fairbanks News

NOAA researchers use genetic tools to improve understanding of Alaska’s Pacific cod stocks

May 1, 2026 — NOAA researchers from the University of Alaska Fairbanks and Alaska BioMap have been working on identifying genetic stocks of Pacific cod in Alaska to build a cost-effective genetic database full of assessments.

Breaking the population into four stocks – Bering Sea, Gulf of Alaska, Aleutian Islands, and Pacific Coast – the assessment found that none of the four have been or are subject to overfishing threats, as measured by estimating the spawning biomass, or the number of females able to reproduce, according to a release by NOAA.

Read the full article at SeafoodSource

Modified groundfish nets limit killer whale entanglements

November 4, 2025 — A large mesh panel, known as a “killer whale fence,” in Bering Sea deep-water flatfish trawl gear is proving successful at preventing killer whale entanglement in the lucrative commercial flounder and sole fisheries.

The modified gear, first tested fleetwide in 2024, resulted in a single entanglement for the whole summer season.  The fleet’s 2025 season ended without any mortalities, according to an Oct. 28 report by researchers at the University of Alaska Fairbanks.

The net modification was developed through a collaborative effort between UAF researcher Hannah Myers and the Alaska Seafood Cooperative, which coordinates a fleet targeting flounder and sole.  For 2023, the Bering Sea commercial flounder and sole fisheries were valued at over $45 million combined. Key species in this fishery complex include yellowfin sole and flathead sole, along with other flatfish managed by the North Pacific Fishery Management Council.

Groundfish captains working in the summer fishery first began noticing significantly more killer whale activity around their nets starting about 2020. Then, in 2023, there was a sudden rise in the entanglement of orcas in their nets.

Read the full article at the National Fisherman