Saving Seafood

NOAA Scientists Discover Repeat Spawning in Pacific Capelin

August 12, 2026 — For certain fish species, like Pacific salmon, reproduction is a once-in-a-lifetime event, known as semelparity. Many other fish are iteroparous—meaning they can spawn repeatedly throughout their lives. New research by NOAA’s Alaska Fisheries Science Center reveals the first evidence that Pacific capelin can be repeat spawners.

Over the past decade, the North Pacific Ocean has faced extreme climate variability, including marine heatwaves that severely impacted capelin populations. Understanding capelin’s reproductive flexibility under these fluctuating conditions is crucial for predicting their annual reproductive potential and long-term resilience. Capelin abundance is also an important indicator of the marine ecosystem health.

Examining Reproductive Flexibility in Fluctuating Environments

Historically, the life history, ecology, behavior, and population dynamics of Pacific capelin have not been studied as well as their commercially important counterparts in the Atlantic. In North Pacific and Arctic ecosystems, Pacific capelin serve as a major forage fish and primary food source for Steller sea lions, humpback whales, and other marine mammals. They also are a key subsistence resource and an important food source for commercially important groundfish.

Capelin are short-lived—typically surviving only 1 to 4 years. Their abundance fluctuates wildly in changing environments, leading to multiyear population crashes during marine heatwaves. Recent research highlights that these heatwaves shrink capelin distribution and deplete their energy reserves. Ultimately, these combined stressors leave capelin highly vulnerable to mortality and put the predator populations that rely on them at risk of decline.

In this new experimental study of captive fish, NOAA scientists looked more closely at the spawning potential of Pacific capelin. They researched their life history and how they respond to shifting environments.

Read the full article at NOAA Fisheries

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

ALASKA: A parasite that thrives in warm conditions adds to Yukon River salmon woes

July 23, 2026 — When Stan Zuray began noticing white spots, a mushy texture and a weird “sour watermelon” smell in the Chinook salmon he was pulling from the Yukon River, he knew something was going wrong.

That was back in the 1980s. By about 1990, he and others just stopped fishing what he calls “the ass end of the king run” because the fish were so low in quality, he said.

Everyone stopped fishing earlier than normal, he said. “You just get tired of the bum-looking fish,” said Zuray, who lives in the village of Tanana but still has his Boston accent after spending half a century in the Alaska Bush.

It was an ominous turn for a river famous for producing some of the world’s biggest and most prized wild salmon. Chinook salmon, also known as king salmon, is so exalted among the five Pacific salmon species that it is designated Alaska’s official state fish. And the Yukon River Chinooks were traditionally considered among the best of the best.

The culprit in the mushy, weird-smelling salmon was Ichthyophonus, a parasite found in oceans around the world, but a particular menace to the health of Yukon River Chinook salmon.

Zuray is known nationally as a featured character in the reality TV show “Yukon Men” and from his own YouTube broadcasts and a biographical documentary. Within Alaska fishing circles, he is well known as a former subsistence representative on the Alaska Board of Fisheries.

In the science community, he is known for his work as one of the early Yukon River Ichthyophonus researchers. He set up a program and documented infection rates at Rampart Falls, a spot on the river near the tiny Alaska village of Rampart, collecting data that has become critical to current studies.

Zuray said he could smell the infection as fish dried on racks in the traditional way and the parasite multiplied rapidly in the warm sunlight. He dissected samples and documented how Icthyophonus attacks a salmon’s heart. “I squish it in my hand by closing my fingers, and the heart will ooze out through my fingers,” he said.

Read the full article at Alaska Beacon