Alaska

Small fish size linked to poorer runs of chinook in Alaska’s biggest rivers

Published

1 year ago

December 7, 2024

Small fish size linked to poorer runs of chinook in Alaska’s biggest rivers

Juvenile Chinook salmon, also known as king salmon, are seen on July 12, 2006, swimming in the water in Togiak National Wildlife Refuge in Southwest Alaska. A new University of Alaska Fairbanks-led study has found that smaller Chinook salmon sizes are resulting in reproduction of fewer salmon in the Yukon and Kuskokwim river systems, leading to lower numbers returning back to spawning grounds in subsequent generations. (Photo provided by U.S. Fish and Wildlife Service)

The shrinking size of Alaska salmon, a decades-long trend linked in part to warming conditions in the ocean, is hampering the ability of chinook in Alaska’s two biggest rivers to produce new generations needed to maintain healthy populations, a new study shows.

The University of Alaska Fairbanks-led study shows how the body conditions of chinook salmon, combined with extreme heat and cold in the ocean and freshwater environments, have converged in the Yukon and Kuskokwim river systems to depress what is termed “productivity” — the successful reproduction that results in adult spawners returning to the same area.

The study examines 26 different populations of chinook in those two river systems in areas from Western Alaska to the Yukon River uplands in Canada. Chinook runs in those rivers have faltered in recent years, and the situation has been so dire on the Canadian part of the Yukon that U.S. and Canadian officials earlier this year suspended all harvests of Canadian-origin chinook for seven years.

The analysis of multiple factors and conditions revealed that fish size was a major factor that determined productivity, defined as adult salmon returning to spawning grounds successfully producing a next generation of adults to come back to the same spawning area.

There are explanations for the relationship of size to productivity success, said Megan Feddern, who led the study when she was a postdoctoral researcher at UAF’s College of Fisheries and Ocean Sciences. She is now a fish biologist with the National Oceanic and Atmospheric Administration.

Smaller female fish carry fewer eggs to spawning grounds, as has been shown by prior research. Additionally, those eggs are in poorer condition than eggs in big fish, Feddern said. And smaller fish, whether female or male, are less robust and less likely to make the full journey, especially up the full length of the nearly 2,000-mile Yukon River, she said.

“It carries over into that next generation,” Feddern said. “The females and males that are making the migration and have that better body condition are able to produce more, but then it also sets that next generation up for success.”

Clouds hang over the hills along the banks of the Yukon River on Aug. 21, 2014, in Yukon-Charley Rivers National Preserve. The Yukon River flows nearly 2,000 miles from Canada’s Yukon Territory to the Bering Sea. (Photo provided by the National Park Service)

Other factors found to have hindered productivity for Yukon and Kuskokwim fish were warm summers at sea during the first year in the ocean for any given chinook salmon age group; unusually winter cold conditions encountered by fish in their first winters at sea; and unusually warm temperatures in freshwater river habitat.

The dangers of overly warm conditions for salmon have been documented before, as shown by past records of heat stress suffered by Yukon River salmon in 2016 and 2017. But just why cold winters in the Bering Sea are such problems is yet to be explained, Feddern said.

“I don’t think we have a good grasp on what exactly is happening when it comes to those cold winters,” she said. “We suspect it’s just, these young adults that are in the ocean are just not surviving through those really cold conditions.”

High runoff was another condition harming productivity for some populations, notably in the Canadian part of the Yukon River system, the study found.

The study evaluates conditions only up to 2016, so it misses events that happened during the recent and prolonged Bering Sea marine heatwaves, along with heat-related events in freshwater areas. For example, it does not include the ultra-warm river temperatures in 2019, a record-hot year in Alaska, that were blamed for a mass die-off of salmon in the Koyukuk River, a Yukon River tributary, and die-offs elsewhere.

Feddern said there are plans to update the study with data from those more recent years.

The study’s research questions were inspired by community concerns. Those were expressed at a 2022 workshop in Fairbanks that was hosted by UAF’s International Arctic Research Center.

There, as residents of river communities talked about their experiences and their relationships with fish, UAF researchers learned that the shrinking salmon size was a major worry, Feddern said.

“I would say that the size component that was included in this research was really driven by folks being concerned about that,” she said.

A man untangles his net in his boat on the Kuskokwim River in Bethel, Alaska on Oct.10, 2023. The Kuskokwim is Alaska’s second-longest river, and communities along it depend on its salmon for their diet, economy and culture. (Photo by Claire Stremple/Alaska Beacon)

All species of Pacific salmon have been shrinking in size over the past decades, but the change has been most dramatic among chinook salmon, also known as king salmon.

The smaller size has negative impacts on the fishing industry. In the Bristol Bay region, the site of the world’s biggest sockeye salmon runs, the average sockeye salmon size this year was the smallest on record, according to the Alaska Department of Fish and Game. Even though this year’s total number of fish that returned was above the 20-year average, the total number of fish commercially harvested was below average, the department reported. The reason appears to be related to fish size, with many of the returning salmon being too small to be caught in fishers’ nets, a department biologist said in September.

Originally published by the Alaska Beacon, an independent, nonpartisan news organization that covers Alaska state government.

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Alaska

Alaska House advances bill to boost free legal aid for vulnerable Alaskans

Published

8 hours ago

March 2, 2026

Press Room

Alaska House advances bill to boost free legal aid for vulnerable Alaskans

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Alaska

Marten visits are a glimpse into mystery

Published

20 hours ago

March 1, 2026

Press Room

Marten visits are a glimpse into mystery

A trapper fresh out of the Cosna River country in Interior Alaska said he can’t believe how many martens he had caught in a small area so far this winter.

Friends are talking about the house-cat size creatures visiting their wood piles and porches. Could this be a boom in the number of these handsome woodland creatures?

Since the late 1970s, the University of Alaska Fairbanks’ Geophysical Institute has provided this column free in cooperation with the UAF research community. Ned Rozell is a science writer for the Geophysical Institute. Portions of this story appeared in 2000.

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Alaska

Alaska Sports Scoreboard: Feb. 28, 2026

Published

1 day ago

March 1, 2026

Press Room

High school

Basketball

Girls

Monday

Kenai Central 63, Nikiski 33

Colony 68, Grace Christian 46

Tuesday

South 33, East 22

Service 62, Dimond 47

Redington 47, Houston 17

Wasilla 60, Mountain City Christian Academy 44

Kenai Central 54, Homer 27

Bartlett 53, Chugiak 29

Mt. Edgecumbe 59, Sitka 50

Wednesday

Shishmaref 82, Aniguiin 34

Shaktoolik 73, Anthony Andrews 25

Savoonga 61, White Mountain 56

Glennallen 68, Nenana 26

Seward 72, Houston 8

Service 65, South 26

Brevig Mission 65, Koyuk Malimiut 47

Chief Ivan Blunka 67, Manokotak 30

Thursday

White Mountain 76, Anthony Andrews 50

Hoonah 44, Skagway 21

Koyuk Malimiut 53, Aniguiin 51

Nunamiut 74, Kali 17

Glennallen 25, Delta 20

Birchwood Christian 42, Nanwalek 24

Ninilchik 33, Lumen Christi 30

Dimond 59, Chugiak 54

Shaktoolik 57, Savoonga 24

Colony 43, Mountain City Christian 41

Alak 67, Meade River 66

Lathrop 42, West Valley 34

Seward 78, Nikiski 32

Grace Christian 56, Soldotna 41

Kenai Central 56, Houston 10

Wasilla 72, Palmer 27

Bristol Bay 55, Chief Ivan Blunka 30

Nome-Beltz 33, Bethel 24

Scammon Bay 46, Ignatius Beans 28

Aniak 83, Akiachak 45

Shishmaref 53, Brevig Mission 51

Metlakatla 64, Haines 21

Friday

Chief Ivan Blunka 68, Togiak 38

Meade River 80, Nuiqsut Trapper 34

Nunamiut 68, Alak 50

Cook Inlet Academy 33, Birchwood Christian 32

Meade River 71, Kali 46

Kalskag 62, Akiachak 47

Hoonah 39, Kake 37

Soldotna 36, Palmer 23

Delta 54, Valdez 45

Unalakleet 61, Chevak 45

Minto 46, Hutchison 26

West 71, Bartlett 65

Seward 63, Homer 19

North Pole 61, West Valley 25

Newhalen 78, Chief Ivan Blunka 40

Birchwood Christian 43, Nanwalek 28

Bethel 42, Nome-Beltz 35

Aniak 65, Tuluksak 50

Scammon Bay 49, St. Mary’s 38

Monroe Catholic 84, Galena 42

Ketchikan 57, Redington 24

Meade River 69, Alak 62

Fort Yukon 60, Jimmy Huntington 19

Grace Christian 50, Kenai Central 45

Shaktoolik 44, Shishmaref 34

Wrangell 44, Petersburg 31

Saturday

Unalakleet 41, Chevak 37

Meade River 54, Nunamiut 51

Monroe Catholic 68, Galena 32

Newhalen 32, Bristol Bay 26

Cook Inlet Academy 65, Birchwood Christian 32

Soldotna 55, Palmer 42

Nunamiut 48, Meade River 46

Boys

Sunday

SISD 51, Yakutat 18

Monday

Eagle River 54, Birchwood Christian 52

Colony 69, Grace Christian 64

Kenai Central 68, Nikiski 30

Tuesday

Susitna Valley 48, Lumen Christi 46

Dimond 54, Service 47

South 50, East 46

Houston 53, Redington 40

Wasilla 63, Mountain City Christian Academy 50

Kenai Central 74, Homer 47

Chugiak 66, Bartlett 45

Wednesday

SISD 59, Yakutat 17

Shishmaref 85, Savoonga 45

Hydaburg 58, Hoonah 51

Shaktoolik 103, Martin L Olson 49

Skagway 68, Gustavus 24

Davis-Romoth 108, Kobuk 31

Klawock 68, SISD 27

Glennallen 61, Nenana 57

Gambell 46, James C Isabell 31

South 63, Service 60

Seward 81, Houston 73

Bristol Bay 80, Chief Ivan Blunka 61

Mt. Edgecumbe 68, Sitka 59

Scammon Bay 79, Ignatius Beans 34

Brevig Mission 73, Aniguiin 67

Thursday

Savoonga 69, James C Isabell 61

Hoonah 64, Yakutat 45

Alak 88, Meade River 38

Shaktoolik 110, Brevig Mission 30

Chief Ivan Blunka 62, Tanalian 39

Nunamiut 66, Kali 48

Davis-Romoth 91, Buckland 45

Ninilchik 83, Lumen Christi 38

Monroe Catholic 43, North Pole 42

King Cove 57, Bristol Bay 41

Metlakatla 52, Haines 46

Nome-Beltz 62, Bethel 45

Skagway 79, Angoon 30

Birchwood Christian 69, Nanwalek 63

Dimond 60, Chugiak 57

Colony 75, Mountain City Christian Academy 49

Wasilla 66, Palmer 40

Klawock 63, Hydaburg 49

Shishmaref 58, Gambell 47

Grace Christian 63, Soldotna 52

Seward 66, Nikiski 51

Kenai Central 61, Houston 48

Nuiqsut Trapper 64, Alak 51

West Valley 51, Lathrop 44

Akiachak 83, Akiak 64

Scammon Bay 62, Marshall 54

Friday

Hoonah 71, SISD 38

Hydaburg 61, Kake 50

Chief Ivan Blunka 73, Bristol Bay 68

Kali 63, Meade River 45

Nunamiut 80, Nuiqsut Trapper 62

Service 58, East 50

Angoon 61, Hoonah 56

Cook Inlet Academy 73, Birchwood Christian 34

King Cove 75, Newhalen 39

Petersburg 53, Wrangell 20

Skagway 46, Klawock 43

Metlakatla 50, Haines 42

Nome-Beltz 71, Bethel 43

Juneau-Douglas 67, Tri-Valley 45

Wasilla 73, Chugiak 43

West 83, Bartlett 36

Colony 73, Kodiak 32

Delta 62, Valdez 54

West Valley 72, North Pole 46

Palmer 57, Soldotna 47

Nenana 55, Cordova 53

Chief Ivan Blunka 63, Manokotak 48

Scammon Bay 67, St. Mary’s 54

Unalakleet 87, Chevak 64

Shaktoolik 73, Shishmaref 54

Saturday

Unalakleet 95, Chevak 44

Cook Inlet Academy 95, Birchwood Christian 50

South 73, Eagle River 35

Palmer 45, Soldotna 40

• • •

College

Hockey

Friday

UAF 2, UAA 0

Saturday

UAA vs. UAF (Late)

• • •

Women’s basketball

Thursday

UAA 79, Western Oregon 58

Saint Martin’s 99, UAF 59

Saturday

Western Oregon 73, UAF 58

UAA vs. Saint Martin’s (Late)

• • •

Men’s basketball

Thursday

Saint Martin’s 77, UAF 65

UAA 80, Western Oregon 59

Saturday

UAF 82, Western Oregon 74

UAA vs. Saint Martin’s (Late)

• • •

NAHL

Friday

Anchorage Wolverines 5, Chippewa Steel 4

Saturday

Anchorage Wolverines vs. Chippewa Steel (Late)

• • •

2026 Fur Rondy Frostbite Footrace

5K Women

1. Courtney Spann, Anchorage, AK 26:05; 2. Racheal Kerr, Alakanuk, AK 26:07; 3. Anne-Marie Meyer, Yakima, WA 27:06; 4. Riann Anderson, Anchorage, AK 27:09; 5. Nevaeh Dunlap, Anchorage, AK 27:47; 6. Rita McKenzie, Anchorage, AK 27:55; 7. Marta Burke, Anchorage, AK 28:08; 8. Rachel Penney, Eagle River, AK 29:24; 9. Victoria Grant, Eagle River, AK 29:33; 10. Gretchen Klein, Craig, AK 29:36; 11. Penny Wasem, Willow, AK 29:42; 12. Chantel Van Tress, JBER, AK 29:51; 13. Janet Johnston, Anchorage, AK 30:18; 14. Dianna Clemetson, Anchorage, AK 31:33; 15. Sarah Hoepfner, Anchorage, AK 32:02; 16. Ireland Hicks, Seward, AK 33:21; 17. Lilly Schoonover, Seward, AK 33:21; 18. Suzanne Smerjac, Anchorage, AK 33:32; 19. Mindy Perdue, Wasilla, AK 34:12; 20. Oxana Bystrova, Anchorage, AK 34:23; 21. Charlene Canino, Anchorage, AK 34:49; 22. Tami Todd, Wasilla, AK 34:50; 23. Kaiena Tuiloma, Anchorage, AK 34:57; 24. Meg Kurtagh, Anchorage, AK 35:05; 25. Larue Groves, Chugiak, AK 35:13; 26. Rose Van Hemert, Anchorage, AK 36:12; 27. Morgan Daniels, Crestview, FL 36:25; 28. Elle Kauppi, Anchorage, AK 37:31; 29. Miranda Gibson, Wasilla, AK 37:46; 30. Caroline Secoy, JBER, AK 37:46; 31. Jordyn McNeil, Palmer, AK 38:29; 32. Ryan Plant, Palmer, AK 38:30; 33. Samantha Williams, Anchorage, AK 39:00; 34. Wendy Heck, Willow, AK 39:33; 35. Stephanie Kesler, Anchorage, AK 43:29; 36. Denise Wright, Anchorage, AK 43:50; 37. Brie Flores, Anchorage, AK 46:14; 38. Anabell Lewis, Anchorage, AK 46:15; 39. Jessica Lose, Anchorage, AK 46:18; 40. Kaylie Bylsma, Anchorage, AK 46:18; 41. Alicyn Giannakos, Anchorage, AK 46:38; 42. Natasha Henderson, Anchorage, AK 46:39; 43. Shannon Thompson, Anchorage, AK 48:40; 44. Heather Holcomb, Palmer, AK 48:40; 45. Debora Milligan, Iron Mountain, MI 57:36; 46. Rondy McKee, Puerto Vallarta, Jalisco, Mexico, 57:37

5K Men

1. James Miller, Anchorage, AK 18:28; 2. Barefoot Bogey, Woburn, MA 18:37; 3. Keaden Dunlap, Anchorage, AK 19:22; 4. Maximus Tagle-Martinez, JBER, AK 20:03; 5. Gavin Hanks, Eagle River, AK 20:59; 6. Patrick McAnally, Anchorage, AK 21:37; 7. Anthony Gomez, Anchorage, AK 22:37; 8. Christopher Hilliard, JBER, AK 23:20; 9. Terry Schimon, University Place, WA 23:37; 10. Ryan Moldenhauer, Anchorage, AK 24:12; 11. Matthew Haney, Anchorage, AK 24:24; 12. Dan Burke, Anchorage, AK 25:44; 13. Paul Chandanabhumma, Seattle, WA 25:52; 14. Woods Miller, Wasilla, AK 26:51; 15. Bill Grether, Anchorage, AK 27:10; 16. Charles Simmons, Anchorage, AK 27:15; 17. Jacob Cassianni, Anchorage, AK 27:32; 18. John Brewer, Anchorage, AK 28:09; 19. Dustin Whitcomb, Eagle River, AK 28:14; 20. Greg MacDonald, Anchorage, AK 28:28; 21. Kevin Redmond, Anchorage, AK 28:38; 22. Olin Jensen, Anchorage, AK 28:45; 23. Michael Loughlin, Anchorage, AK 29:18; 24. Daryl Schaffer, Anchorage, AK 30:30; 25. Aaron Paul, Anchorage, AK 30:37; 26. Mark Ireland, Anchorage, AK 30:37; 27. Christopher Pineda, Eagle River, AK 30:39; 28. Eric Jostsons, Anchorage, AK 31:07; 29. Justin Fitzgerald, Anchorage, AK 31:36; 30. Steve Lambert, Anchorage, AK 32:09; 31. Justin Atteberry, Anchorage, AK 32:21; 32. Matthew Beardsley, Anchorage, AK 34:07; 33. Caleb Penney, Eagle River, AK 34:21; 34. Evgenii Ivanov, Anchorage, AK 34:22; 35. Eliezer Rivera, Anchorage, AK 35:12; 36. David Massey, Anchorage, AK 35:38; 37. Zachary Todd, Wasilla, AK 35:39; 38. Ed Hills, Anchorage, AK 36:52; 39. Chucky Williams, Anchorage, AK 36:54; 40. Rick Taylor, Wasilla, AK 39:32; 41. Steven Shamburek, Anchorage, AK 43:48; 42. Dave Jones, Anchorage, AK 46:46; 43. Tom Meacham, Anchorage, AK 46:47; 44. Russell Martin, Ventura, CA 47:34; 45. David Martin, Ventura, CA 47:45; 46. Zachary Lounsberry, Palmer, AK 48:41

2.5K Women

1. Kelsey Kramer, Wilmington, NC 13:50; 2. Alannah Dunlap, Anchorage, AK 15:09; 3. Kelsea Johnson, Anchorage, AK 15:45; 4. Kirsten Kling, Anchorage, AK 16:05; 5. Miriam Hayes, Anchorage, AK 16:55; 6. Brianna Slayback, Anchorage, AK 17:04; 7. Haley Hoffman, Alexandria, VA 18:01; 8. Kathryn Hoke, Anchorage, AK 18:32; 9. Rachel Stein, Palmer, AK 18:51; 10. Shayla Harrison, Anchorage, AK 19:29; 11. Danielle Harrison, Anchorage, AK 19:30; 12. Nikki Withers, Tacoma, WA 19:32; 13. Michele Robuck, Anchorage, AK 20:20; 14. Jess Adams, Anchorage, AK 20:20; 15. Ashley Martinez, Miami, FL 20:24; 16. Laura Casanover, Houston, TX 20:31; 17. Adylaine Hacker, Eagle River, AK 21:59; 18. Mary Stutzman, Tallahassee, FL 22:59; 19. Jean Bielawski, Anchorage, AK 23:24; 20. Cheryl Parmelee, Mount Dora, FL 25:45; 21. Ruth Anderson, Anchorage, AK 26:56; 22. Morgan Withers, Tacoma, WA 27:17; 23. Terri Agee, Anchorage, AK 27:31; 24. Chyll Perry, Anchorage, AK 27:35; 25. Denice Withers, Yakima, WA 28:09; 26. Sarah Camacho, Anchorage, AK 28:20; 27. Katheryn Camacho, Anchorage, AK 28:21; 28. Brooke Whitcomb, Eagle River, AK 28:41; 29. Kristine Withers, Tacoma, WA 31:19; 30. Penny Helgeson, Anchorage, AK 33:56; 31. Kimberly Halstead, Eagle River, AK 34:02; 32. Julianna Halstead, Eagle River, AK 34:09

2.5K Men

1. Riley Howard, Anchorage, AK 10:54; 2. Julian Salao, Anchorage, AK 12:26; 3. Mitch Paisker, Anchorage, AK 16:05; 4. Kaden Bartholomew, Anchorage, AK 16:24; 5. Brandon Bartholomew, Anchorage, AK 16:25; 6. Michael Hayes, Anchorage, AK 16:30; 7. Calvin Stein, Anchorage, AK 18:51; 8. Jesse Ackerson, Anchorage, AK 19:42; 9. Clinton Hacker, Eagle River, AK 21:59; 10. Daniel Hjortstorp, Gakona, AK 22:20; 11. Atlas Hjortstorp, Gakona, AK 22:20; 12. Craig Withers, Tacoma, WA 27:18; 13. Jordan Ralph, Tacoma, WA 27:19; 14. Scott King, Anchorage, AK 28:20; 15. Shawn Withers, Yakima, WA 31:18; 16. John Ruthe, Anchorage, AK 35:53

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