Welcome to FIS   Sponsored By
Subscribe to FIS | Register with FIS | Advertise with FIS | Newsletter | About FIS | Contact us
   


Chinook salmon. (Photo: NOAA)

Chinook salmon from west coast have reduced their size in four decades

Click on the flag for more information about United States UNITED STATES
Wednesday, February 28, 2018, 22:50 (GMT + 9)

A new study by the University of Washington reveals that the largest and oldest chinook salmon have mostly disappeared along the West Coast.

Researchers analyzed around 40 years of data from hatchery and wild chinook populations from California to Alaska, looking at patterns that emerged over the course of four decades and across thousands of miles of coastline.

In general, they found that chinook salmon populations from Alaska showed the biggest reductions in age and size, while salmon from Washingtin were in second place.

“Chinook are known for being the largest Pacific salmon and they are highly valued because they are so large,” said lead author Jan Ohlberger, a research scientist in the UW’s School of Aquatic and Fishery Sciences. “The largest fish are disappearing, and that affects subsistence and recreational fisheries that target these individuals,” he added.

Chinook salmon are born in freshwater rivers and streams, then migrate to the ocean where they spend most of their lives feeding and growing to their spectacular body size. Each population’s lifestyle in the ocean varies, mainly depending on where they can find food.

California Chinook salmon tend to stay in the marine waters off the coast, while Oregon and Washington fish often migrate thousands of miles northward along the west coast to the Gulf of Alaska where they feed. Western Alaska populations tend to travel to the Bering Sea.

After one to five years in the ocean, the fish return to their home streams, where they spawn and then die.

According to the study, most populations analyzed showed a reduction in the average size of the returning fish over the last four decades,  up to 10 percent shorter in length, in the most extreme cases.

Researchers said these similarities, despite the different life histories of the different populations, point to a cause that transcends regional fishing practices, ecosystems, or animal behaviors.

“This suggests that there is something about the larger ocean environment that is driving these patterns,” Ohlberger said. “I think fishing is part of the story, but it’s definitely not sufficient to explain all of the patterns we see. Many populations are exploited at lower rates than they were 20 to 30 years ago.”

The reductions in size could have a long-term impact on the abundance of Chinook salmon, because smaller females carry fewer eggs, so over time the number of fish that hatch and survive to adulthood may decrease.

Researchers also revealed that resident killer whales and other marine mammals that feed on salmon are probably contributing to these changes.

Scientists are still trying to understand the impacts of orcas and other marine mammals on Chinook salmon, and the ways in which their relationships may have ebbed and flowed in the past. It may not be possible, for example, for marine mammals and Chinook salmon populations to be robust at the same time, given their predator-prey relationship.

This new study was funded by the Pacific State Marine Fisheries Commission, and published in Fish and Fisheries magazine.


www.fis.com

Photo Courtesy of FIS Member  National Oceanic and Atmospheric Administration NOAA/NMFS
 Print


Click to know how to advertise in FIS
MORE NEWS
United States
Mar 2, 21:00 (GMT + 9):
Australis First in World to Achieve Tropical Marine Finfish ASC Certification
United States
Mar 2, 19:00 (GMT + 9):
Alaska pollock catches in season A (DAP in NMFS count) | week 7
United States
Mar 2, 18:00 (GMT + 9):
‘We will very likely find it’: Microplastics warning sounded for aquafeeds
Sweden
Mar 2, 17:00 (GMT + 9):
Accidental discovery could save supermarkets huge amounts of electricity
Switzerland
Mar 2, 08:00 (GMT + 9):
In 1st Day on Job, New WTO Chief Pushes for Fisheries Deal
Republic of Ireland
Mar 2, 08:00 (GMT + 9):
IN BRIEF - Irish Navy detains Belgian fishing boat off southwest coast
United Kingdom
Mar 2, 08:00 (GMT + 9):
While the European Mollusc Market Struggles with the Pandemic, Brexit Emerges Another Serious Threat to the UK’s Producers
United States
Mar 2, 08:00 (GMT + 9):
Aquarium scientists urge more aggressive measures to reduce entanglement risk for North Atlantic right whales
United States
Mar 2, 07:00 (GMT + 9):
Updated BAP Farm Standard Includes New Requirements on Antimicrobials, Social Accountability, Wildlife Protection
Spain
Mar 2, 07:00 (GMT + 9):
The Spanish tuna fleet perplexed by the intention to assign yellowfin quotas to fleets that use prohibited gear in the Indian Ocean
United States
Mar 2, 06:50 (GMT + 9):
Weekly production of Alaskan pollock roe (DAP in BSAI/GOA) | week 7
Japan
Mar 2, 06:50 (GMT + 9):
Volumes and Prices │ Pollock roes (Tarako & Mentaiko)│ Tokyo Central Fish Market │ January 2021
Norway
Mar 2, 00:00 (GMT + 9):
Other Media | SalmonBusiness: Land-based salmon farmer Proximar Seafood signs €46 million construction contract with Japan’s largest homebuilder
France
Mar 2, 00:00 (GMT + 9):
Other Media | FiskerForum: Demonising A Whole Industry
Belgium
Mar 2, 00:00 (GMT + 9):
Other Media | Industrias Pesqueras: Brussels activates a public consultation on the future supply and food safety plan in times of crisis



Lenguaje
FEATURED EVENTS
  
TOP STORIES
As of February 24, Russian fishermen captured more than 681 thousand tons
Russia Fed. According to the sectoral monitoring system, the total volume of extraction (capture) of aquatic biological resources by all Russian users as of February 24, 2021 amounted to 681.1 thousand tons, whic...
ISSF Report: 16 Tuna Stocks Not Meeting Criteria for Marine Stewardship Council (MSC) Sustainability Standard
United States Now including bluefin tuna stocks, report reveals that seven stocks achieve passing score on MSC Principle 1, and most tuna RFMOs score well on MSC Principle 3 Independent fisheries scientists in A...
In 1st Day on Job, New WTO Chief Pushes for Fisheries Deal
Switzerland GENEVA - The new head of the World Trade Organization threw her support behind long-fruitless efforts among member countries to agree on fisheries subsidies that could reduce overfishing, calling the ...
Future-oriented HI fleet: New vessels with and without crew strengthen maritime surveillance
Norway Five completely new vessels, four of which are self-propelled, will be an important part of the Institute of Marine Research's long-term cruise strategy. Now it is clear who will be responsible fo...
 
Maruha Nichiro Corporation
Nichirei Corporation - Headquarters
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation - Wartsila Group Headquarters
ITOCHU Corporation - Headquarters
BAADER - Nordischer Maschinenbau Rud. Baader GmbH+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Sea Harvest Corporation (PTY) Ltd. - Group Headquarters
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
AquaChile S.A. - Group Headquarters
Pesquera San Jose S.A.
Nutreco N.V. - Head Office
CNFC China National Fisheries Corporation - Group Headquarters
W. van der Zwan & Zn. B.V.
SMMI - Sunderland Marine Mutual Insurance Co., Ltd. - Headquarters
Icicle Seafoods, Inc
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel - Group Headquarters
SalMar ASA - Group Headquarters
Sajo Industries Co., Ltd
Hansung Enterprise Co.,Ltd.
BIM - Irish Sea Fisheries Board (An Bord Iascaigh Mhara)
CEFAS - Centre for Environment, Fisheries & Aquaculture Science
COPEINCA ASA - Corporacion Pesquera Inca S.A.C.
Chun Cheng Fishery Enterprise Pte Ltd.
VASEP - Vietnam Association of Seafood Exporters & Producers
Gomes da Costa
Furuno Electric Co., Ltd. (Headquarters)
NISSUI - Nippon Suisan Kaisha, Ltd. - Group Headquarters
FAO - Food and Agriculture Organization - Fisheries and Aquaculture Department (Headquarter)
Hagoromo Foods Co., Ltd.
Koden Electronics Co., Ltd. (Headquarters)
A.P. Møller - Maersk A/S - Headquarters
BVQI - Bureau Veritas Quality International (Head Office)
UPS - United Parcel Service, Inc. - Headquarters
Brim ehf (formerly HB Grandi Ltd) - Headquarters
Hamburg Süd Group - (Headquearters)
Armadora Pereira S.A. - Group Headquarters
NOAA - National Oceanic and Atmospheric Administration (Headquarters)
Mowi ASA (formerly Marine Harvest ASA) - Headquarters
Marubeni Europe Plc -UK-
Findus Ltd
Icom Inc. (Headquarter)
WWF Centroamerica
Oceana Group Limited
The David and Lucile Packard Foundation
Ajinomoto Co., Inc. - Headquarters
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
CJ Corporation  - Group Headquarters
Greenpeace International - The Netherlands | Headquarters
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
NOREBO Group (former Ocean Trawlers Group)
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation - Headquarters
Cooke Inc. - Group Headquarters
AKBM - Aker BioMarine ASA
Seafood Choices Alliance -Headquarter-
Austevoll Seafood ASA
Walmart | Wal-Mart Stores, Inc. (Supermarket) - Headquarters
New Japan Radio Co.Ltd (JRC) -Head Office-
Gulfstream JSC
Marine Stewardship Council - MSC Worldwide Headquarters
Royal Dutch Shell plc (Headquarter)
Genki Sushi Co.,Ltd -Headquarter-
Iceland Pelagic ehf
AXA Assistance Argentina S.A.
Caterpillar Inc. - Headquarters
Tiger Brands Limited
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2021 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER