Navigation Links
Unfavorable ocean conditions likely cause of low 2007 salmon returns along West Coast
Date:3/3/2008

NOAA scientists are reviewing unusual environmental conditions in the Pacific Ocean as the likely culprit for the dramatically low returns of Chinook and coho salmon to rivers and streams along the West Coast of the United States in 2007.

Researchers from NOAAs Northwest and Southwest Fisheries Science Centers are comparing data on the low food production of the California Current in 2005 that occurred when this years returning salmon would have been entering the ocean from their natal streams to feed and grow.

The cold waters of the California Current flow southward from the northern Pacific along the West Coast and are associated with upwelling, an ocean condition caused by winds that bring nutrients to the oceans surface and is the main source of nourishment for the oceans food web. In 2005 a southward shift in the jet stream, delayed favorable winds and upwelling for the California Current, which normally begins in spring. The winds instead arrived in mid-July, causing high surface water temperatures and very low nutrient production within the nearshore marine ecosystem.

We are not dismissing other potential causes for this years low salmon returns, said Usha Varanasi, NOAA Fisheries Service Science Center Director for the Northwest Region. But the widespread pattern of low returns along the West Coast for two species of salmon indicates an environmental anomaly occurred in the California Current in 2005.

Data released Thursday by the Pacific Fisheries Management Council indicate the 2007 returns of fall Chinook salmon to the Sacramento River in Californias Central Valley were approximately 33 percent of what fishery biologists expected. Projections for 2008 are substantially lower than last years estimate. [http://www.pcouncil.org/newsreleases/Feb_2008_Sacramento_News_Release.pdf]

Coho salmon returning to spawning streams in California and Oregon are also considerably lower than predicted. A preliminary analysis found an average 27 percent of the parental stock returning in 12 streams monitored in California. Even though coho returns appear to improve along the coast from south to north, Oregon Coast coho salmon had less than 30 percent of their parental stock return.

Coho salmon are listed as either endangered or threatened under the Endangered Species Act in the Central/Northern California and Southern Oregon watersheds.


'/>"/>

Contact: Jim Milbury
jim.milbury@noaa.gov
562-980-4006
NOAA National Marine Fisheries Service
Source:Eurekalert

Related biology news :

1. 2008 Ocean Sciences Meeting -- media advisory 2
2. Voyage to Southern Ocean aims to study air-sea fluxes of greenhouse gases
3. Climate change has major impact on oceans
4. Oceans fiercest predators now vulnerable to extinction
5. Valuing ocean services in the Gulf of Maine -- New approaches for conflict resolution
6. Map is first to track global human influences on ocean ecosystems
7. First map of threats to marine ecosystems shows all the worlds oceans are affected
8. Worlds largest marine protected area created in Pacific Ocean
9. Scientists expand understanding of how river carbon impacts the Arctic Ocean
10. Coral reefs may be protected by natural ocean thermostat
11. Antarctic expedition provides new insights into the role of the Southern Ocean for global climate
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/26/2017)... 26, 2017  Acuity Market Intelligence today released ... Digital Identity".  Acuity characterizes 2017 as a "breakout" ... adoption reflects a new understanding of the potential ... and digital identity are often perceived as threats ... , Principal of Acuity Market intelligence. "However, taken ...
(Date:1/24/2017)... 2017  It sounds simple and harmless—an electronic ... vital signs and alerts parents on their smart ... level drops. But pediatric experts argue that such ... no evidence of medical benefits, especially to healthy ... to parents of healthy babies, promising peace of ...
(Date:1/19/2017)... India , January 19, 2017 According to a ... Opportunities and Forecast, 2014 - 2022," the global biometric sensor market is expected ... 2016 to 2022. In 2015, Asia-Pacific dominated the global ... and private sectors. Continue Reading ... ...
Breaking Biology News(10 mins):
(Date:2/24/2017)... -- China Biologic Products, Inc. (NASDAQ: CBPO) ("China Biologic" or ... China, today announced its financial results for the fourth quarter ... 2016 Financial Highlights Total sales in ... terms, or increased by 13.6% in USD terms to $77.6 ... Gross profit increased by 13.3% to $46.8 ...
(Date:2/23/2017)... , ... February 23, 2017 , ... ... Discovery Services portfolio to include an array of biochemical analyses critical for ... data to drive their hit-to-lead and SAR programs, including inhibitor potency and selectivity, ...
(Date:2/23/2017)... 2017  Imanis Life Sciences announced today the ... vaccinia viruses for virotherapy research. These viruses are ... proprietary, vaccinia virus-based technology platform for research use. ... a partnership with Genelux to offer researchers, for ... use in research," said Dr. Kah Whye ...
(Date:2/23/2017)... ... , ... The Greater Gift Initiative, Inc , (GGI) a Winston-Salem, NC ... GGI's mission is to advance global health and highlight the greater good of clinical ... each clinical trial volunteer. The vision of GGI is to serve as a philanthropic ...
Breaking Biology Technology: