Navigation Links
Salmon smolt survival similar in Columbia and Fraser rivers
Date:10/28/2008

CORVALLIS, Ore. A new study by researchers in Oregon and British Columbia has found that survival of juvenile salmon and steelhead during their migration to the sea through two large Northwest rivers the Columbia and the Fraser is remarkably similar despite one major difference.

The Columbia River has a series of dams, while the Fraser has none. However, the researchers point out, there clearly are other differences between the rivers. And though the study using both acoustic and transponder tags found that the average mortality in both rivers was between 70 and 80 percent over a four-year period, the results should be viewed with caution.

Findings of the study were published this week in the journal PLoS Biology.

"Despite the obvious comparison, it would be overly simplistic to say that dams have no impact on smolt survival, because we know they do," cautioned Carl Schreck, a professor of fisheries and wildlife at Oregon State University and the U.S. Geological Survey and an author of the study. "There also may be some additional delayed mortality of Columbia River smolts caused by the stress of passage through the hydrosystem that is not manifested until the fish reach the ocean."

Columbia River juvenile salmon can be stressed by navigating the series of dams from Lower Granite to Bonneville. Other stress-inducers can include water temperature, contaminants, predation attempts, and availability of food, forcing fish to channel their energy into survival instead of growth, Schreck pointed out.

"Stress in fish delays development," he said. "It also suppresses the immune system, which can increase the chance that fish will be susceptible to disease or parasites. Even though these data suggest that the fish survive the freshwater phase of their migration, that kind of weakened condition can be the difference when a young salmon tries to adapt to a salt water environment."

Schreck, a leading expert o
'/>"/>

Contact: Carl Schreck
carl.schreck@oregonstate.edu
541-737-1961
Oregon State University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Scientists achieve first tracking of salmon from headwaters in Rockies through Pacific to Alaska
2. Research challenges conventional notions about salmon survival
3. Similar survival rates for Pacific salmon in Fraser, Columbia Rivers raises new questions
4. Wolves would rather eat salmon
5. ETH Zurich study on salmonella self-destruction
6. Signals from the Atlantic salmon highway
7. Sesame seed extract and konjac gum may help ward off Salmonella and E. coli
8. From foe to friend: Researchers use salmonella as a way to administer vaccines in the body
9. Fruit flies show how salmonella escapes immune defenses
10. Hatchery fish outnumber wild chinook salmon in troubled fall run
11. Unfavorable ocean conditions likely cause of low 2007 salmon returns along West Coast
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/1/2014)... CAAugust 1, 2014Biologists at The Scripps Research Institute (TSRI) ... powerful calorie-burning process in brown fat cells. , ... Early Edition of the Proceedings of the National ... known as "brown fat thermogenesis," which is of great ... loss and may also protect against diabetes. , "This ...
(Date:8/1/2014)...  LiveScan Service Provider Binary Biometrics is pleased to welcome ... Biometrics will improve its mobile service capabilities and add more daily appointments, which ... and service several new cities such as, but not limited to, ... , Deltona , Edgewater , ... Smyrna Beach , Oak Hill , Orange ...
(Date:7/31/2014)... production from shale rock has increased by more ... do not fully understand the industry,s effects on ... the journal Frontiers in Ecology and the ... vastly outpace scientific examination, a team of eight ... Princeton University, concluded that determining the environmental impact ...
Breaking Biology News(10 mins):Scripps Research Institute scientists find new calorie-burning switch in brown fat 2Scripps Research Institute scientists find new calorie-burning switch in brown fat 3Binary Biometrics, Founded by James Timothy White, Expands Services to 13+ Locations With the Addition of Owner/Operator Kevin Morris 2Binary Biometrics, Founded by James Timothy White, Expands Services to 13+ Locations With the Addition of Owner/Operator Kevin Morris 3'Fracking' in the dark: Biological fallout of shale-gas production still largely unknown 2'Fracking' in the dark: Biological fallout of shale-gas production still largely unknown 3
... historical water conditions. By synthesizing present-day data with ... trends on a regional basis for periods from which scant ... impede hydrologists, understanding of the current state of waterways and ... was the case for the rivers of the northeastern United ...
... to measure the structure of membrane proteins despite being damaged ... help fast track the development of targeted drugs using emerging ... today depend on the activity of membrane proteins, which are ... our body. A major problem for the design of ...
... crow, a forest crow living on Rota Island in the ... The extinction could happen almost twice as soon as previously ... bird management program that focuses on helping fledgling birds reach ... in psychology. Ha examined survival rates in 97 Mariana ...
Cached Biology News:CCNY-led interdisciplinary team recreates colonial hydrology 2CCNY-led interdisciplinary team recreates colonial hydrology 3Despite damage, membrane protein structure can be seen using new X-ray technology, study reveals 2Without intervention, Mariana crow to become extinct in 75 years 2
(Date:7/31/2014)... reason people over 60 are not donor candidates for ... with time, making the elderly prone to life-threatening infection ... team now has discovered a reason why. , "We ... of blood-forming cells to maintain blood production over time ... that could be restored for rejuvenation therapies," said Emmanuelle ...
(Date:7/31/2014)... Hopkins have mapped the sound-processing part of the mouse ... forest and the trees in view. Their imaging technique ... activity within mice, and it enabled the team to ... each other. The results, which represent a step toward ... online July 31 the journal Neuron . , ...
(Date:7/31/2014)... , July 31, 2014 According ... Research "Quantum Dots Market - Global Industry Analysis, Size, ... market was valued at USD 88.5 million in 2011, ... 2023, growing at a CAGR of 53.8% from 2013 ... Market Report at  http://www.transparencymarketresearch.com/quantum-dots.html Increasing demand ...
(Date:7/31/2014)... (PRWEB) July 31, 2014 North Shore Towers, ... City, partnered with GI Energy, one of the nation’s leading ... $13 million upgrade of its 43-year-old CHP system. The original ... in an effort to extend the life of the plant, ... and associated electrical and heat recovery equipment, while maintaining continuous ...
Breaking Biology Technology:Key to aging immune system is discovered 2New mapping approach lets scientists zoom in and out as the brain processes sound 2Global Quantum Dots Market is Expected to Reach USD 8,246.8 Million in 2023: Transparency Market Research 2Global Quantum Dots Market is Expected to Reach USD 8,246.8 Million in 2023: Transparency Market Research 3Global Quantum Dots Market is Expected to Reach USD 8,246.8 Million in 2023: Transparency Market Research 4North Shore Towers Partners with GI Energy to Install Turnkey Natural Gas-Fired Combined Heat and Power Plant 2
... Inc. (Amex:,SGN) has received its second Frost & Sullivan ... 2008, at the Frost & Sullivan Awards Banquet,Signalife was ... American Patient Monitoring. Signalife,s Chief Executive Officer, Dr.,Lowell Harmison, ... present to accept the award., Signalife, Inc. is ...
... result in longer-lasting, safer batteries for ... cars, ... Department of Energy,s,(DOE) Argonne National Laboratory and Toda Kogyo Corp. ... commercial production and,sales of Argonne,s patented composite cathode materials for ...
... March 13 Arpida Ltd,(SWX: ARPN) announced today its ... 2007 highlights, Major pipeline progress:, - Second ... its pre-specified primary endpoint, as did the first, ... iclaprim in,cSSSI initiated, - First patients enrolled in ...
Cached Biology Technology:Signalife Wins Second Frost & Sullivan Technology Award 2Signalife Wins Second Frost & Sullivan Technology Award 3Argonne's Lithium-Ion Battery Technology to be Commercialized by Japan's Toda Kogyo 2Argonne's Lithium-Ion Battery Technology to be Commercialized by Japan's Toda Kogyo 3Arpida Announces Full Year 2007 Financial Results 2Arpida Announces Full Year 2007 Financial Results 3Arpida Announces Full Year 2007 Financial Results 4Arpida Announces Full Year 2007 Financial Results 5Arpida Announces Full Year 2007 Financial Results 6Arpida Announces Full Year 2007 Financial Results 7Arpida Announces Full Year 2007 Financial Results 8Arpida Announces Full Year 2007 Financial Results 9