Navigation Links
Salmonid hatcheries cause 'stunning' loss of reproduction
Date:10/4/2007

tedly bred in hatcheries they tended to be more docile, adapted well to surface feeding, and they thrived and survived at an 85-95 percent level in the safe hatchery environment.

More recently, some supplementation hatchery operations have moved to the use of wild fish for their brood stock, on the theory that their offspring would retain more ability to survive and reproduce in the wild, and perhaps help rebuild threatened populations.

What happens to wild populations when they interbreed with hatchery fish still remains an open question, Blouin said. But there is good reason to be worried.

Earlier work by researchers from OSU and the Oregon Department of Fish and Wildlife had suggested that first-generation hatchery fish from wild brood stock probably were not a concern, and indeed could provide a short-term boost to a wild population. But the newest findings call even that conclusion into question, he said.

The problem is in the second and subsequent generations, Blouin said. There is now no question that using fish of hatchery ancestry to produce more hatchery fish quickly results in stocks that perform poorly in nature.

Evolution can rapidly select for fish of certain types, experts say, because of the huge numbers of eggs and smolts produced and the relatively few fish that survive to adulthood. About 10,000 eggs can eventually turn into fewer than 100 adults, Blouin said, and these are genetically selected for whatever characteristics favored their survival. Offspring that inherit traits favored in hatchery fish can be at a serious disadvantage in the wild where they face risks such as an uncertain food supply and many predators eager to eat them.

Because of the intense pressures of natural selection, Blouin said, salmon and steelhead populations would probably quickly revert to their natural state once hatchery fish were removed.

However, just removing hatchery fish may not ensure the survival
'/>"/>

Contact: Michael Blouin
blouinm@science.oregonstate.edu
541-737-2362
Oregon State University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Dysentery uses sword and shield to cause infection
2. Scientists detect probable genetic cause of some Parkinsons disease cases
3. BRCA1 causes ovarian cancer through indirect, biochemical route
4. Scientists decipher genome of fungus that can cause life-threatening infections
5. Researchers discover molecule that causes secondary stroke
6. UF Researchers Map Bacterial Proteins That Cause Tooth Loss
7. Molecule that usually protects infection-fighting cells may cause plaque deposits inside arteries
8. NASA study finds snow melt causes large ocean plant blooms
9. New Estimates For The Causes Of Child Deaths Worldwide
10. Emergence of cancer as major cause of childhood death in developing countries is not being adequately addressed
11. UNC launches study of liver injury caused by drugs
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/12/2015)... 12, 2015  New research unveiled at Black ... phones to steal users, fingerprints. Information released today ... fingerprint scanners on mobile devices, making the security ... biometrics on mobile devices, HYPR Corp. recently released ... authentication systems with strong cryptographic security. More information ...
(Date:8/10/2015)... 2015 The latest 364 page report ... of the global border security market . Visiongain ... in 2015. Now: Border security is hard to ... the business critical issue you need to know about - ... objective analysis of how this will impact your company and ...
(Date:8/5/2015)... According to a new market ... Services, Vertical (BFSI, Airport, IT & Telecom, Utilities, Education, ... to 2020", published by MarketsandMarkets, defines and segments the ... segments. The global PIAM Market is estimated to grow ... 2019, at a CAGR of 14.9 % from 2014 ...
Breaking Biology News(10 mins):HYPR Corp. Addresses Android Vulnerability That Exposes Ecosystem-wide Biometric Security Challenges 2HYPR Corp. Addresses Android Vulnerability That Exposes Ecosystem-wide Biometric Security Challenges 3Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 2Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 3Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 4Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 5Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 6Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 7Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 8Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 9Physical Identity and Access Management Market Worth $546.2 Million by 2019 2Physical Identity and Access Management Market Worth $546.2 Million by 2019 3Physical Identity and Access Management Market Worth $546.2 Million by 2019 4
... protein regulates secretion levels in the fruit fly's salivary ... the May 15 issue of Development, the finding improves ... is a critical ability of certain glands and cell ... researchers discovered that a protein called CrebA single-handedly controls ...
... skin cancer, researchers at the Huntsman Cancer Institute at the ... gene found in up to 30 percent of human tumors. ... in cell signaling, or communication among cells. When mutated, however, ... shown to promote the growth of cancers in the pancreas, ...
... gene therapy can promote the growth of new "insulation" around ... new study shows. The treatment, which mimics the activity of ... and electrical conduction from the brain to the leg muscles. ... spinal cord injury in humans. The study was funded in ...
Cached Biology News:Study: Well-known protein helps stem cells become secretory cells 2Scientists inhibit cancer gene 2Combination therapy leads to partial recovery from spinal cord injury in rats 2Combination therapy leads to partial recovery from spinal cord injury in rats 3
(Date:8/28/2015)... Research and Markets ( ... "Global & USA BioSimilar Market Analysis to 2021" ... US Biosimilar market will be initiated in September as ... will the global market react? Will biosimilars explode into ... save the US economy up to $250 billion within ...
(Date:8/28/2015)... 2015 /PRNewswire/ - RepliCel Life Sciences Inc. (OTCQB: ... focused on the development of autologous cell therapies, ... June 30, 2015, corporate highlights, and near-term milestones.  ... available at www.sedar.com ,  www.edgar.com ... "RepliCel expects to launch its RCS-01 treatment for ...
(Date:8/27/2015)... ... , ... Capital Edge Consulting , a nationwide consulting firm that specializes ... ranking as one of the top 5000 companies listed on the 2015 Inc. ... , “It is truly an honor to be recognized as one of America’s fastest ...
(Date:8/27/2015)... , Aug. 27, 2015  Asterias Biotherapeutics, Inc. (NYSE ... field of regenerative medicine, today announced that executives from ... the month of September.  , ... Rodman & Renshaw,s 17th Annual Global Investment Conference on ... the St. Regis Hotel in New York ...
Breaking Biology Technology:Global & USA BioSimilar Market Analysis Report 2015-2021 2Global & USA BioSimilar Market Analysis Report 2015-2021 3RepliCel Reports Second Quarter 2015 Financial Results 2RepliCel Reports Second Quarter 2015 Financial Results 3RepliCel Reports Second Quarter 2015 Financial Results 4RepliCel Reports Second Quarter 2015 Financial Results 5Capital Edge Consulting Makes Inc. 5000 List of America’s Fastest-Growing Private Companies 2Capital Edge Consulting Makes Inc. 5000 List of America’s Fastest-Growing Private Companies 3Asterias Biotherapeutics to Present at Upcoming Investor Conferences 2
... Pharmos Corporation,(Nasdaq: PARS ) today reported results for the ... loss of $2.7 million, or $0.10 per share,for the second ... or,$0.18 per share, in the second quarter 2007. Cash and ... decrease in net loss for the second quarter 2008 is ...
... Aug. 7 Anesiva,Inc. (Nasdaq: ANSV ) today ... six months ended June 30, 2008., "The 2008 ... we,introduced Zingo(TM) in the U.S. pediatric hospital market," said ... I,m pleased,to report that our Phase 3 trials of ...
... announced that it,has extended its current offer to purchase ... Purchase Warrants, Class 1 and Class B Common Stock,Purchase ... time, on,Friday, August 15, 2008. The offer was scheduled ... August 7, 2008., The extension will provide Warrant ...
Cached Biology Technology:Pharmos Corporation Reports 2008 Second Quarter Results 2Pharmos Corporation Reports 2008 Second Quarter Results 3Pharmos Corporation Reports 2008 Second Quarter Results 4Pharmos Corporation Reports 2008 Second Quarter Results 5Anesiva Announces Second Quarter 2008 Financial Results and Update 2Anesiva Announces Second Quarter 2008 Financial Results and Update 3Anesiva Announces Second Quarter 2008 Financial Results and Update 4Anesiva Announces Second Quarter 2008 Financial Results and Update 5Anesiva Announces Second Quarter 2008 Financial Results and Update 6Anesiva Announces Second Quarter 2008 Financial Results and Update 7Anesiva Announces Second Quarter 2008 Financial Results and Update 8
...
2ndGen Predilute antibody for staining tissue sections. Optimized for use with Zymeds Histostain-PLUS, NBA, HistoST5050, and Cap-Plus IHC Kits.Labeling: ASR...
... degradation of single-stranded DNA and RNA endonucleolytically ... nuclease prefers ssDNA over dsDNA by 30,000-fold, ... double-stranded DNA from both ends (1,2). Mung ... mapping studies (3,4), for flushing staggered ends ...
Endomorphin-2. Cross reactivity: Endomorphin-1 3%, Met-enkephalin <0.03%, Leu-enkephalin <0.01% and beta-Endorphin <0.01%....
Biology Products: