Navigation Links
Hatchery fish may hurt efforts to sustain wild salmon runs
Date:6/10/2009

ry salmonids many of which do survive to reproduce in the wild could be gradually reducing the fitness of the wild populations with which they interbreed. Those hatchery fish provide one more hurdle to overcome in the goal of sustaining wild runs, along with problems caused by dams, loss or degradation of habitat, pollution, overfishing and other causes.

Aside from weakening the wild gene pool, the release of captive-bred fish also raises the risk of introducing diseases and increasing competition for limited resources, the report noted.

This research, which was just published in Biology Letters, was supported by grants from the Bonneville Power Administration and the Oregon Department of Fish and Wildlife. It was based on years of genetic analysis of thousands of steelhead trout in Oregon's Hood River, in field work dating back to 1991. Scientists have been able to genetically "fingerprint" three generations of returning fish to determine who their parents were, and whether or not they were wild or hatchery fish.

The underlying problem, experts say, is Darwinian natural selection.

Fish that do well in the safe, quiet world of the hatcheries are selected to be different than those that do well in a much more hostile and predatory real-world environment. Using wild fish as brood stock each year should lessen the problem, but it was just that type of hatchery fish that were used in the Hood River study. This demonstrates that even a single generation of hatchery culture can still have strong effects.

Although this study was done with steelhead trout, it would be reasonable to extrapolate its results to other salmonids, researchers said. It's less clear what the findings mean to the many other species that are now being bred in captivity in efforts to help wild populations recover, Blouin said, but it's possible that similar effects could be found.

Captive breeding is now a cornerstone of recovery efforts by
'/>"/>

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

Page: 1 2 3

Related biology news :

1. Hatchery fish outnumber wild chinook salmon in troubled fall run
2. Study may aid efforts to prevent uncontrolled cell division in cancer
3. Endangered sawfish focus of national collection and recovery efforts
4. Corporate Safe Specialists Launches International Sales Efforts
5. Recovery efforts not enough for critically endangered Asian vulture
6. Scientists to assess Beijing Olympics air pollution control efforts
7. Scripps scientists will assess Beijing Olympics air pollution control efforts
8. Extended cyclone relief efforts aided from space
9. Protein protects lung cancer cells from efforts to fix or kill them
10. DOE JGI releases soybean genome assembly to enable worldwide bioenergy research efforts
11. Great Ape Trust awards $127,000 for international conservation efforts
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/20/2014)... WORCESTER, MA Using population-based screening outcomes of approximately ... states, including four researchers at the University of Massachusetts ... combined immunodeficiency (SCID) can be successfully implemented across public ... programs published in the Aug. 20 issue of the ... JAMA ) showed the rate of SCID in newborns ...
(Date:8/20/2014)... are athletes who have suffered concussions ready to return ... found that high school athletes who head back on ... a significant regression in their abilities to simultaneously walk ... seen in changes in their balance and/or altered walking ... of the 12 had returned to activity in less ...
(Date:8/20/2014)... plastic bags could one day be made out of ... are now reporting. The novel process they developed and ... its agricultural and plastic waste problems, appear in the ... S. Bayer and colleagues at the Italian Institute of ... In 2012, its production reached 288 million tons worldwide, ...
Breaking Biology News(10 mins):Newborn screening expansion offers early diagnosis and treatment to infants with SCID 2Newborn screening expansion offers early diagnosis and treatment to infants with SCID 3Recovery reversal seen in Oregon study of returning concussed athletes 2Recovery reversal seen in Oregon study of returning concussed athletes 3
... be processed unconsciously when the area of the brain ... down, according to research at Rice University in Houston. ... in the Proceedings of the National Academy of Sciences' ... than one pathway along which visual information can be ...
... have identified some of the key factors that prevent ... (MS), complications of premature birth, and other diseases and ... nervous system fails to repair itself and suggest ways ... be reversed. The research is published in the August ...
... an alien if you encountered it on the street tomorrow? ... rather was created in a laboratory right here on Earth ... Peter Ward has the beginnings of an answer. In a ... expanded "tree of life," or biological classification system, to account ...
Cached Biology News:Out of sight, out of mind? Not necessarily 2OHSU researchers discover potential mechanism to repair brain damage linked to Multiple Sclerosis 2OHSU researchers discover potential mechanism to repair brain damage linked to Multiple Sclerosis 3OHSU researchers discover potential mechanism to repair brain damage linked to Multiple Sclerosis 4New book expands biological classifications to account for 'alien' life 2New book expands biological classifications to account for 'alien' life 3
(Date:8/20/2014)... Aug. 20, 2014 /PRNewswire-iReach/ -- A case study ... between the school,s bioengineering department and the Intel® ... Intel® Software Academic Program, UCSD,s research focuses on ... human body.  Photo - ... the work of Dr. Todd P. Coleman ...
(Date:8/20/2014)... GraphDB™ 6.0 from ... to the enterprise replication cluster, faster loading speeds, ... and Elasticsearch. This release happens to coincide with ... – GraphDB™ was formerly known as OWLIM. ... mature enterprise resilient RDF triplestore will also benefit ...
(Date:8/19/2014)... -- Research and Markets  has announced the addition of the ... report to their offering. This report analyzes ... Thousands by the following Product Segments: Media, Sera, and Reagents. ... Canada , Japan , ... Latin America . Annual estimates and forecasts are provided for ...
(Date:8/19/2014)... 2014 Research and Markets  has announced the ... Global Strategic Business Report" report to their offering. ... Oxide Fuel Cells (SOFCs) in US$ Thousands. The report provides ... , Europe , Asia-Pacific ... provided for the period 2012 through 2020. Market data and ...
Breaking Biology Technology:Intel and University of San Diego Bioengineering Department Release Case Study on Health Sciences Research 2Ontotext Improves Its RDF Triplestore, GraphDB™ 6.0: Enterprise Resilience, Faster Loading Speeds and Connectors to Full-Text Search Engines Top the List of Enhancements 2Ontotext Improves Its RDF Triplestore, GraphDB™ 6.0: Enterprise Resilience, Faster Loading Speeds and Connectors to Full-Text Search Engines Top the List of Enhancements 3Ontotext Improves Its RDF Triplestore, GraphDB™ 6.0: Enterprise Resilience, Faster Loading Speeds and Connectors to Full-Text Search Engines Top the List of Enhancements 4Global Cell and Tissue Culture Supplies - Strategic Business Report 2014 2Global Solid Oxide Fuel Cells (SOFCs) - Strategic Business Report 2014 2
... Microfluidic Systems (MFSI),along with its manufacturing ... invited to attend the U.S. House of,Representatives ... and Responding to Bioterrorism. MFSI will be ... The purpose,of the fair is to educate ...
... Memory,Pharmaceuticals Corp. (Nasdaq: MEMY ) today ... included an explanatory,paragraph in their opinion on the ... Report on Form 10-K for the year ended,December ... continue as a going,concern. The Company discusses this ...
... today,announced it has secured $20 million in venture ... includes Silicon Valley Bank,and Comerica Bank. Aerovance drew ... The remaining $10 million is available upon the ... interest and enthusiasm in Aerovance,and our clinical programs," ...
Cached Biology Technology:Memory Pharmaceuticals Receives Audit Opinion Containing Going Concern Qualification 2
Mouse polyclonal antibody raised against a partial recombinant LASS3. NCBI Entrez Gene ID = 204219...
... Bio-Beads SM-2 adsorbents are macroporous polystyrene ... a high surface area for adsorbing organics ... aqueous solutions. The beads are useful for ... active agents; for example, the removal of ...
MAb to Catenin beta, N-terminal (exon 2) Catenin, beta, N-terminal (exon 2)...
... Phosphate Phosphatase 2 (LPP2) ... aqueous solution Solution ... containing 0.08% sodium azide. ... the human LPP2 protein. ...
Biology Products: