Something's fishy with Columbia chinook: females carry male's genetic signature

MOSCOW--Samples in 1999 from fall chinook salmon in the Columbia River's Hanford Reach show that four-fifths of the females spawning there apparently began life as males.

The finding could provide an important clue in sorting through the complex reasons for the decline of Northwest salmon runs, although the Hanford's wild fall chinook run is among the healthiest. The researchers ruled out radiation as a possible cause of the apparent sex reversal but suggested environmental contaminants that mimic hormones or water temperature changes could be the culprits.

The research by University of Idaho and Washington State University scientists in cooperation with the Pacific Northwest National Laboratory was published in Environmental Health Perspectives, a journal of the National Institute of Environmental Health Sciences.

James J. Nagler, UI assistant professor of zoology who led the study, said the results of the genetic testing on the natural-spawning chinook came as a surprise.

"We have found that a majority of the female chinook salmon sampled carry a genetic marker that is found only in male salmon. The best explanation for these results is that these females have been 'sex reversed' and are in fact male," Nagler said. "This is not unheard of as salmon can be sex reversed experimentally under laboratory conditions. What is surprising is that this is the first report of this from a wild population of fish."

Gary Thorgaard, WSU's School of Biological Sciences director and a co-author of the paper, says that experiments in his laboratory and others have shown it is possible to reverse the sex of trout embryos through the use of hormones. A study in Canada showed changing temperature could alter the sex of young sockeye salmon.

Other authors include Jerry Bouma, UI graduate student, and Dennis Dauble, a salmon biologist at the Pacific Northwest National Laboratory operated by Battelle in Richland. Dauble, PNNL natural resources manager, has

Contact: Bill Loftus
University of Idaho

Page: 1 2 3

Related biology news :

1. Somethings fishy about new NIST food standard
2. A fishy change in diet
3. Columbia research to examine gene influence on severity of peridontal disease, therapy response
4. Columbia, Stony Brook, Guidant to develop biological pacemaker based on gene & cell therapies
5. Worlds largest scientific society holds regional meeting in Columbia, Mo.
6. New Columbia Genomic Center of Excellence aims to speed genetic targeting of medicines
7. Columbia offers new ecology program in Dominican Republic
8. Columbia professor receives 2003 National Golden Apple for Teaching Excellence
9. Columbia investigators win 2003 Gairdner International Award for research
10. Gene newly identified by Columbia researchers may improve hair removal
11. Years of research, thought lead geologist to propose new supercontinent Columbia

Post Your Comments:

(Date:4/13/2017)... 2017 UBM,s Advanced Design and Manufacturing event ... emerging and evolving technology through its 3D Printing and ... alongside the expo portion of the event and feature ... focused on trending topics within 3D printing and smart ... event will take place June 13-15, 2017 at the Jacob ...
(Date:4/11/2017)... Florida , April 11, 2017 ... a security technology company, announces the appointment of independent Directors ... Bendheim to its Board of Directors, furthering the company,s ... ... of NXT-ID, we look forward to their guidance and benefiting ...
(Date:4/4/2017)... YORK , April 4, 2017   EyeLock ... today announced that the United States Patent and Trademark ... patent broadly covers the linking of an iris image ... same transaction) and represents the company,s 45 th ... latest patent is very timely given the multi-modal biometric ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... Austin, TX (PRWEB) , ... October 11, 2017 ... ... in August compared the implantation and pregnancy rates in frozen and fresh ... the contribution of progesterone and maternal age to IVF success. , After comparing ...
(Date:10/10/2017)... ... 2017 , ... Dr. Bob Harman, founder and CEO of VetStem Biopharma, ... The event entitled “Stem Cells and Their Regenerative Powers,” was held on ... DVM, MPVM was joined by two human doctors: Peter B. Hanson, M.D., Chief of ...
(Date:10/9/2017)... 2017  BioTech Holdings announced today identification and ... ProCell stem cell therapy prevents limb loss in ... demonstrated that treatment with ProCell resulted in more ... compared to standard bone marrow stem cell administration.  ... reduction of therapeutic effect.  ...
(Date:10/7/2017)... Arizona (PRWEB) , ... October ... ... 15 years’ experience providing advanced instruments and applications consulting for microscopy and ... in-house expertise in application consulting, Nanoscience Analytical offers a broad range of ...
Breaking Biology Technology:
Cached News: