Navigation Links
Potential harvest of most fish stocks largely unrelated to abundance
Date:1/14/2013

Fisheries managers should sharpen their ability to spot environmental conditions that hamper or help fish stocks, rather than assuming that having a certain abundance of fish assures how much can be sustainably harvested.

That's because the potential harvest of fish is only closely linked to abundance in 18 percent of 230 fish stocks assessed in a University of Washington-led study, according to Ray Hilborn, UW professor of aquatic and fishery sciences. For the other 82 percent of stocks, potential harvest of fish was primarily controlled by irregular shifts in environmental conditions or was random and not controlled by either abundance or shifts in environmental regimes.

Yet targets based on abundance of fish stocks are the mainstay of most management plans in the U.S. and a growing number of other countries: If a stock reaches certain abundance, it is thought, then potential harvest is maximized.

The findings are being published the week of Jan. 14 in the online early edition of the Proceedings of the National Academy of Sciences.

"There have been competing ideas about productivity," Hilborn said. "One is that it depends primarily on abundance. The other is that productivity of a stock mostly depends on whether there's a period of good conditions or a period of bad conditions."

"What we've done in this study is take 230 fish stocks and ask which of these explanations explains the data for each fish stock better," he said.

In contrast to the 18 percent of stocks where abundance controls productivity, there were 39 percent of stocks more than two times as many where productivity appears to jump between periods of high and low environmental regimes in an irregular fashion. Another 30 percent showed a weak relationship between productivity and abundance mixed in with irregular regime shifts. The remaining 13 percent fluctuated randomly.

"Regime shifts can affect the number of young fish
'/>"/>

Contact: Sandra Hines
shines@uw.edu
206-543-2580
University of Washington
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Epigenetic signatures direct the repair potential of reprogrammed cells
2. New insight into mechanisms behind autoimmune diseases suggests a potential therapy
3. Interventional radiology: Potential breakthrough to treat mens enlarged prostate
4. Researchers report potential for a moderate New England red tide in 2012
5. Gallbladder shown as potential stem cell source for regenerative liver and metabolic disease
6. Researchers find potential dark side to diets high in beta-carotene
7. Beehive extract shows potential as prostate cancer treatment
8. Gene therapy for hearing loss: Potential and limitations
9. Folic acid food enrichment potentially protective against childhood cancers
10. Nuisance seaweed found to produce compounds with biomedical potential
11. Potential new approach to regenerating skeletal muscle tissue
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/27/2014)... Using functional near infrared spectroscopy (fNIRS), Kessler Foundation ... people with multiple sclerosis (MS) and healthy controls. ... brain activation was studied using fNIRS while participants ... cognition using functional near infrared spectroscopy (fNIRS) in ... by Brain Imaging and Behavior . Authors ...
(Date:8/27/2014)... Many African-Americans may not be getting effective doses of ... Hopkins suggests. The initial dosing studies, completed before the ... generally lack a protein that is key to removing ... people with maximum levels of the protein including ... maraviroc in their bodies compared to those who lack ...
(Date:8/27/2014)... found in forests has created a thriving habitat for ... new University of Georgia study has found. , Japanese ... the early 1900s, is one of the most pervasive ... dozen states in the past century, particularly in the ... can survive in widely diverse ecosystems and has been ...
Breaking Biology News(10 mins):Kessler Foundation researchers publish first study of brain activation in MS using fNIRS 2Dosage of HIV drug may be ineffective for half of African-Americans 2More wolf spiders feasting on American toads due to invasive grass, UGA study shows 2More wolf spiders feasting on American toads due to invasive grass, UGA study shows 3
... WORCESTER, Mass. Small, mobile sequences of DNA left ... their ability to move around the genome, pose a significant ... Considered genetic parasites, these transposable elements are believed to comprise ... of the damage transposons can do to an organism,s DNA, ...
... a simple, paper-based test for drug-resistant tuberculosis (TB) is ... chemist, whose project just received a $1.6 million point-of-care ... initiative created by the Bill & Melinda Gates Foundation. ... minds across scientific disciplines to work on solutions that ...
... the process of officially recognizing new plant species, botanists ... of new species, and publication in online academic journals ... publication. The new rules, which were approved at ... Botanical Congress in July, become effective January 1, 2012. ...
Cached Biology News:Defending the genome 2Defending the genome 3University of Texas chemist receives major grant to improve detection of drug-resistant tuberculosis 2Ave Atque Vale: Botany bids 'hail and farewell' to Latin-only descriptions in 2012 2Ave Atque Vale: Botany bids 'hail and farewell' to Latin-only descriptions in 2012 3
(Date:8/27/2014)... 2014 Remcom announces an update to ... features for the biomedical industry. The central biomedical ... Sensor, exclusive to the Bio-Pro version of the software. ... developed to calculate the biological effects of electromagnetic fields. ... to all versions to expand engineers’ post-processing options. , ...
(Date:8/27/2014)... Hunting Valley, Ohio (PRWEB) August 27, 2014 ... five students from Cleveland's University School ... at Case Western Reserve University’s School of ... program provides students with an unparalleled professional experience ... with the School of Medicine faculty and students ...
(Date:8/26/2014)...  NeuroSigma, Inc., a Los Angeles ... today announced that it has filed a registration statement ... Commission relating to a proposed initial public offering of ... offered and the price range for the proposed offering ... will act as the book-running manager for the proposed ...
(Date:8/26/2014)... , Aug. 26, 2014 An analysis ... structures of all Mers CoV virus strains ... structures back to 2012.  This conservation and sharing of ... a Synthetic Mers CoV Blocker-Vaccine™ candidate, as it did for ... vaccine, both of which have been found to be ...
Breaking Biology Technology:Remcom Announces Enhanced Biological Thermal Sensor and Other Biomedical Features in XFdtd EM Simulation Software Update 2Remcom Announces Enhanced Biological Thermal Sensor and Other Biomedical Features in XFdtd EM Simulation Software Update 3Students at Cleveland's University School Conduct Biomedical Research at Case Western Reserve University’s School of Medicine 2
... June 10, 2011 /PRNewswire-Asia-FirstCall/ -- China Cord Blood Corporation (NYSE: ... provider of cord blood collection, laboratory testing, hematopoietic stem cell ... financial results for the fourth quarter and fiscal year of ... Fourth Quarter of Fiscal 2011 Highlights Revenue ...
... 10, 2011 Sono-Tek Corporation (OTCQB: SOTK) today announced ... on Monday June 13, 2011, a scientific paper titled: ... Agents," at the Institute of Food Technologists, 2011 Annual ... annual event gathers thousands of professional experts from all ...
... Generex Biotechnology Corporation (OTCBB: GNBT) ( www.generex.com ) today ... stockholders held on June 8, 2011. (Logo: ... of stockholders, the following directors were elected to serve ... meeting of stockholders:  John Barratt, Brian McGee, Nola Masterson, ...
Cached Biology Technology:China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 2China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 3China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 4China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 5China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 6China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 7China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 8China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 9China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2011 10Sono-Tek to Present Scientific Paper on Food Safety at the IFT, as E. Coli Outbreak Affects Europe's Food Supply 2Generex Announces Results of Annual Stockholders' Meeting 2Generex Announces Results of Annual Stockholders' Meeting 3Generex Announces Results of Annual Stockholders' Meeting 4
... Ham's F-12 was developed for culturing hybrid ... The modification consists of doubling the amino ... The salt concentrations have been altered as ... sulfate per liter, which may render it ...
... peptide whose sequence corresponds to residues 1-18 from rat rab 3D. ... M(1) - A - S - A - S - E ... R - D - A - A - D - Q ... and control experiments with the polyclonal antibody that reacts with this ...
... Bisulfite Kit enables complete conversion of ... than 6 hours. The highly sensitive ... DNA degradation and a spin-column-based purification ... and reliable results for all downstream ...
... or individual RNA sequences from high throughput synthesis ... RNAs from LC Sciences. These products provide a ... of DESIGNED sequences delivered in a microtube as ... a single verified RNA sequence. This is a ...
Biology Products: