Navigation Links
Scientists question indicator of fisheries health, evidence for 'fishing down food webs'
Date:11/17/2010

>An example of the problem with the measure is in the Gulf of Thailand, where the average trophic level of what is being caught is rising, which should indicate improving ecosystem health according to proponents of that measure. Instead, it turns out fish at all levels have declined tenfold since the 1950s because of overharvesting.

"The measure only declines if fisheries aimed for top predators first, but for the Gulf of Thailand the measure fails because fisheries first targeted mussels and shrimps near the bottom of the food web, before shifting to predators higher up in the food web," Branch said.

Including the Gulf of Thailand, Branch found that changes in the average trophic levels of what was being caught and what was found when fish populations were surveyed differed in 13 of the 29 trawl surveys from 14 ecosystems. Trawl surveys, generally done from research vessels, count the kinds and abundance of fish and are repeated over time to reveal trends.

Branch and his co-authors are the first to combine so many trawl surveys for analysis no one had combined more than a handful before. The trawl survey data came from efforts started three years ago by fisheries scientists and ecologists gathered at the National Center for Ecological Analysis and Synthesis in Santa Barbara, Calif. They brought together worldwide catch data, stock assessments, scientific trawl surveys, small-scale fishery data and modeling results. What emerged is the most comprehensive set of data yet for fisheries researchers and managers.

It paints a different picture from previous catch data and has revealed another major new finding: On a global scale humans don't appear to be fishing down the food web, Branch said.

The new catch data reveal that, following declines during the 1970s in the average trophic levels of fish being caught, catches of fish at all trophic levels have generally gone up since the mid-80s. Included are high-trophic predators such as bigeye tu
'/>"/>

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

Page: 1 2 3

Related biology news :

1. Jefferson scientists deliver toxic genes to effectively kill pancreatic cancer cells
2. Scientists identify novel inhibitor of human microRNA
3. Argonne scientists peer into heart of compound that may detect chemical, biological weapons
4. MU scientists go green with gold, distribute environmentally friendly nanoparticles
5. Scientists identify gene that may contribute to improved rice yield
6. Scientists discover why a mothers high-fat diet contributes to obesity in her children
7. MU scientists see how HIV matures into an infection
8. Earth scientists keep an eye on Texas
9. Thinking it through: Scientists call for policy to guide biofuels industry toward sustainability
10. Scientists identify a molecule that coordinates the movement of cells
11. Scientists Find new migratory patterns for Mediterranean and Western Atlantic bluefin tuna
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Scientists question indicator of fisheries health, evidence for 'fishing down food webs'
(Date:7/11/2014)... is creating a new professorship in tissue engineering ... for Molecular Engineering and the Marine Biological Laboratory, ... Millicent and Eugene Bell Foundation., The Eugene Bell ... Institute for Molecular Engineering. That endowed chair holder ... MBL,s Eugene Bell Center for Regenerative Biology and ...
(Date:7/11/2014)... When researchers at the National Institute of Standards ... do their work more effectively, they often prove ... Such was the case recently for M. Lorna ... in the growing specialization of glycomics. Glycomics is ... called glycans that are attached to proteins and ...
(Date:7/11/2014)... with other group members to reduce aggression and gain ... strategy for grooming activities shows a certain pattern across ... scientific journal Biology Letters . , Grooming between ... without ulterior motives. To be groomed has hygienic benefits ... another individual can provide access to infants, mating opportunities ...
Breaking Biology News(10 mins):New professorship in tissue engineering links molecular engineering, marine biology 2Baboons groom early in the day to get benefits later 2
... Biosignal Ltd and the Institute for Eye Research have ... of an antibacterial extended-wear contact lens. , The ASX-listed ... researchers at the Centre for Marine Biofouling and Bioinnovation. ... compare the safety performance of an antibacterial contact lens ...
... sign of fragility. But in the case of infectious ... menacing pathogen. Howard Hughes Medical Institute researcher have discovered ... "seeds," which spread infection much more quickly. , The ... provide scientists with new ideas for designing drugs that ...
... child burns victims cope with the trauma of scarring, ... at the Royal Children's Hospital in Brisbane. , A ... the appearance of their scars and were happier when ... liquid spray-on skin technology, which binds to the topmost ...
Cached Biology News:First human trial of antibacterial contact lens 2Brittle prions are more infectious 2Brittle prions are more infectious 3
(Date:7/10/2014)... 2014 Robert Harman, DVM, Founder and CEO ... proud to announce the relaunch of his highly informative blog, ... series called “ What are Stem Cells ?” Dr. ... straightforward foundation in the basics of stem cell therapy so ... right type of treatment when considering regenerative medicine. , A ...
(Date:7/10/2014)... Russia , July 10, 2014 ... Federation Dmitry Medvedev , presented Russia,s ... company BIOCAD . The Company is developing a ... of MabNext project BIOCAD develops a number of innovative ... and autoimmune diseases. The ceremony took place at the ...
(Date:7/10/2014)... 15, 2014 -- According to the International Atomic ... security comes from terrorists acquiring sufficient quantities of ... a crude nuclear explosive device. The IAEA also ... have involved gram-level quantities, which can be challenging ... to a new study appearing this week in ...
(Date:7/10/2014)... researchers have observed the fractional quantum Hall effect in ... matter can be tuned by an electric field. ... when electrons confined to thin sheets are exposed to ... behavior where thousands of individual electrons behave as a ... effect is well established, many details of this collective ...
Breaking Biology Technology:Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 2Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 3Dmitry Medvedev Presented BIOCAD the First National "Industry" Award 2Sensitive detection method may help impede illicit nuclear trafficking 2Columbia researchers observe tunable quantum behavior in bilayer graphene 2Columbia researchers observe tunable quantum behavior in bilayer graphene 3
... Mich.---A new $13-million National Science Foundation center based ... materials that manipulate light in new ways. The ... nanoscale lasers, high-efficiency lighting, and quantum computers. ... C-PHOM, involves engineering and physics researchers from the ...
... new system to be installed at the Rensselaer ... research possibilities across the nation and boost the ... data science, high-performance computing, and web science. ... the National Science Foundation (NSF) and with additional ...
... University-University of Oregon Center for Sustainable Materials Chemistry, born ... moving into a second phase under a new five-year, ... through its Centers of Chemical Innovation Program, will allow ... and development and boost efforts to translate basic-level discoveries ...
Cached Biology Technology:$13-million NSF center to explore new ways to manipulate light at the nanoscale 2New supercomputer to boost Rensselaer leadership in high-performance computing 2New supercomputer to boost Rensselaer leadership in high-performance computing 3New supercomputer to boost Rensselaer leadership in high-performance computing 4Center for Sustainable Materials Chemistry gets Phase 2 NSF grant 2Center for Sustainable Materials Chemistry gets Phase 2 NSF grant 3Center for Sustainable Materials Chemistry gets Phase 2 NSF grant 4
... hood is a component of ... on the transilluminator, it holds ... provides a darkroom environment that ... bench. This 13 x 17.8 ...
... Kit is a simple high performance method ... Removes detergents without significant dilution of protein ... on the Detergent-OUT Spin column and collect ... are suitable for removing detergent from a ...
... Zyagen tissue microarrays are derived from ... to rigorous quality control procedures to ensure ... are manually assembled in one block, sectioned ... mounted on coated slides. Sections are large ...
... microarrays are derived from frozen embedded tissue ... control procedures to ensure the highest quality. ... in one block, sectioned at a thickness ... slides. Sections are large (3-5 mm in ...
Biology Products: