Navigation Links
Does fishing on drifting fish aggregation devices endanger the survival of tropical tuna?
Date:5/15/2008

catches of skipjack (Katsuwonus pelamis), bigeye (Thunnus obesus) and yellowfin (Thunnus albacares) tuna, the three tropical tuna species which can be caught at drifting FADs, have been achieved using this fishing method. For the skipjack amounts taken under drifting FADs reached even as high as 72% of all catches. To check if the large-scale deployment of drifting FADs could present an ecological trap for these species, a range of biological (fish plumpness, growth rate, stomach fullness) and ecological (migration pattern and distance) indices were determined on yellowfin and skipjack captured under FADs in the Atlantic and Indian Oceans. Comparison was then made with data gathered from free-school caught individuals of these same species. A salient finding was that 74% of drifting FAD-associated skipjack had empty stomachs at the moment of capture compared with only 13% for those fished from free schools. Figures of the same order of magnitude were obtained for yellowfin, with proportions respectively reaching 49% caught on drifting FADs and 7% from free schools. The survey indicated that the tuna caught under the FADs fed less well than those fished from free schools. Moreover, the fact that for the same weight the FAD-associated specimens caught showed lower plumpness than the free-school ones could reflect a deficiency in energy-reserve accumulation in those that concentrated around the floating devices.

The research team also sought to find out if the large-scale deployment of drifting FADs could affect the migration patterns of these far-travelling fish species. Tagging surveys allowed comparison of the nature of migrations accomplished by fish moving with the drift of FADs with that of non-FAD-associated individuals. The migration directions and displacement rates in terms of daily distances travelled were indeed affected by the presence of artificial floating objects. Drifting FADs therefore appeared to act as super-stimuli, like strong magnets ex
'/>"/>

Contact: Gregory Flechet
fichesactu@paris.ird.fr
33-014-803-7607
Institut de Recherche Pour le Dveloppement
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Can certain metals repel sharks from fishing gear?
2. Fishing throws targeted species off balance, Scripps study shows
3. Oceanic sharks worldwide at serious risk from high-seas fishing, rising demand for shark products
4. Small-scale fishing in Mexico rivals industrial fisheries in accidental turtle deaths
5. Research shows loggerhead sea turtles threatened by small-scale fishing operations
6. New Silex SX-560 Enables Enterprise 802.11 Wireless Connectivity for Battery Operated Devices
7. Childrens Hospital leads projects to develop nations first heart assist devices for young children
8. Better protection for biomedial devices could result from Rutgers-Camden research
9. MIT aids creation of neural prosthetic devices
10. IGERT fellows to design biodevices using flexible electronics
11. Great apes endangered by human viruses
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/30/2014)... , Sept. 30, 2014  Spectra ... solutions for the biotech and power generation ... new RECONN Bioprocess Manager, an easy-to-use and ... geared towards bioprocess development laboratories. ... disparate bioreactor and analyzer systems. Accessing and ...
(Date:9/30/2014)... People who suffer from asthma may think there,s not ... besides properly taking medications and avoiding allergic triggers. ... Annals of Allergy, Asthma and Immunology , the scientific ... Immunology (ACAAI), asthma sufferers can learn lessons about managing ... in the Annals article improved her asthma once she ...
(Date:9/29/2014)... ramosum , coupled with a high-fat diet, may cause animals ... mBio , the online open-access journal of the American ... German Institute of Human Nutrition Potsdam-Rehbruecke in Nuthetal observed that ... gained weight when fed a high-fat diet. Mice that did ... when consuming a high-fat diet, and mice that had ...
Breaking Biology News(10 mins):Spectra Automation Introduces RECONN Bioprocess Manager 2Asthma symptoms kicking up? Check your exposure to air pollution 2Gut bacteria promote obesity in mice 2
... 95 percent genomic similarity to humans, mice have long been ... Once researchers can shine a light on the genetic factors ... prevention and treatment options to protect the human population. ... difficult road, made more challenging by the 5% difference between ...
... shown that a dramatic sea-level rise occurred at the onset ... as the Blling warming, approximately 14,600 years ago. This event, ... rapid collapse of massive ice sheets 14,600 years ago and ... are published in the 29 March 2012 issue of the ...
... The Cardiovascular Cell Therapy Research Network (CCTRN), a ... Health,s (NIH) National Heart, Lung and Blood Institute (NHLBI) ... of its seven U.S. centers of excellence. The network ... over the next seven years to help achieve its ...
Cached Biology News:New lab mice cut search for genetic links to disease by more than a decade 2New lab mice cut search for genetic links to disease by more than a decade 3Ice sheet collapse and sea-level rise at the Boelling warming 14,600 years ago 2Minneapolis Heart Institute selected to participate in Cardiovascular Cell Therapy Research Network 2
(Date:10/1/2014)... , Oct. 1, 2014  Pressure BioSciences, Inc. ... in the development and sale of high pressure-based sample ... announced it has been invited to present at the ... Warsaw , Poland.  The Conference will take ... 2014.  Mr. Richard T. Schumacher , President and ...
(Date:10/1/2014)... 2014  Spherix Incorporated (Nasdaq: SPEX) -- an intellectual property ... of intellectual property, announced today that the Markman ... in the U.S. District Court for the Northern ... been rescheduled for November 10, 2014.  This hearing ... Court Order setting the Markman date was received ...
(Date:10/1/2014)... (PRWEB) October 01, 2014 As the world ... no room for doubt that this century would mark the ... the field of medicine science. The fact that the world ... not unknown to the scientific community. Almost half of these ... therefore can be prevented with medical care and intervention. While ...
(Date:10/1/2014)... La Jolla, Calif. (PRWEB) September 30, 2014 ... (NIH) announced the initial round of grants for ... Initiative, an undertaking that aims to develop and ... neuro circuit functions of the human brain. This ... funding for fiscal year 2014 was allocated to ...
Breaking Biology Technology:Pressure BioSciences, Inc. Invited to Present at the 2nd Global Life Sciences Conference in Warsaw, Poland 2Pressure BioSciences, Inc. Invited to Present at the 2nd Global Life Sciences Conference in Warsaw, Poland 3Pressure BioSciences, Inc. Invited to Present at the 2nd Global Life Sciences Conference in Warsaw, Poland 4Markman Hearing Date for VTech and Uniden Litigation Now Set for November 10, 2014 2Fighting Mortality and Morbidity of Chronic Health Disorders during Open Access Week 2Fighting Mortality and Morbidity of Chronic Health Disorders during Open Access Week 3NIH Awards 15 Grants to CHI Members for BRAIN Initiative Research 2NIH Awards 15 Grants to CHI Members for BRAIN Initiative Research 3
... comes to consumer goods, America is addicted to them. And ... prices, Wal-Mart is the biggest low-price outlet going. We like ... it. , ,The company that many Americans hate to love ... groups have successfully derailed its growth plans in certain parts ...
... the president of an international corporation used to take a ... a PC, strong entrepreneurial spirit, and in less than 30 ... many professionals. It's estimated that 80 percent of businesses fail ... half-full' type, you might be discouraged by such an estimate. ...
... Madison, Wis. - Ann Stunden, chief information officer ... at the University of Wisconsin-Madison, has announced plans to ... helm of campus technology. , ,"We have made some ... I think we have strengthened our relationship with partners ...
Cached Biology Technology:Wal-Mart: How low can you go? 2Wal-Mart: How low can you go? 3Wal-Mart: How low can you go? 430 days to success: Three simple steps to create your own international startup 230 days to success: Three simple steps to create your own international startup 330 days to success: Three simple steps to create your own international startup 430 days to success: Three simple steps to create your own international startup 5Stunden to retire as UW-Madison CIO 2
...
Pronase Reagent...
Rabbit polyclonal to ECSIT ( Abpromise for all tested applications). entrezGeneID: 51295 SwissProtID: Q96HQ7...
Dual adapter for phosphotyrosine and 3-phosphotyrosine and 3-phosphoinositide...
Biology Products: