Home WORK AREAS Stock Assessment
Stock Assessment and Modelling
Identifying FAD-fishing
Tuesday, 25 August 2015 08:54

stevenh2015_08_25-sp_brailleTuna purse-seine catches associated with Fish Aggregation Devices (FADs) are typically more diverse than catches set on “free school” tuna, including both smaller target tuna as well a variety of bycatch species that are often discarded.  In response, an annual FAD-fishing moratorium, of several months’ duration and Pacific-wide, has been implemented since 2009.  Despite the moratorium, there remains concern about adherence to FAD-free fishing requirements.  Additionally, seafood producers and consumers seek certification regarding the source of purse seine captured tuna.

Given this background, we became interested in developing a FAD-association verification test.  We have developed a simple technique, based on observer catch sampling, to determine whether a purse seine set is likely to have been associated with a FAD.  Our methodology, which can be easily implemented “in the field”, has a prediction accuracy rate of up to 86%.  Details of the methodology have been published, in Open Access format, in the journal Fisheries Research.

Read more...
 
The best way to protect heavily depleted shark populations? Stop trying to catch them!
Friday, 12 September 2014 15:01

sheltonh2014_09_12-silky_shark_thumbFriday 12 September 2014, Secretariat of the Pacific Community (SPC), Noumea, New Caledonia

It was previously thought that the two heavily depleted pelagic sharks in the Western and Central Pacific, the silky and the oceanic whitetip, were victims of unintended bycatch, but a startling new study from the Secretariat of the Pacific Community (SPC) shows that sharks are actually being specifically targeted by some tuna longline boats operating in the equatorial Pacific Ocean.

 

Read more...
 
Lack of Access to Data Frustates Scientists
Wednesday, 16 April 2014 14:39

Honiara fishing port in Solomon Islands (Credit: Malo Hosken, Copyright: Secretariat of the Pacific Community)A meeting of over 20 stock assessment scientists from the Asia–Pacific region last week heard that the scientific assessment of tunas in the western and central Pacific Ocean (WCPO) continues to be hampered by some fishing states not making data available to scientists. Dr Shelton Harley, head of the Stock Assessment and Modelling team within the Secretariat of the Pacific Community (SPC) Oceanic Fisheries Programme noted that ‘the most frustrating aspect is that the data have been collected and are just sitting on computers in countries and not contributing to the efforts to determine the health and safe harvest levels for the largest tuna resource in the world.

Read more...
 
Condition of bigeye tuna in the western and central Pacific worsening, skipjack and yellowfin healthy – new SPC assessments released
Friday, 25 July 2014 15:48

johnh2014_07_25_thumbFriday 25 July 2014, Secretariat of the Pacific Community (SPC) headquarters, Noumea, New Caledonia

The Secretariat of the Pacific Community (SPC) this week released new assessments on the status of key regional tuna stocks – skipjack, yellowfin and bigeye tuna – which show that skipjack and yellowfin remain in a reasonably healthy state, but bigeye, the mainstay of the tropical longline fishery, has now been reduced to less than 20% of its unfished stock size. The assessments, along with over 40 scientific papers produced by SPC, are due to be presented at the 10th meeting of the Western and Central Pacific Fisheries Commission (WCPFC) Scientific Committee, being held in Majuro, Marshall Islands, in early August.

Read more...
 
SPC scientists tackle stock assessment for blue sharks in the North Pacific Ocean
Friday, 14 February 2014 09:14

sheltonH2014_02_14_thumbSPC stock assessment scientists Shelton Harley and Joel Rice have just returned from a one week blue shark stock assessment workshop in San Diego, California. Here Shelton reports on what makes this assessment a little different to others typically undertaken by SPC.

The assessment for blue sharks in the North Pacific is the third shark stock assessment undertaken by SPC as part of our service agreement to the Western and Central Pacific Fisheries Commission (WCPFC). Two unique features of this assessment are: 1) that it covers an area outside of the mandate of the WCPFC and therefore requires close collaboration with the Inter-American Tropical Tuna Commission (IATTC) and the International Scientific Committee for tuna and tuna-like species (ISC); and 2) the SPC stock assessment is one of two that are to be undertaken for the stock.

Read more...
 
«StartPrev1234NextEnd»

Page 2 of 4
Copyright © 2018 Oceanic Fisheries Programme. All Rights Reserved.
Joomla! is Free Software released under the GNU/GPL License.
 
OFP Newsfeed
   SPC Homepage | About SPC | Copyright © SPC 2010