Welcome to FIS   Sponsored By
United States
Subscribe to FIS | Register with FIS | Advertise with FIS | Newsletter | About FIS | Contact us
   


Five-millimetre length bluefin larvae. (Photo: IEO / Fernando de la Gandara)

Oceanographic structures condition bluefin tuna spawning in the Mediterranean

Click on the flag for more information about Spain SPAIN
Wednesday, January 16, 2013, 02:10 (GMT + 9)

Spanish scientists discovered that there is a clear relationship between the spawning areas of bluefin tuna in the Mediterranean Sea and the oceanographic structures.

That is one of the main conclusions of a study on the regional scale spatial distribution of spawning areas of three tuna species of major economic importance in the Mediterranean Sea: bluefin, albacore and bullet tuna.

The research was conducted by a team of researchers from the Balearic Oceanography Centre of the Spanish Institute of Oceanography (IEO), in collaboration with the Balearic Islands Coastal Observing and Forecasting System (ICTS SOCIB) and the University of Corvallis, Oregon (US).

Scientists analyzed data obtained from biological and hydrographic oceanographic surveys carried out for five years and found a difference in the factors that influence the distribution of the spawning areas of the three species in the Balearic Sea.

They found that the main spawning areas for bluefin tuna (Thunnus thynnus) are clearly associated with certain oceanographic structures, mainly related to the location of the fronts separating waters of recent Atlantic origin (which go into the Strait of Gibraltar and move up to Balearic Islands) and residents waters, which can vary each year, according to the IEO.

Likewise, they found that the spawning areas of albacore tuna (Thunnus albacares) are also associated with oceanographic structures, but in this case with changes induced by topography that are annually built in the same areas.

Both the blufin and albacore tuna primarily spawn in deep water, unlike the bullet tuna (Auxis rochei), which usually lays eggs in more coastal areas, where adults usually live.

During the investigation, the team also managed to better define the spawning season of these resources:

  • Bluefin tuna spawns primarily between mid-June and July;
  • Albacore tuna lays eggs later, in late July and early August;
  • Bullet tuna has a longer spawning period, from June to August, without so marked peaks.

"The differences in the distribution pattern of the spawning grounds of the three species allow us to elucidate their possible migration routes: from the Atlantic to the Mediterranean Sea for the bluefin, across the Mediterranean for the albacore and from the coastal areas for the bullet tuna," the authors explained.

They also determined that bluefin tuna largely bases itself on environmental signals, so tits spawning habitats may vary depending on the environment. Instead, the spawning habitat of albacore and bullet tuna is primarily conditioned by geography.

This study was developed in the framework of the Larval Ecology and Recruitment Processes of Decapod, Cephalopods and Teleost Fishes project in the Balearic Sea and was funded by the National R&D&i Plan of the Ministry of Economy and Competitiveness.

By Analia Murias
editorial@fis.com
www.fis.com

 


 Print


Click to know how to advertise in FIS
MORE NEWS
United States
Jul 4, 04:20 (GMT + 9):
IN BRIEF - Commission denies Barham authority to open white-shrimp season
India
Jul 4, 04:20 (GMT + 9):
IN BRIEF - Black tiger shrimp to become the new vannamei
United States
Jul 4, 04:20 (GMT + 9):
IN BRIEF - Louisiana to receive several billion dollars as part of massive BP oil spill settlement with Gulf states
Thailand
Jul 4, 04:20 (GMT + 9):
IN BRIEF - No big impact from moored fishing boats
United States
Jul 4, 04:20 (GMT + 9):
IN BRIEF - La. shrimpers, environmentalists applaud new law
India
Jul 3, 23:50 (GMT + 9):
Seafood exports reach historic record
Mexico
Jul 3, 23:40 (GMT + 9):
Fisheries and aquaculture byproducts become an alternative to feed snappers
Spain
Jul 3, 23:10 (GMT + 9):
Red tide negatively affects mussel supply in Galicia
European Union
Jul 3, 22:50 (GMT + 9):
EU increases minimum size limit for northern sea bass
Chile
Jul 3, 22:20 (GMT + 9):
Blumar does not forecast significant financial impact due to ISA virus
Norway
Jul 3, 21:20 (GMT + 9):
Salmon price status at week 27
European Union
Jul 3, 04:00 (GMT + 9):
Supplementing salmon populations may worsen their decline
United States
Jul 3, 03:30 (GMT + 9):
IN BRIEF - Seafood exporters seek aquaculture master plan
United States
Jul 3, 03:30 (GMT + 9):
IN BRIEF - Marine salmon fishing expands to many areas of Puget Sound and Strait
Ecuador
Jul 3, 03:30 (GMT + 9):
IATTC rejects fishing quota increase to three countries



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Report highlights tuna industry efforts, but also inaction in some fisheries
Worldwide In its latest annual report, ISSF outlines progress and achievements for tuna sustainability in 2014 and lays out the various needs for continuous improvement of global tuna fisheries through collaboration and advocacy.
Supplementing salmon populations may worsen their decline
European Union Supplementing declining salmon populations with fish from other genetically distinct populations may not be the best method of conservation, according to a recent European study.
Tesco's sales fall while Aldi and Lidl consolidate
United Kingdom Britain's biggest supermarket chain Tesco reported a fall in sales amounting to 1.3 per cent in its first quarter, lower than expected, whereas Morrisons, Aldi and Lidl achieved growth in their sales.
Fishing industry maintains stable growth
Russia Fed. The Russian fishing industry has remained stable in the last three years, with catches amounting to around 4.3 million tonnes of fish annually, according to the Russian State Statistics Service.
 
Maruha Nichiro Corporation
Nichirei Corporation -Headquarter-
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation -Wartsila Group Headquarter-
ITOCHU Corporation -Headquarter-
BAADER - Nordischer Maschinenbau Rud. Baader GmbH (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Pescanova, S.A. - Group Headquarters
Sea Harvest Corporation (PTY) Ltd.
I&J - Irvin & Johnson Limited
Blue Continent Products (Pty) Ltd - (Oceana Group Limited)
Pesquera San Jose S.A.
Nutreco N.V. - Head Office
CNFC China National Fisheries Corporation - Group Headquarters
W. van der Zwan & Zn. B.V.
SMMI - Sunderland Marine Mutual Insurance Co., Ltd. - Headquarters
Icicle Seafoods Inc. -Headquarter-
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel ehf - Group Headquarters
SalMar ASA - Group Headquarters
Sajo Industries Co., Ltd
Hansung Enterprise Co.,Ltd.
BIM - Irish Sea Fisheries Board (An Bord Iascaigh Mhara)
CEFAS - Centre for Environment, Fisheries & Aquaculture Science
COPEINCA ASA - Corporacion Pesquera Inca S.A.C.
Chun Cheng Fishery Enterprise Pte Ltd.
Food Project (Siam) Co., Ltd.
VASEP - Vietnam Association of Seafood Exporters & Producers
Gomes da Costa
Furuno Electric Co., Ltd. (Headquarters)
NISSUI - Nippon Suisan Kaisha, Ltd. - Group Headquarters
FAO -Food and Agriculture Organization- Fisheries and Aquaculture Department (Headquarter)
Hagoromo Foods Co., Ltd.
Koden Electronics Co., Ltd. (Headquarters)
A.P. Møller - Maersk A/S - Headquarters
BVQI - Bureau Veritas Quality International (Head Office)
UPS - United Parcel Service, Inc. - Headquarters
Hamburg Süd Group - (Headquearters)
Armadora Pereira S.A. - Group Headquarters
NOAA - National Oceanic and Atmospheric Administration (Headquarters)
Omega Protein Corporation -Headquarter-
Marona S.A.
Marine Harvest ASA - Headquarters
Marubeni Europe Plc -UK-
Findus Ltd
Icom Inc. (Headquarter)
WWF Centroamerica
Oceana Group Limited
The David and Lucile Packard Foundation
Ajinomoto Co., Inc. -Headquarter-
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
Mitsubishi Corporation Marine Products Depts. D.Team
CJ Corporation  -Holding Headquarter-
Greenpeace International - The Netherlands
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
Ocean Trawlers Group - Ocean Trawlers HK Ltd.
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation -Headquarter-
AKBM - Aker BioMarine ASA
Seafood Choices Alliance -Headquarter-
Austevoll Seafood ASA
Walmart / Wal-Mart Stores, Inc. (Supermarket) -Headquarter-
New Japan Radio Co.Ltd (JRC) -Head Office-
Gulfstream JSC
INVE Group - Head Office
Marine Stewardship Council - MSC Worldwide Headquarters
Royal Dutch Shell plc (Headquarter)
Genki Sushi Co.,Ltd -Headquarter-
Iceland Pelagic ehf
AXA Assistance Argentina S.A.
Caterpillar Inc. - Headquarters
Tiger Brands Limited
Morpol ASA - Group Headquarters
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2015 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER