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
Belgium
May 28, 04:40 (GMT + 9):
IN BRIEF - Belgian Fish Auctions go for full traceability of fish
Canada
May 28, 04:40 (GMT + 9):
IN BRIEF - Nova Scotia and New Brunswick inshore lobster fishery achieves MSC certification
South Africa
May 28, 04:40 (GMT + 9):
IN BRIEF - South African hake celebrates 11 years of sustainability
Greece
May 28, 04:30 (GMT + 9):
IN BRIEF - Selonda approves EUR 50.4 million capital increase, by capitalising obligations to creditos
United States
May 28, 04:30 (GMT + 9):
IN BRIEF - Marijuana-Infused Smoked Salmon Is The Future Of Breakfast
United States
May 28, 04:30 (GMT + 9):
IN BRIEF - Online mapping tool shows fishery managers how to reduce bycatch
United States
May 28, 04:30 (GMT + 9):
IN BRIEF - AFRICA: Fisheries Indicators 'Too Narrow' to Show Real Impact
United States
May 28, 04:10 (GMT + 9):
IN BRIEF - Walmart U.S. Announces New Animal Welfare and Antibiotics Positions
United States
May 28, 04:10 (GMT + 9):
IN BRIEF - Commercial shrimp trawling season opening May 27 2015
India
May 28, 04:10 (GMT + 9):
IN BRIEF - Fishery experts call for proactive role in vannamei shrimp cultivation
United States
May 28, 04:10 (GMT + 9):
IN BRIEF - Louisiana shrimpers watch prices plummet in 2015
United States
May 28, 03:50 (GMT + 9):
Louisiana shrimpers worry about price drop
United Kingdom
May 28, 03:20 (GMT + 9):
IN BRIEF - Scott Nichols Named Seafood Marketer of 2015
Chile
May 28, 03:10 (GMT + 9):
Blumar faces profit drop in the first quarter
Indonesia
May 28, 02:30 (GMT + 9):
Indonesia urged to champion the interests of coastal nations at IOTC



Lenguaje
FEATURED EVENTS
  
TOP STORIES
New report reveals slavery practice on foreign chartered vessels
New Zealand Research carried out by the Auckland University reveals the existence of slave-like labour and abuse that is faced by foreign crew members working on boats operating in New Zealand waters.
EC calls for voluntary origin labelling for food
Spain The EU executive defended the position promoting the voluntary origin labelling for unprocessed food products, products that comprise a single ingredient and the ingredients that represent more than 50 per cent of a food product.
Lobster fee colletion plans go ahead
Canada While in Prince Edward Island the legislation intended to collect funds through a lobster levy is at the Marketing Council, in Nova Scotia consultations among fishermen and consumers are being conducted.
Alagoas commits to international technical cooperation to boost aquaculture and fisheries
Brazil Through the Secretariat of Agriculture, Fisheries and Aquaculture, the Government of Alagoas is devising a project on international technical cooperation in the fisheries-aquaculture sector of this state in northeastern Brazil.
 
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