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
China
May 25, 03:00 (GMT + 9):
Aquatic Foods experiences drop in profits in Q1 despite volume increased sales
Viet Nam
May 25, 02:00 (GMT + 9):
Prolonged drought hits shrimp breeding industry
United States
May 25, 01:10 (GMT + 9):
Ocean acidification could endanger Northwest Dungeness crab
New Zealand
May 25, 00:40 (GMT + 9):
IN BRIEF - Computer-aided vaccine designing approach against fish pathogens Edwardsiella tarda and Flavobacterium columnare using bioinformatics
United States
May 25, 00:40 (GMT + 9):
IN BRIEF - Oceana report calls on more trawls to be equipped with TEDs, and for smaller spacing between bars to reduce bycatch
Mexico
May 25, 00:40 (GMT + 9):
IN BRIEF - 'Aquatic cocaine': Fish bladders are latest Mexican smuggling commodity
United States
May 25, 00:30 (GMT + 9):
IN BRIEF - Selectively Fishing for Lingcod in Protected Areas Avoids Hampering Recovery of Other Fish
United States
May 25, 00:30 (GMT + 9):
IN BRIEF - Squid Are Thriving While Fish Decline
New Zealand
May 25, 00:30 (GMT + 9):
IN BRIEF - Legal glitch over government prosecuting of dumping of fish
Argentina
May 25, 00:30 (GMT + 9):
China and Argentina deepen discussion on fishery issues
India
May 25, 00:00 (GMT + 9):
IN BRIEF - Fish seed on 100 per cent subsidy: Minister
Viet Nam
May 25, 00:00 (GMT + 9):
IN BRIEF - Fishermen cast their votes
United States
May 25, 00:00 (GMT + 9):
IN BRIEF - Savvy squid, octopuses on rise despite warming ocean
Viet Nam
May 25, 00:00 (GMT + 9):
IN BRIEF - Tilapia development scheme passed
United Kingdom
May 24, 23:50 (GMT + 9):
Ultrasound could increase salmon harvest volumes



Lenguaje
FEATURED EVENTS
  
TOP STORIES
HSMI evidence detected in farmed salmon
Canada A team of international researchers has diagnosed a potential heart and skeletal muscle inflammation in farmed Atlantic salmon samples collected from a BC aquaculture facility in 2013-2014.
Is New Zealand's hoki McDonald’s sources from really sustainably?
New Zealand Environmentalists have urged McDonald's to stop sourcing its fish from New Zealand waters following the leak of a confidential report casting doubts on the sustainability of fish that are widely used by the fast food giant.
WWF urges IOTC to cut Indian Ocean yellowfin tuna catches
Worldwide Indian Ocean yellowfin tuna stocks may collapse without better regulation, warns WWF.
EU puts off deadline for Thailand to address illegal fishing
Thailand The EU has given Thailand another six months to end illegal fishing over a year after Brussels threatened Bangkok with a ban on Thai seafood product import.
 
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+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Nueva Pescanova, S.L. - Group Headquarters
Sea Harvest Corporation (PTY) Ltd.
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
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 - 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 - 2016 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER