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


Glass elver eel. (Photo: New Zealand Goverment)

Japanese elvers' feeding no longer a mystery

Click on the flag for more information about Japan JAPAN
Monday, November 26, 2012, 01:30 (GMT + 9)

Japanese researchers may have opened the door to large-scale, commercial eel farming: they discovered that after hatching, Japanese elvers probably feed on dead zooplankton and phytoplankton.

The study’s findings on these larvae, called leptocephali, near the Mariana Trench were published in a recent issue of Biology Letters, a journal of Britain's Royal Society.

"Further research on the development of better feed and an effective farming system is needed," Katsumi Tsukamoto, a professor at the University of Tokyo, said. "If the production of young Japanese eels becomes commercially viable, we can protect wild eels."

The latest discovery by researchers at the University of Tokyo's Atmosphere and Ocean Research Institute, the Japan Agency for Marine-Earth Science and Technology and the national eel farming research organisation Irago Institute, used a method developed in 2009 by Naohiko Okochi, a programme director at the Japan Agency for Marine-Earth Science and Technology, to approximate the trophic levels of organisms in food chains, Jiji Press reports.

Okochi’s method calculated the nitrogen isotopic composition of two amino acids in the larvae of eels both wild and cultivated at the Irago Institute to determine what they ate.

The researchers also figured out that the ideal temperature for dead microscopic animals and plants is about 25 °C, at about 100-150m in depth, forming “marine snow” as they sink toward the seabed. This zone makes for a good feeding ground for young eels.

This latest finding could help make eel farming a reality in Japan. In 2010, Japan's Fisheries Research Agency set up the world's first completely artificial eel farm, where it raised adult eels using eggs from adult eels raised at the institution -- but the feed, including shark eggs and krill extract, did not bode well for successfully raising adult eels.

Another challenge faced by the budding industry is the need to have water circulate constantly in the tank, as otherwise the elvers float to the surface and die. The water must also be changed regularly to avoid the spread of bacteria from the feed.

 

By Natalia Real
[email protected]
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
New Zealand
Jul 26, 03:50 (GMT + 9):
IN BRIEF - MPI to host public meeting on proposed changes to aquaculture standards
Zambia
Jul 26, 03:50 (GMT + 9):
IN BRIEF - Govt urged to regulate fish imports – ADAZ
France
Jul 26, 03:50 (GMT + 9):
IN BRIEF - Les Mousquetaires Develops Aquaculture Cooperative
United Kingdom
Jul 26, 03:00 (GMT + 9):
IN BRIEF - Scientists hope fish clues aid spinal cord injury treatment
Canada
Jul 26, 03:00 (GMT + 9):
IN BRIEF - Aquaculture environmental assessment decision has NDP’s support
United States
Jul 26, 03:00 (GMT + 9):
IN BRIEF - Oxygen-sucking algae bloom blamed for fish die-off in south Boulder's Tantra Lake
United States
Jul 26, 03:00 (GMT + 9):
IN BRIEF - U.S. Senate looks to renew ‘Frankenfish’ import ban
United Kingdom
Jul 26, 03:00 (GMT + 9):
IN BRIEF - Marine Harvest seeks to fill posts at Skye factory
Canada
Jul 26, 03:00 (GMT + 9):
IN BRIEF - Premier says government considering appeal of aquaculture ruling
Australia
Jul 26, 03:00 (GMT + 9):
IN BRIEF - Tassal salmon farm at Okehampton Bay 'puts calving southern right whales at risk'
Oman
Jul 26, 03:00 (GMT + 9):
Seafood production grows 6.1 pct in Q1
Chile
Jul 26, 02:50 (GMT + 9):
Scientific vessel starts hake assessment
Canada
Jul 26, 02:30 (GMT + 9):
Grieg believes aquaculture ruling will not jeorpadise its Newfoundland's project
United Kingdom
Jul 26, 01:30 (GMT + 9):
Nordic group acquires two British salmon suppliers
Honduras
Jul 26, 00:30 (GMT + 9):
Tilapia exports fall 17 pct in the first four months



Lenguaje
FEATURED EVENTS
  
TOP STORIES
INPLF joins a global collaboration to research fishing communities
Indonesia A team of international partners and local stakeholders is to develop a project intended to help build long-term research capability for marine planning in East and Southeast Asia over the next four years and support local coastal communities.
Snow crab fishery closes to protect right whales
Canada Fisheries and Oceans Canada decided the closure of snow crab season in the Southern Gulf of St. Lawrence with the aim of protecting North Atlantic right whales from risks posed by the crustacean fishing gear in the area.
Zebrafish embryo cryopreservation achieved by using gold nanotechnology and laser
United States Researchers at the University of Minnesota and the Smithsonian Conservation Biology Institute have been able to provide the first-ever reproducible evidence for the successful cryopreservation of zebrafish embryos.
SAMS leads global project to ensure seaweed sustainability
Worldwide Scientists from seven international research institutes are to develop a project intended to provide solutions and training in seaweed disease prevention and identification to aid the sustainable growth of this vital industry in developing countries.
 
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
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. - Headquarters
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
Mitsubishi Corporation Marine Products Depts. D.Team
CJ Corporation  - Group Headquarters
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 - 2017 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER