Welcome to FIS   Sponsored By
United States
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
editorial@fis.com
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
Spain
Sep 23, 03:50 (GMT + 9):
Eliminating discards 'is very complicated,' ensures ICES president
Indonesia
Sep 23, 03:10 (GMT + 9):
Shrimp virus antidote found by CP Prima
Worldwide
Sep 23, 02:30 (GMT + 9):
Hyatt vows to source ASC certified seafood
New Zealand
Sep 23, 01:40 (GMT + 9):
Joint project to research the mussel economic potential
Portugal
Sep 23, 01:00 (GMT + 9):
Portuguese sardine fishery faces new setback
Spain
Sep 22, 23:50 (GMT + 9):
NAFO annual meeting to set TACs for 2015
Argentina
Sep 22, 23:30 (GMT + 9):
Newsan increases investments in fishing industry
Canada
Sep 22, 22:40 (GMT + 9):
IN BRIEF - AgriMarine Launches ATI-an Aquaculture Technology Subsidiary
United States
Sep 22, 22:40 (GMT + 9):
IN BRIEF - Cast-netting white shrimp can be fruitful in the fall, but there are rules
Norway
Sep 22, 22:40 (GMT + 9):
Mitsubishi offers USD 1.4 billion for Cermaq
Russian Federation
Sep 22, 22:30 (GMT + 9):
IN BRIEF - Russia turns back 40 tonnes of banned fish re-exported via Ukraine
United States
Sep 22, 22:30 (GMT + 9):
IN BRIEF - U.S. shrimp farmers cash in on demand
Oman
Sep 22, 22:30 (GMT + 9):
IN BRIEF - Export of some fish species banned in Oman
United States
Sep 22, 22:30 (GMT + 9):
IN BRIEF - Farmed oyster sales, profits on the rise
Argentina
Sep 22, 22:10 (GMT + 9):
Anchovy prospected in hake closed area



Lenguaje
FEATURED EVENTS
  
TOP STORIES
21 illegally caught bluefin tuna specimens intervened
Spain Under the Fisheries Act of the State, Fisheries Inspection Service personnel intervened 21 bluefin tuna (Thunnus thynnus) specimens in the Strait of Gibraltar that had been captured illegally.
New control measures stir opposition
Republic of Ireland The fisheries authorities have decided to implement new measures to regulate the fish weighing system due to alleged irregularities detected in factories, but they have generated reject from fishermen and processors.
Warmer oceans could increase expansion of invasive, native species
United States Warming water temperatures due to climate change could expand the range of many native species of tropical fish, a study reveals.
Four countries join efforts to protect Japanese eel
Japan Eel farmers’ procurement of glass eels or young specimens has been curbed by 20 per cent from the level in the preceding 12 months starting in November in an attempt to protect Japanese eel (Anguilla japonica) stocks.
 
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-
Grupo Calvo - Luis Calvo Sanz, S.A. (Group 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
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 - 2014 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER