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


A pink salmon affected by sea lice. (Photo: Alexandra Morton)

Link between sea lice and deaths in wild salmon confirmed

Click on the flag for more information about Canada CANADA
Wednesday, August 24, 2011, 22:40 (GMT + 9)

A new study has linked sea lice outbreaks at British Columbia (BC) fish farms to greater mortality among wild pink and coho salmon populations. These findings challenge the conclusion of a recent study on pink salmon that failed to establish a connection between sea lice and wild salmon deaths.

"Our work suggests that when one looks at all the available evidence there is indeed good reason to minimize lice on farmed salmon and the potential for their transmission to wild fish," asserted Brendan Connors, a Simon Fraser University (SFU) researcher who co-authored the study.

Overall, very few of the salmon hatched in freshwater rivers return from the ocean to spawn as adults, as most of them die due to a variety of causes, Connors explained, CBC News reports.

"The question is even if some sea lice come from salmon farms and infect fish and possibly even kill them, does that really matter in the grand scheme of things?" he added.

Last December, a study led by University of California Davis (UC Davis) researcher Gary Marty determined that there is no link between the survival of wild pink salmon populations and the number of sea lice on fish farmed nearby in the Broughton Archipelago. The team analyzed 10-20 years of fish farm data and 60 years of pink salmon data.

The new study, led by Martin Krkosek, a Canadian researcher at the University of Otago in New Zealand, used Marty's fish farm data in combination with population data for a wider geographic region. It also incorporated another species of salmon — coho — and a larger time frame: 1970-2009.

Krkosek’s team found that high sea lice populations among fish in aquaculture sites corresponded with far higher mortality among wild salmon that swam near the farms, versus those that did not swim near fish farms, Krkosek explained.



In contrast, low sea lice populations did not lead to a difference in mortality between wild fish either near or far away from salmon farms. At the same time, Krkosek admitted that a wide variation exists in the effect of sea lice contingent on their levels.

Regardless of the abundance of sea lice, if any, four out of five juvenile salmon die within their first couple of months out in ocean water because they get eaten, he noted.

But his findings demonstrate that out of the survivors from those five salmon, up to four-fifths may die because of sea lice from fish farms.

"Management and policy measures designed to protect the wild population from salmon farms will in fact have benefits for pink and coho salmon as well as coastal economies and the coastal ecosystems that depend on the salmon," he affirmed.

Krkosek and Connors’s study was funded by the federal government and the non-profit environmental groups Watershed Watch Salmon Society and  The SOS Marine Conservation Foundation.

The study’s results will be published this week’s issue of Proceedings of the National Academy of Sciences.

Related articles:

-
New study links wild sea lice to salmon farms 
-
Lice infests wild salmon all along BC coast: study 
-
Sea lice not the culprit of the 2002 wild salmon collapse: study 

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


 Print


Click to know how to advertise in FIS
MORE NEWS
Chile
Jun 29, 07:00 (GMT + 9):
New strong QTL for SRS resistance in salmon coho will contribute to decrease the use of antibiotics
Uganda
Jun 29, 03:00 (GMT + 9):
IN BRIEF - Govt Fears Fish Export Ban Over Pollution
United Kingdom
Jun 29, 03:00 (GMT + 9):
IN BRIEF - UK risks becoming 'dumping ground' for plastic after Brexit
Canada
Jun 29, 03:00 (GMT + 9):
IN BRIEF - DFO plan for at-sea observers met with skepticism by lobster fishermen
United States
Jun 29, 03:00 (GMT + 9):
IN BRIEF - Jellied sea creatures confound scientists, fishermen on U.S. Pacific Coast
Bangladesh
Jun 29, 03:00 (GMT + 9):
IN BRIEF - Climate change takes its toll on fish: experts
Russian Federation
Jun 29, 03:00 (GMT + 9):
IN BRIEF - South Korean businessmen to build fish processing house in Russia
Norway
Jun 29, 03:00 (GMT + 9):
IN BRIEF - Norway salmon biomass up 5 pct y-o-y in May 2017-Seafood Norway
New Zealand
Jun 29, 03:00 (GMT + 9):
IN BRIEF - Online conference to examine impact of plastic waste
India
Jun 29, 03:00 (GMT + 9):
IN BRIEF - Grant puts aquaculture program front and center
Norway
Jun 29, 02:10 (GMT + 9):
Cleaner fish need better feed to be more efficient lice-eaters
United Kingdom
Jun 29, 02:00 (GMT + 9):
IN BRIEF - MSC Board strengthens stakeholder engagement and consultation
Philippines
Jun 29, 02:00 (GMT + 9):
IN BRIEF - Seafood distributor turns 20, eyes own retail shop
Hong Kong
Jun 29, 01:10 (GMT + 9):
Malachite green detected in tilapia sample
Canada
Jun 29, 01:00 (GMT + 9):
Enviromentalists urge federal government to stop GM salmon project



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Study reveals strong juvenile trout drop in the ocean
Canada A new study tracking 35-year trends for more than 40 steelhead populations determined that declining numbers of steelhead trout in the rivers flowing through British Columbia, Washington state, and Oregon are linked to poor survival of young fish in ocean environments.
Latin American countries agree on coordinated work to combat illegal fishing
Chile A call to union and regional technical cooperation to strengthen surveillance actions were made by representatives of Latin America participating in the first international tour on illegal, unreported and unregulated fishing.
Purse seine fleet ends bluefin tuna season closes three days before closure
European Union The bluefin tuna fishing season in the Western and Central Mediterranean Sea and in the Adriatic Sea ended last June 21 for the European Union purse seine fleet, three days before the official closure.
CSIRO develops breakthrough technology to combat IUU fishing
Australia Commonwealth Scientific and Industrial Research Organisation has developed a world first notification system that alerts authorities when vessels engaged in illegal, unregulated and unreported fishing arrive in port.
 
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. - Headquarters
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 - 2017 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER