Welcome to FIS   Sponsored By
United States
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


Click to know how to advertise in FIS
Oct 21, 03:30 (GMT + 9):
New eco-efficient technology to reduce canning industry pollution
Oct 21, 03:10 (GMT + 9):
Fisheries Ministry and sector ‘shocked’ by phosphate mining clearance
United States
Oct 21, 01:50 (GMT + 9):
Maine shrimp fishery future to be decided next month
Oct 21, 00:40 (GMT + 9):
Fishermen threaten to call a strike
Oct 20, 23:50 (GMT + 9):
Ending illegal fishing is key to restore overfished fisheries
Oct 20, 23:30 (GMT + 9):
Certain fish parasites may do more good than harm
Republic of Ireland
Oct 20, 22:50 (GMT + 9):
Irish fishermen to catch 10,500 tonnes more of mackerel in 2017
Oct 20, 22:30 (GMT + 9):
Fishing sector growth drives Peruvian economy
Oct 20, 22:20 (GMT + 9):
IN BRIEF - Lerøy Seafood Group ASA : Final result of mandatory offer in Havfisk ASA
Oct 20, 22:00 (GMT + 9):
IN BRIEF - Fish parasites may prevent human intake of heavy metals – study
United States
Oct 20, 22:00 (GMT + 9):
IN BRIEF - Industry Leaders Explore Future of the Digital Ocean at WOC SOS
United Kingdom
Oct 20, 22:00 (GMT + 9):
IN BRIEF - Marine Stewardship Council ranks among top 11 ecolabels in the Netherlands
United Kingdom
Oct 20, 22:00 (GMT + 9):
IN BRIEF - Good news for Scottish mackerel fishers following quota agreement for 2017
Oct 20, 21:30 (GMT + 9):
Albacore fishery permanent closure set
South Africa
Oct 20, 02:40 (GMT + 9):
Southern bluefin tuna quota increase raises controversy

Plankton shows oceans are responding to climate change
New Zealand Victoria University of Wellington scientists have concluded that the appearance of plankton white blooms in the eastern area of New Zealand suggests the ocean is responding to climate change.
Relief about EU’s decision not to ban American lobster exports
Canada The European Commission informed Sweden it will not propose American lobster (Homarus americanus) be listed as invasive but it will instead pursue measures less likely to disrupt trade.
The EU proposes global deal to limit fisheries subsidies
European Union The EU proposes to curb subsidies causing overfishing in WTO countries, but its proposal foresees flexibility for developing countries and takes account of the needs of fishing communities in least developed and developing countries.
Fish sauce reported to contain excessive arsenic
Viet Nam A study performed by the Vietnam Standards and Consumers Association determined that nearly 70 per cent of fish sauce samples taken contains excessive amounts of arsenic.
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
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2016 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER