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

Researcher Tom Reimchen states the trout adipose fin acts as a mechano-sensory organ. (Photo: web.uvic.ca/GNU License)

Hatchery salmon disadvantaged by fin clipping: study

Click on the flag for more information about Canada CANADA
Wednesday, July 13, 2011, 16:40 (GMT + 9)

A new study suggests that the common practice of clipping the adipose fin of hatchery salmon may be damaging their swimming ability and survival rate. The adipose fin, found on a fish’s back behind its dorsal fin, was until now considered vestigial rather than functional and is typically cut off from millions of hatchery fish for identification purposes when they are caught. 

But it turns out the practice is harming fish more than previously thought, according to a study co-authored by University of Victoria biologist Tom Reimchen and published recently in Proceedings of the Royal Society. 

The study shows advanced microscopic techniques which reveal that adipose fins in brown trout, which belongs to the salmon family, hold a network of nerves linked with star-shaped cells similar to those in the brain. 

“This strongly suggests that the fin acts as a mechano-sensory organ that relays positional information to the fish,” said Reimchen.

He noted that this is particularly vital when the fish is traversing turbulent waters, as the adipose fin plays an important role in the fish’s swimming abilities. In the past, Reimchen had found that removing the small fin forced the fish to use more energy to keep up speed and position, which would likely put the fish at a disadvantage in the ocean, where salmon brave survival challenges ranging from climate change to predators.

The researchers found that the adipose fin acts like a complex feeling device, allowing the fish to detect water flow and make up for it as necessary, reports The Globe and Mail.

“While the removal of the adipose fin may be less damaging than the removal of any other fin, our results suggest that we should be rethinking the removal of a vital sensory device, especially when these fish are already subjected to considerable demographic and environmental stresses,” Reimchen continued.

"The practical issue emerging from our study is: what is the result of the increased loss of their swimming ability and their reduced competitive performance and do they come back at a lower rate than fish with an adipose fin?" he asked, reports The Times Colonist.

The adipose fins serve as markers when the fish is caught. The data is then sent to the Department of Fisheries and Oceans Canada (DFO) to help it gauge stock assessment and trends in salmon abundance and survival.

By Natalia Real



Click to know how to advertise in FIS
United States
Oct 13, 03:00 (GMT + 9):
IN BRIEF - What are the Risks of Using Insects as Food or Feed?
United States
Oct 13, 03:00 (GMT + 9):
IN BRIEF - Alaska Fish Factor: Is Alaskan Pollock Really Alaskan Pollock?
Oct 13, 03:00 (GMT + 9):
IN BRIEF - FAO Responsible Fisheries Code Celebrates 20-Year Anniversary
United States
Oct 13, 03:00 (GMT + 9):
IN BRIEF - Urban Runoff Harming Coho Salmon is Preventable
United States
Oct 13, 03:00 (GMT + 9):
NOAA declares global coral bleaching event
Oct 13, 02:20 (GMT + 9):
Navigation safety boosted in South China Sea
Oct 13, 01:20 (GMT + 9):
FAO’s initiatives granted support of international aquaculture sector
Oct 13, 01:00 (GMT + 9):
IN BRIEF - Partners commit to support all GSSI recognized certification schemes
Oct 13, 00:30 (GMT + 9):
Scientists and entrepreneurs develop project to make food from kelp
Oct 12, 22:50 (GMT + 9):
Sustainable fisheries becomes focus of summit in Vigo
Oct 12, 22:20 (GMT + 9):
Partners commit to support all GSSI recognized certification schemes
United Kingdom
Oct 12, 01:30 (GMT + 9):
Orkney crab to gain protected status
Oct 12, 00:40 (GMT + 9):
Clearwater intends to expand business by purchasing Macduff
Oct 10, 00:10 (GMT + 9):
IN BRIEF - Shrimp industry's woes see no end
United States
Oct 10, 00:00 (GMT + 9):
IN BRIEF - More Transparent Than Ever

Cargill completes Ewos acquisition
Norway Cargill has completed the acquisition of Ewos, a global leader in salmon nutrition, for EUR 1.35 billion.
Shrimp production drop could affect seafood exports
India It is likely that India’s total seafood exports decline 10 per cent-20 per cent this year due to the impact of a lower shrimp production.
King crabs may threaten Antarctic ecosystem
United States King crabs may soon become high-level predators in Antarctic marine ecosystems where they haven’t played a role in tens of millions of years, according to a new study led by Florida Institute of Technology.
International fund invests EUR 20 million in fishing firm
Mauritania International direct investment fund Hermes-Sojitz will invest EUR 20 million in an important Mauritanian fishing firm specializing in fish production and processing in exchange for 23 per cent participation in its property.
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-
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 - 2015 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER