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
editorial@fis.com
www.fis.com

 


 Print


Click to know how to advertise in FIS
MORE NEWS
Canada
Aug 27, 05:10 (GMT + 9):
IN BRIEF - Closed Area For Shellfish Harvesting Mid North Shore
New Zealand
Aug 27, 05:10 (GMT + 9):
IN BRIEF - NZ Navy and Fisheries sting finds large proportion of tuna boats breaching the rules
Norway
Aug 27, 05:00 (GMT + 9):
IN BRIEF - Leroey says acquisition of Havfisk and Norway Seafoods is approved
United Kingdom
Aug 27, 05:00 (GMT + 9):
IN BRIEF - Minneapolis sees rise in foodborne illness from norovirus, Vibrio bacteria found in oysters
United Kingdom
Aug 27, 05:00 (GMT + 9):
IN BRIEF - Nomad Foods Seeking Further Acquisitions Despite Challenging Market Conditions Impacting Sales
Gambia
Aug 27, 04:00 (GMT + 9):
IN BRIEF - FAO, Fisheries Sign Agreement to Enhance Aquaculture Employability
Kuwait
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Ministry of Commerce monitoring fish prices
Canada
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Vale pleads guilty to discharging waste harmful to fish in Labrador
Viet Nam
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Vietnam’s seafood industry feels the pinch after mass fish deaths
United States
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Benefits and risks of fish consumption provided by new app
United States
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Scientists looking to understand future ocean acidification effects on commercial fishing
Viet Nam
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Toxic metals detected in Hà Tĩnh seafood samples
United Kingdom
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Revealed: Plastic is found in a THIRD of fish caught in Britain because of toxic microbeads
Viet Nam
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Việt Nam looks forward to EVFTA benefits
United States
Aug 27, 04:00 (GMT + 9):
IN BRIEF - Alaska's pink salmon record broken twice in 2-day span on Kenai River



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Foodservice companies fail to offer sustainable seafood, Greenpeace states
United States A Greenpeace report denounces that some of the largest US foodservice companies are failing to provide consumers with seafood that meets basic standards for sustainability and social responsibility.
Omega-3 injection may reduce stroke-like brain damage
United States A team of researchers from Columbia University Medical Center (CUMC) has concluded that omega-3 fatty acids found in oils extracted from cold-water fish may reduce brain damage.
Study predicts alarming krill drop by end of the century
United States Antarctic krill (Euphausia superba) habitat is undergoing a continuous deterioration process, which could lead to a reduction of up to 80 per cent by the end of the century.
Bumble Bee tuna cans to include Non-GMO logo
United States Leading seafood brand Bumble Bee has decided to carry out multiple product innovations in its product portfolio, including a Non-GMO Project Verified wild caught tuna now made with sea salt, plus expanded seafood traceability.
 
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
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

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