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
United Kingdom
Jun 25, 05:00 (GMT + 9):
IN BRIEF - SFF comment on referendum vote to leave the EU
United States
Jun 25, 05:00 (GMT + 9):
IN BRIEF - Personal care products cause damage to Coral Reefs
European Union
Jun 25, 05:00 (GMT + 9):
IN BRIEF - WWF: Brexit brings risks for UK environment and leaves EU weaker
Viet Nam
Jun 25, 05:00 (GMT + 9):
IN BRIEF - Facility allegedly responsible for farm-raised fish deaths in southern Vietnam
United States
Jun 25, 05:00 (GMT + 9):
IN BRIEF - Renowned Marine Biologist Asha de Vos Joins Oceana
India
Jun 25, 04:00 (GMT + 9):
IN BRIEF - Illegal fishing, land grabbing by outsiders add to Tamil fishermen's woes
Myanmar
Jun 25, 04:00 (GMT + 9):
IN BRIEF - Fish farming rules needed to protect biodiversity
Canada
Jun 25, 04:00 (GMT + 9):
IN BRIEF - LeBlanc: LIFO northern shrimp decision coming soon
Netherlands
Jun 25, 02:30 (GMT + 9):
First ambitious ocean-cleansing project presented
Spain
Jun 25, 02:20 (GMT + 9):
Grant regulation approved for market development and seafood promotion campaigns
United Kingdom
Jun 25, 01:20 (GMT + 9):
Brexit victory causes bitter-sweet reactions
European Union
Jun 24, 23:50 (GMT + 9):
EP adopts Baltic pluriannual fisheries plan
Chile
Jun 24, 23:50 (GMT + 9):
Electronic certification for salmon exports to Russia enters final stage
United States
Jun 24, 23:40 (GMT + 9):
Shellfish contagious cancer spread discovered
Australia
Jun 24, 22:40 (GMT + 9):
MSC certifies first recreational and commercial fishery worldwide



Lenguaje
FEATURED EVENTS
  
TOP STORIES
American authorities demand the EU to continue importing their lobsters
United States Maine politicians are calling for the EU to deny a request from the Swedish government to have American lobster listed as invasive.
EJF questions Thailand’s progress on human trafficking in fisheries
Thailand Non-government organisation EJF considers that the Royal Thai Government has not achieved substantial progress in eliminating severe forms of trafficking compared to the previous year.
Good shrimp landings in May but with low prices
United States The latest statistics on shrimp landings in the Gulf of Mexico published by NOAA indicate that in May 10.3 million pounds of the crustacean were landed, 26.9 per cent below the prior fourteen-year historical average.
Taiwan to contribute to tilapia farming in floating cages
Honduras The governments of the Republic of China (Taiwan) and Honduras have signed a memorandum of understanding to implement tilapia farming project in floating cages installed on the Gulf of Fonseca.
 
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