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


OSU post-doctoral researcher Mark Christie was amazed at the changes. (Photo: oregonstate.edu)

Hatchery-raised fish less fruitful in the wild: study

Click on the flag for more information about United States UNITED STATES
Wednesday, December 21, 2011, 15:40 (GMT + 9)

A study has found that in just one generation salmonid traits are selected allowing the fish to survive and thrive in the hatchery environment. However, this compromises the salmon’s ability to spawn in the wild, meaning that hatchery-raised fish may not be able to help increase wild stocks.

The findings, published this week in Proceedings of the National Academy of Sciences, confirmed that it is a change in fish genetics not a temporary environmental effect; it is a primary impact of hatcheries.

“We’ve known for some time that hatchery-born fish are less successful at survival and reproduction in the wild,” said Michael Blouin, a professor of zoology at Oregon State University.

“However, until now, it wasn’t clear why. What this study shows is that intense evolutionary pressures in the hatchery rapidly select for fish that excel there, at the expense of their reproductive success in the wild,” he stated.

This and other studies continue to note concerns regarding the genetic impacts that hatchery fish may have when they interbreed with wild salmon and steelhead and whether they will help replenish wild salmonid stocks.

This study used a 19-year genetic analysis of steelhead in Oregon’s Hood River to analyse why hatchery fish struggle to reproduce in wild river conditions. Some of the possible causes explored were environmental effects of captive rearing, inbreeding among close relatives and unintentional “domestication selection” – the latter of which was confirmed to be occurring.

When thousands of smolts are born in the artificial environment of a hatchery, those that prosper are the ones that can handle hatchery conditions. But these same traits can backfire in the wild, as their ability to produce surviving offspring is much reduced.

“We expected to see some of these changes after multiple generations,” said Mark Christie, an OSU post-doctoral research associate and lead author on the study. “To see these changes happen in a single generation was amazing.”

One of the dominating traits is the ability to tolerate extreme crowding. Scientists said that if they can determine exactly what aspect of hatchery operations is selecting for fish with less fitness in the wild, it could be possible to help address the problem.

Billions of captive-reared salmon are released into the wild each year to boost fishery yields and populations. The recovery plan of steelhead studied in this research, which are listed as threatened under the Endangered Species Act, includes supplementation with hatchery fish.

“It remains to be seen whether results from this one study on steelhead generalize to other hatcheries or salmon species,” Blouin said.

“Nevertheless, this shows that hatcheries can produce fish that are genetically different from wild fish, and that it can happen extraordinarily fast,” he said. “The challenge now is to identify the traits under selection to see if we can slow that rate of domestication.”

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


 Print


Click to know how to advertise in FIS
MORE NEWS
Italy
Oct 16, 05:00 (GMT + 9):
IFFO’s Annual Conference features high level panel and the EU commission
Viet Nam
Oct 16, 01:20 (GMT + 9):
Vietnamese shrimp exports generate USD 1,900 million until July
Netherlands
Oct 15, 23:30 (GMT + 9):
Profish and Heiploeg perform strategic alliance
Mexico
Oct 15, 23:00 (GMT + 9):
Shrimp farms in Sinaloa lose USD 7.9 million due to rain and water discharge
Norway
Oct 15, 22:00 (GMT + 9):
Cod breeding progress could lead to profitable farming
Norway
Oct 15, 21:20 (GMT + 9):
Plant-based salmon feed commercial production assessed
Chile
Oct 15, 20:50 (GMT + 9):
Camanchaca plans to invest USD 23 million to expand its operations in Coronel
European Union
Oct 15, 20:10 (GMT + 9):
EU fisheries ministers to discuss Baltic Sea fishing proposal
United States
Oct 13, 07:00 (GMT + 9):
IN BRIEF - Sea change coming for aquaculture in Canada
Canada
Oct 13, 07:00 (GMT + 9):
IN BRIEF - White Dog Labs announces first production plant for its aquaculture feed ingredient, ProTyton™
United States
Oct 13, 07:00 (GMT + 9):
IN BRIEF - One decision for fisheries viability
United States
Oct 13, 07:00 (GMT + 9):
IN BRIEF - Importance of baitfish to fisheries and food chains
United Kingdom
Oct 13, 07:00 (GMT + 9):
IN BRIEF - Aquaculture Pilot Program Keys In On Washburn Island, Great Pond
European Union
Oct 13, 07:00 (GMT + 9):
IN BRIEF - Commission recruits fisheries experts
South Africa
Oct 13, 02:10 (GMT + 9):
Fisheries department to appeal rock lobster quota ruling



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Undocumented workers in Louisiana's seafood industry struggle against labour abuse
United States Louisiana's undocumented seafood workers have decided to join efforts to combat work´place abuse in a USD 2 billion-a-year industry.
Fisheries department to appeal rock lobster quota ruling
South Africa The Department of Agriculture, Forestry and Fisheries is considering to appeal a court ruling on fishing quotas in favour of the WWF’s application for the department to reduce the quota.
Albacore fishery reopened
Spain The Ministry of Agriculture, Fisheries and Food has authorized the reopening of the fishery for albacore tuna (Thunnus alalunga) in the Atlantic Ocean from 00:00 on October 11 thanks to an exchange of quotas with Portugal.
EU fisheries ministers to discuss Baltic Sea fishing proposal
European Union EU Fisheries ministers are meeting at the Fisheries and Agriculture Council in Luxembourg to discuss the Commission's proposal on the Baltic Sea fishing opportunities for 2019 and reach a political agreement.
 
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
Sea Harvest Corporation (PTY) Ltd. - Group Headquarters
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.
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  - Group Headquarters
Greenpeace International - The Netherlands | Headquarters
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
NOREBO Group (former Ocean Trawlers Group)
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 - 2018 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER