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


Fish infected with parasitic worms. (Photo: University of Leicester)

Global warming benefits parasites, disadvantages fish: study

Click on the flag for more information about United Kingdom UNITED KINGDOM
Tuesday, December 06, 2011, 04:20 (GMT + 9)

Scientists from the University of Leicester’s Department of Biology have found that higher water temperatures allow parasitic worms that infect fish to grow four times faster and influence the fish to prefer warmer temperatures. This study is one of the first to prove that global warming affects how parasites and their hosts interact.

The results, supported by funding from the Biotechnology and Biological Sciences Research Council (BBSRC) and the Centre for Environment, Fisheries and Aquaculture Science (Cefas), were published in the journal Global Change Biology.

The researchers saw behavioural changes in infected fish, suggesting that parasites may manipulate host behaviour to make them move to warmer temperatures, where the host's growth rate slowed.

"What we witnessed was that fish infected with the largest worms showed a preference for warmer water, suggesting that these parasites also manipulate the behaviour of host fish in ways that benefit the parasites by maximizing their growth rates," said Dr Iain Barber, who carried out the study with doctoral student Vicki Macnab.

Macnab noted that the size these parasites attain in their fish hosts determines how severely fish reproduction is affected, such that, according to the study, parasites will have a more serious effect on fish reproduction if temperatures rise.

"This research shows that global warming could shift the balance between parasites and their hosts with potentially serious implications for fish populations," she stated.

Parasitic worms infecting stickleback fish grew four times faster in waters of 20 °C compared to 15 °C, and the fish grew more slowly, suggesting that fish parasites handle higher temperatures much better than the fish they infect.

"The results are important because the size these parasites attain in their fish hosts also determines their infectivity to fish-eating birds like kingfishers and herons – the next hosts in the parasite's life cycle – and also the number of parasite eggs that they will go on to produce. Bigger larval parasites in the fish go on to become larger adult worms in birds, which produce more eggs,” Barber said.

Barber pointed out that after the eight weeks of the study, all of the worms held at 20 °C were mature enough to infect fish-eating birds, whereas none of those held at 15 °C had reached that size.

Moreover, a follow-up study showed that fish infected with the largest worms showed a preference for warmer water -- suggesting that these parasites also maneuver the behaviour of host fish to benefit the parasites and maximize their growth rates.

The results provide some of the first evidence that increasing environmental temperatures can accelerate the speed at which parasites complete their life cycles, which could lead to a higher overall level of parasitism in natural animal populations.

By Natalia Real
editorial@fis.com
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
Netherlands
Jul 23, 05:10 (GMT + 9):
IN BRIEF - Dutch unions go to court over pre-packed shrimp firm bankruptcy
United Kingdom
Jul 23, 05:10 (GMT + 9):
IN BRIEF - Fishing safety moves forward
Viet Nam
Jul 23, 05:10 (GMT + 9):
IN BRIEF - Khanh Hoa to become Vietnam’s major tuna trading center
South Korea
Jul 23, 05:10 (GMT + 9):
IN BRIEF - Dongwon seeks growth with dried seaweed
Viet Nam
Jul 23, 05:00 (GMT + 9):
IN BRIEF - Minh Phu – Hau Giang Seafood Corp recognized as prioritized enteprise
Japan
Jul 23, 05:00 (GMT + 9):
IN BRIEF - Japan Presses Korea to End Seafood Import Ban
Thailand
Jul 23, 05:00 (GMT + 9):
IN BRIEF - Thai agencies revising labour law to deal with human trafficking
Brazil
Jul 23, 03:40 (GMT + 9):
Genetically improved tilapia delivered to Ivory Coast
Japan
Jul 23, 03:10 (GMT + 9):
Toyota Tsusho and Kinki University intend to enhance bluefin tuna farming
European Union
Jul 23, 02:30 (GMT + 9):
IATTC fails to improve tuna and shark conservation
Norway
Jul 23, 01:30 (GMT + 9):
IN BRIEF - Cermaq ASA : Correction - Cermaq Q2 report
United States
Jul 23, 01:30 (GMT + 9):
IN BRIEF - Collaboration To Benefit Small-Scale Shrimp Farmers
Peru
Jul 23, 00:50 (GMT + 9):
Over 2,600 tonnes of juvenile anchovy seized from industrial vessels
United Kingdom
Jul 22, 23:50 (GMT + 9):
Microplastics worse for marine creatures than previously thought
Argentina
Jul 22, 23:20 (GMT + 9):
Squid and shrimp absent in cooperation agreements with China



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Codex once again discusses biotoxin standards in bivalve molluscs
Chile The Chilean government managed to have the proposed performance criteria for identification methods of marine biotoxins in live and raw bivalve molluscs once again discussed at the general meeting of the Codex Alimentarius, held in Geneva, Switzerland.
Concern over US tuna fleet losing access to Pacific fisheries
United States American treaty negotiations with the Pacific Island Nations came to an end on Saturday in Auckland, New Zealand, with a “No Deal” conclusion, leaving the US tuna Fleet without fishing access to the Pacific Ocean in 2015.
EPA intends to protect salmon fisheries from Pebble Mine
United States The US Environmental Protection Agency proposes restrictions on a massive gold-and-copper prospect development near the headwaters of the world’s most valuable salmon fisheries, in Bristol Bay, Alaska.
Squid skin protein can boost bioelectronics
United States A team of researchers has discovered that reflectin, a protein in the skin of the common pencil squid (Loliginidae) can conduct positive electrical charges, or protons, making it a promising material for building biologically inspired devices.
 
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 International Fisheries Corp. - 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-
Grupo Calvo - Luis Calvo Sanz, S.A. (Group 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
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 - 2014 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER