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


Biologist Beatriz Diaz Pauli catching guppies. (Photo: Kim E. Andreassen,uib.no)

Novel experiment investigates overfishing's effects on fish development

Click on the flag for more information about Norway NORWAY
Tuesday, September 20, 2011, 23:40 (GMT + 9)

Does overfishing change the behaviour and development pattern of fish? Scientists are trying to find out.

Researchers have already established that overfishing selects for smaller fish. Now, a team of scientists will take away the largest fish from populations of lab-raised guppies to investigate the impact, wrote BBC News’s science reporter Jennifer Carpenter.

The team is now reporting at the meeting of the European Society for Evolutionary Biology in Germany.

"There are clear indications that almost all... commercial fish are shrinking," commented marine biologist Carl Lundin, who directs the International Union for the Conservation of Nature's (IUCN) Global Marine and Polar Programme.

Both stocks and the fishing industry benefit from larger fish: for mass spawning species such as cod, older larger females are beneficial, as they are the best at replenishing the population. And larger fish, Lundin said, are advantageous for fishers.

In addition, industrial fishing may have another effect: earlier reproduction in fish.

Male guppy. (Photo: EvoFish)

To investigate additional upcoming changes in marine life, evolutionary biologist Beatriz Diaz Pauli and her team from the University of Norway have established nine populations of guppies of 500 to 900 individuals each.

In the next few years, Diaz will remove all the fish longer than 16mm from three of the tanks. In the rest, she will eliminate those shorter than 16mm or randomly, which will serve as a control for what results from altering the density of fish in the tanks.

Shifts in the fish's growth rate, age and size of maturation, reproductive effort and mating and feeding behaviours will be documented.

The goal is to discern if the changes result from fish adapting to a new environment, called a plastic response, or from genetic changes.

It is of note that plastic responses are not inherited.

While a fish might grow smaller if fed little food as a juvenile (a plastic response), its young would be able to grow large if fed sufficiently. But genetic responses are inherited, such that even if a future generation receives abundant food, its size would remain small.

The team hopes its findings regarding the nature of the changes in fish will help explain how stocks could recuperate if overfishing stopped or spawning grounds were safeguarded.

"If we set aside 20-30 per cent of the habitat where reproduction... of key commercial fish stocks [occurs], we are much more likely to avoid these types of problems," said Lundin.

Related articles:

-
Atlantic fish species already shifting due to warming waters 
-
National fisheries rebuilding showing progress: report 

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


 Print


Click to know how to advertise in FIS
MORE NEWS
New Zealand
Sep 3, 03:10 (GMT + 9):
Paua and crayfish black market busted
United States
Sep 3, 02:50 (GMT + 9):
IN BRIEF - Hawaii's longline fleet dodges hurricanes
Bangladesh
Sep 3, 02:50 (GMT + 9):
IN BRIEF - Imported fishes found substandard, harmful
Somalia
Sep 3, 02:50 (GMT + 9):
IN BRIEF - Mayor vows to relentlessly fight against illegal fishing trawlers
Spain
Sep 3, 02:40 (GMT + 9):
Pescanova’s minority shareholders propose alternative agreement
United States
Sep 3, 02:20 (GMT + 9):
IN BRIEF - Guide helps figure safe level of fish to eat in Wisconsin
Canada
Sep 3, 02:20 (GMT + 9):
IN BRIEF - Fish habitat protection waning under Harper government, analysis finds
Faroe Islands
Sep 3, 02:20 (GMT + 9):
IN BRIEF - Go fish for 800% return on Faroe
United States
Sep 3, 02:20 (GMT + 9):
IN BRIEF - Southeast pink salmon harvest fails to meet predictions
New Zealand
Sep 3, 02:20 (GMT + 9):
IN BRIEF - SeaDragon Chair, CEO and CFO to invest up to NZD 300,000
United States
Sep 3, 02:20 (GMT + 9):
US and Russia join efforts against IUU fishing in the Arctic
Australia
Sep 3, 02:00 (GMT + 9):
IN BRIEF - Fish grown in sea cages set to be harvested in Marshall Islands
Iran
Sep 3, 02:00 (GMT + 9):
IN BRIEF - Iran's annual seafood exports predicted at IRR 350 million
New Zealand
Sep 3, 02:00 (GMT + 9):
IN BRIEF - MPI closes down black market fishing operations
Argentina
Sep 3, 01:30 (GMT + 9):
Spanish shipyard interested in building modern research vessel



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Climate change will alter global marine communities
United Kingdom Tropical marine animals that currently thrive in warm habitats around the equator will have to spread north and south to avoid extinction as global sea temperatures rise, a study has found.
Cornish Fishermen take steps towards EU spurdog management change
United Kingdom Cornish fishermen expressed concern about the fact that while there has been an increasing number of sporadic but significant hauls of spurdog (Squalus acanthias), no landing of the species has been allowed by the European Union since 2010.
NGO accuses Coles of breaching its own tuna sustainable policy
Australia Greenpeace accuses supermarket giant Coles of breaching its own sustainable tuna policy by selling home brand cans of yellowfin tuna even when the retail acknowledges this resource is overfished.
Sanford gets rid of its tuna fleet
New Zealand Fishing company Sanford has sold one of its Pacific tuna vessels and intends to sell its other purse seiner and quit its Pacific tuna business due to certain challenges in the sector.
 
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
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2015 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER