>
 
> FishingBoating-World.com
 
 
News Home Newsletters Powerboat-World Australian Cruising World Cruising MarineBusiness-World Animated Knots Video Gallery
MarineBusiness-World Photo Gallery
Sail-World.com : Commercial fishing, climate change causing fish to shrink
Commercial fishing, climate change causing fish to shrink

'Silver Warehou'    . ©
A new study by Australia's peak scientific body the CSIRO shows that fish around the world are shrinking in size.
Commercial fishing and climate change are believed to be the main culprits behind the decrease, but CSIRO scientists say the shrinking size is also leading to a drop in fish populations, with smaller fish more susceptible to predators.


Marine biologist, Dr Asta Audzijonyte of the CSIRO's Wealth from Oceans Flagship, and colleagues, reported their findings in the journal Royal Society Biology Letters.

Dr Audzijonyte says commercial fishing could be changing the long-term evolution of fish sizes.

She found that even small decreases in the body size of some fish species had a big impact on their population size, because it made fish more vulnerable to predators.

'So basically, if the flathead gets a bit smaller, it's being eaten more heavily by other fishes like barracuda, which is the predator of the flathead,' she explained.
The CSIRO study looked at five Australian fish species: Tiger flatheads, jackass morwong, silver warehou, blue grenadier and pink ling.

'We usually selectively catch the largest and the fastest-growing individuals, leaving the small ones in the ocean. So we only have the small ones left ... But then also, only the small ones get a chance to reproduce, and they are more likely to produce other small and slow-growing fish.

'So in this way, we are getting a long-term evolutionary decline in body size, which is more problematic because the fish will not get bigger quickly, even if we completely stop fishing, because they already became evolutionarily smaller.'

The scientists used a complex modelling system to test how the decreasing fish size affects the interactions between different species.

More at http://www.csiro.au/en/Organisation-Structure/Divisions/Marine--Atmospheric-Research.aspx


by CSIRO

  

Click on the FB Like link to post this story to your FB wall

http://www.fishingboating-world.com/index.cfm?nid=106296

1:51 AM Tue 5 Feb 2013GMT


Click here for printer friendly version
Click here to send us feedback or comments about this story.







FishingBoating-World





Pontoon Boats are a hit with families and entertainers by Sanctuary Cove International Boat Show,
















Glacier Bay returns to Australia, re-launching at SCIBS by Sanctuary Cove International Boat Show,
















Power to the people at Sanctuary Cove International Boat Show by Sanctuary Cove International Boat Show,






























Humpback Whales - Non Lethal research
VRFish works with fishers on Corio Bay conflict
Changed boating conditions for ski race on Clarence River
VRFish calls for action on Anglesea River
Submit your entry to the BoatUS Angler 'Catch of the Month' contest
Channel 7 stage returns to Sanctuary Cove International Boat Show
Brisbane Tinnie & Tackle Show - this weekend!
Coastal infrastructure and species loss - Climate Change consequences *Feature
rescueME PLB1 – safety assured in one compact, light package *Feature
Japan's Antarctic whaling program harpooned
All Marine Spares hits the boat show trail in a trailer *Feature
Macquarie perch stocked into three northern Victorian waters
Local council celebrates commitment to protect the Great Barrier Reef
Go crazy about whales in a special family fun day at the museum
New generation trawler boats - tradition with a twist
Arvor releases new Sportsfish range
AIMEX focuses on commercial show in Asia
Further Australian growth for Stabicraft
Southport Yacht Club will host a free 'Discover Sailing Day'
Melbourne Boat Show earlier this year - 12 to 16 June
FinScan digital switching fitted to new rescue vessels   
Kids' Zone a drawcard at Brisbane Tinnie & Tackle Show   
Brisbane Tinnie & Tackle welcomes Engel as stage sponsor   
BIAV appoints new GM   
Jet stream gets fish in hot water   
Trash to Treasure - A seafood story   
Big waves shown to be energetically costly for fish   
Fisherman nabbed for illegal fishing at Point Lonsdale   
Maritime Alert - Dangerous conditions forecast for NSW boaters   
World Recreational Fishing Conference - First call for papers open   
12 weeks til Melbourne Boat Show   
First deadline for SCIBS exhibitors looms March 24   
Fishing for Culture - A celebration of fishing in culture   
Improving fish habitat by building a fishing line recycling bin +Video   
Greater numbers of catchable King George whiting in the years to come   
Paul Burt, boating guru, is the face of Sanctuary Cove Boat Show   
Marine Industry loses a loyal servant: Vale Gunter Bruckner   
Positive pass mark for new venue   
Couran Cove signs lease deal with Hope Island Marina   
Phones outpace PCs and TV as preferred device   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png http://www.sail-world.com/event_images/image/FaceBook-icon.png  http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL NEW FBW