> Powerboat-World.com
 
 
News Home Video Gallery Newsletters Features FishingBoating MarineBusiness-World Sail-World Australia Australian Cruising
Photo Gallery

 

Sail-World.com : Rising CO2 levels making fish crazy!

Rising CO2 levels making fish crazy!

'Parrotfish Chlorurus enneacanthus - rising CO2 is impacting on nervous systems of fish.'    ARC Centre of Excellence Coral Reef Studies ©    Click Here to view large photo

The Earth's carbon dioxide emissions may be affecting the brains and central nervous system of sea fishes with serious consequences for their survival, an international scientific team has found.

Carbon dioxide concentrations predicted to occur in the ocean by the end of this century will interfere with fishes’ ability to hear, smell, turn and evade predators, says Professor Phillip Munday of the ARC Centre of Excellence for Coral Reef Studies and James Cook University.

'For several years our team have been testing the performance of baby coral fishes in sea water containing higher levels of dissolved CO2 – and it is now pretty clear that they sustain significant disruption to their central nervous system, which is likely to impair their chances of survival,' Prof Munday says.

In their latest paper, published in the journal 'Nature Climate Change', Prof Munday and colleagues report world-first evidence that high CO2 levels in sea water disrupts a key brain receptor in fish, causing marked changes in their behavior and sensory ability.

'We’ve found that elevated CO2 in the oceans can directly interfere with fish neurotransmitter functions, which poses a direct and previously unknown threat to sea life,' he says.

Prof Munday and his colleagues began by studying how baby clown and damsel fishes performed alongside their predators in CO2-enriched water. They found that, while the predators were somewhat affected, the baby fish suffered much higher rates of attrition.

'Our early work showed that the sense of smell of baby fish was harmed by higher CO2 in the water – meaning they found it harder to locate a reef to settle on or detect the warning smell of a predator fish. But we suspected there was much more to it than the loss of ability to smell.'

The team then examined whether fishes’ sense of hearing – used to locate and home in on reefs at night, and avoid them during the day – was affected. 'The answer is, yes it was. They were confused and no longer avoided reef sounds during the day. Being attracted to reefs during daylight would make them easy meat for predators.'

Other work showed the fish also tended to lose their natural instinct to turn left or right – an important factor in schooling behavior which also makes them more vulnerable, as lone fish are easily eaten by predators.

'All this led us to suspect it wasn’t simply damage to their individual senses that was going on – but rather, that higher levels of carbon dioxide were affecting their whole central nervous system.'

The team’s latest research shows that high CO2 directly stimulates a receptor in the fish brain called GABA-A, leading to a reversal in its normal function and over-excitement of certain nerve signals.

While most animals with brains have GABA-A receptors, the team considers the effects of elevated CO2 are likely to be most felt by those living in water, as they have lower blood CO2 levels normally. The main impact is likely to be felt by some crustaceans and by most fishes, especially those which use a lot of oxygen.

Prof Munday said that around 2.3 billion tons of human CO2 emissions dissolve into the world’s oceans every year, causing changes in the chemical environment of the water in which fish and other species live.

'We’ve now established it isn’t simply the acidification of the oceans that is causing disruption – as is the case with shellfish and plankton with chalky skeletons – but the actual dissolved CO2 itself is damaging the fishes’ nervous systems.'

The work shows that fish with high oxygen consumption are likely to be most affected, suggesting the effects of high CO2 may impair some species worse than others – possibly including important species targeted by the world’s fishing industries.

The team’s latest paper 'Near-future CO2 levels alter fish behavior by interfering with neurotransmitter function' by Göran E. Nilsson, Danielle L. Dixson, Paolo Domenici, Mark I. McCormick, Christina Sørensen, Sue-Ann Watson, and Philip L. Munday appears in the journal Nature Climate Change.

More at /www.coralcoe.org.au




by ARC Centre of Excellence for Coral Reef Studies

  

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

http://www.powerboat-world.com/index.cfm?nid=92935

12:27 PM Mon 16 Jan 2012 GMT






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


Power Boat News















Running on Pure Adrenalin by Sanctuary Cove International Boat Show,


Singapore Yacht Show – it’s a wrap. by Guy Nowell, Sail-World Asia, Hong Kong






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,








Singapore Yacht Show 2014. Boats to make your eyes pop. by Guy Nowell, Sail-World Asia, Singapore










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


SCIBS VIP lounge back bigger and better in 2014 by Sanctuary Cove International Boat Show,




Singapore Yacht Show 2014. And another thing… by Guy Nowell, Sail-World Asia, Singapore










UIM XCAT World Series - Lady Spain set for XCAT debut in Napoli
Cyclone Ita predicted to reach Category 4 off Far North Queensland
Charlotte Harbor Super Boat Grand Prix - 2014 Season Opener
Mercury’s new Verado 200hp Pro FourStroke – delivering even more
Stars emerge for Sydney International Boat Show *Feature
Living ship-shape on the 1.4km $10bn floating city
Hop online to get your fishing permit this Easter
Greg Norman announces global investor campaign for Great Keppel Island
Luxury Yacht Share Asia (LYSA) introduces fractional ownership to Asia
Humpback Whales - Non Lethal research
RYA Competent Crew Skills – Second edition now available
Mondo Marine invests in Chinese shipyard
Aqualuma partners with ASMEX 2014 for Welcome function
Kaohsiung to welcome the world for 1st Taiwan International Boat Show *Feature
Changed boating conditions for ski race on Clarence River
Royal Victoria Cup - Cable, Hockney and Shipley victorious
Channel 7 stage returns to Sanctuary Cove International Boat Show
Hainan Rendezvous: suffering from a hangover?
Palm Beach International Boat Show shows healthy attendance
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   
Royal Victoria Cup to take place this weekend   
Rowers and ferry masters encouraged to share waterways safely   
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   
Trash to Treasure - A seafood story   
Amazing Whales – Evolution and survival opens tomorrow   
Maritime Alert - Dangerous conditions forecast for NSW boaters   


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/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 WAS PBW