sail-world.com
 
 
News Home Boats for Sale MarineBusiness-World Sail-World Racing Cruising Int Magnetic Is RW Photo Gallery FishingBoating
Sail-World.com : Baby Nemos finding their way home
Baby Nemos finding their way home

'Baby Nemos finding their way home.'    ARC Centre of Excellence Coral Reef Studies ©    Click Here to view large photo

Fish larvae on the Great Barrier Reef can find their way home after weeks of drifting in the sea even where the currents are strong, thanks to their senses of smell and hearing, two James Cook University researchers have found.
JCU Professors Eric Wolanski and Mike Kingsford published their findings in their paper, Oceanographic and behavioural assumptions in models of the fate of coral and coral reef fish larvae.

The paper has been published in the Journal of the Royal Society Interface, a journal that aims to link physics and biology.

Professor Wolanski, from TropWater and the School of Marine and Tropical Biology, said fish larvae showed they used the two senses to find their way home.

'Knowing that these larvae can orientate and swim to reefs using the senses of smell and hearing, we demonstrated with modelling that 20 per cent of these actively swimming fish larvae can return,' he said.

'This is compared to less than two per cent for passively drifting coral larvae.

'Importantly, many more fish larvae end up on other reefs nearby and replenish fish stocks in fished areas. This means that the marine protected areas help resupply fish to fished reefs outside marine protected areas.'

Professor Wolanski explained that after hatching, fish larvae cannot swim and are dispersed by ocean currents.
However, when the larvae have grown a dorsal bone, they can swim.

'They have a well-developed sense of smell, as revealed by experiments, and they swim horizontally using the smell cue towards home, that is, the reef where they were spawned,' he said.

'The fish larvae can also hear, and experiments have shown that they also swim to the sounds of life on the reef.'
Professor Wolanski said it was important that they return to their natal (or home) reef.

'If they don’t, the population will die because initially the fish larvae are moved away by the currents from their natal reefs. To maintain the population, some larvae must come back.'

The findings came after researchers developed a predictive model to find out what the fish and coral larvae were doing.
'The two senses can maximise the chances that they come back to the natal reef – the smell makes them come back in the general direction and, when they get close enough, the sound gives them a precise bearing,' he said.

'However for those larvae that have drifted too far away from the natal reef and can’t come back, they are not
necessarily going to be lost at sea and die.

If they come within hearing distance – one to two kilometres – of another reef, they can swim to it. This is how MPAs help replenish fish in fished areas.'

Professor Wolanski said importantly, the study demonstrated the usefulness of marine protected areas.

'It shows that a large number of coral reef fish larvae from an MPA are dispersed away by oceanic currents, but these larvae are not necessarily lost at sea and bound to die; using sound, these larvae can recruit in large numbers to reefs outside of the MPAs. In other words, MPAs help replenish fish stocks in fished areas.'


by ARC Centre of Excellence Coral Reef Studies


  

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

http://www.sail-world.com/index.cfm?nid=124414

7:39 AM Sun 13 Jul 2014GMT


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







Sail-World Cruising News - local and the World





Canal Boating in the Alsace with the Galley Guys by Greg Nicoll with John Armstrong,




World ARC fleet arrives in Darwin by World Cruising Club,






Dangers of the Dinghy trip back to your boat by Rob Kothe & the Sail-World Team,






Where in the world are our strongest corals? by Hanny Rivera - Cohen's Lab,






Barnacle Busting by Neil and Ley Langford,




Polar research: Six priorities for Antarctic science by Mahlon C. Kennicutt II and colleagues,




































Risks to penguin populations continues
Dangerous conditions for boaters from this afternoon
ARC Baltic fleet head from Helsinki to Stockholm
Follow these tips when anchoring
Swedish couple rescued off Cook Islands
Elaine Fowler, RPAYC's first female life member elected
Refurbished Protector project 'better than buying new'
Galley Guys meet the Spice Lady
Discover science of maritime exploration at National Maritime Museum
Royal Prince Alfred Yacht Club’s Jack Gale training centre born
Multihull Central launches Aquila range at SIBS *Feature
If all else fails read the instructions!!
ARC Baltic fleet cruising and anchoring in the Finnish archipelago
Phuket Yacht Show: new kid on the block taking on PIMEX? *Feature
Endangered species are like Movie Stars - Charlie Sheens and Tom Hanks
Vanuatu Customs making life easier for visiting cruising yachts
Multihull Central - Covering all the bases *Feature
Baltic 4 Nations rally is now in full swing
Flags at Sea, an infographic by John Tissott
Cruising lessons from ocean racers
Sydney International Boat Show - Day 2 *Feature   
Marine Rescue volunteers celebrate new unit and $120,000 vessel   
Procedures set out for waterborne visitors to Vanuatu   
17-year-old RNLI volunteer saves child in first rescue mission + Video   
Teen names latest RNLI Shannon class lifeboat in Poole + Video   
Fascinating opportunity with OceansWatch   
Pantaenius Insurance - being seen in yellow, green and orange *Feature   
Fake GPS signals detected when cruising the high seas   
Sydney International Boat Show - Changed conditions on Sydney Harbour   
Our new Cruising Editor editor remembers his first offshore adventure   
World Odyssey Race - Bringing back the Corinthian spirit   
Blue Planet Odyssey Rally - Raising climate change awareness   
Pacific Circuit Rally - 2015   
All Points Rally departs this November   
Gold Coast Broadwater no closer to welcoming supermaxis *Feature   
2014 Magnetic Island Race Week Cruising North - One for Poppy? *Feature   
World ARC 2014 reaches Australia   
A Mooring in Iceberg Alley   
Marine Rescue volunteers called to rescue out of fuel vessel updates   
Marine Rescue volunteers called to rescue second vessel out of fuel   


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 Cru SH
LocalAds   DE  ES  FR  IT