>
 
> FishingBoating-World.com
 
 
News Home Newsletters Photo Gallery Powerboat-World Australian Cruising World Cruising MarineBusiness-World Animated Knots
Video Gallery MarineBusiness-World
Sail-World.com : Freshwater Jellyfish discovered in Ireland
Freshwater Jellyfish discovered in Ireland


'Craspedacusta sowerbii'    Environment Protection Agency    Click Here to view large photo

One angler's disbelieving discovery in Ireland has led to a surprise new marine wildlife find for Ireland's inland waterways.

Pat Joyce, from Limerick, nearly fell off his fishing stand when, in early August, he spotted what looked like a single small jellyfish pulsing in the water in front of him.

The jellyfish disappeared and Joyce thought that perhaps he was mistaken since, as everyone knows, 'there is no such thing as a freshwater jellyfish'.

Two weeks later, again angling for bream in the tranquil surrounds of an Irish Harbour, Joyce noticed not one but hundreds of tiny jellyfish moving on and below the surface.

He immediately contacted the Environment Protection Agency (EPA) to seek clarity, and they put him on to Inland Fisheries Ireland (IFI). Staff from the IFI sped to the scene and collected up to 20 live specimens. They really did exist!

IFI’s Colum Walsh and Dave Germaine contacted Dr Joe Caffrey, invasive species specialist with IFI, who immediately organised a site visit to the Irish harbour with a team of marine science experts. These included Dr Tom Doyle, a jellyfish expert from the Coastal and Marine Research Centre in UCC, and Dr Dan Minchin.

The survey revealed small numbers of the jellyfish on the harbour, but specimens were also recorded from two other locations within the lake – at Rossmore Harbour and at Dromineer.

So what is this jellyfish, where did it come from and why was it never spotted in Ireland before?

As soon as specimens were collected IFI forwarded them to Dr Doyle, who identification them as the free-swimming life stage of a species called Craspedacusta sowerbii. This marks the the first official record for this species in Ireland.

This freshwater jellyfish hails from the Yangtze River Valley in China but currently has a worldwide distribution. It was initially discovered in exotic aquatic plant tanks in Regent’s Park, London in 1880 but has since spread to widely throughout the globe.

The jellyfish is about the size of a euro coin and broadly resemble their marine cousins. It is more or less transparent with a distinctive white/greenish cross and a white/cream circular outline, and possesses in the region of 250–300 small tentacles.

These jellyfish have two distinct life stages; one is a tiny attached polyp and the second is what we know as the jellyfish or medusa stage. The polyp buds off medusa under warm water conditions, generally when water temperature reaches 25 degrees centigrade.

The species is known to occur in single sexed populations, and Dr Doyle confirmed that all of the specimens he examined from Lough Derg were female.

It is probable that the discovery of this jellyfish relates to the wonderfully warm summer that we experienced in Ireland this year, when water temperatures in many watercourses exceeded 25 degrees for prolonged periods. This probably stimulated the budding off of the medusae or jellyfish, which pulsed in the warm water in search of plankton prey. It is noteworthy that jellyfish were also reported from Lough Erne in recent days.

Experience in other countries suggests that blooms of such freshwater jellyfish occur only sporadically and that they last, in any one year, for only a few weeks. So it is possible that we may not see such a sight again for many years.

It is important to state that the freshwater jellyfish is not harmful to humans and that, while they do capture their tiny prey by stinging, the stinging cells are not sufficiently powerful to harm humans.

In addition, the jellyfish do not appear to have any significant effect on the biology or ecology of the waters they are recorded in, probably due to their sporadic occurrence and the short period that the jellyfish blooms are in any water body.

'Anglers are the eyes and ears on our rivers and lakes,' said Minister of State Fergus O'Dowd following this amazing discovery. 'I ask all anglers to continue to assist in the protection and conservation of this resource, reporting any invasive species they come across to the IFI Hotline immediately.'

One serious cause for concern relates to the pathway whereby this jellyfish - and many other non-native and potentially harmful or invasive species - was introduced to Ireland.

The fact that the two watercourses from which the jellyfish was recently recorded (Loughs Derg and Erne) are both internationally renowned navigation waterways suggests that boating and perhaps ballast water from newly introduced craft may represent an important causative agent.

Boats and cruisers are commonly imported from abroad and are introduced into our waters without having to prove that they were cleaned and disinfected before leaving their country of origin.

'This practice is unacceptable and poses a significant threat to biodiversity in our waters and to their functionality, be it as recreational, amenity or municipal waters,' said Dr Caffrey. 'It is imperative that boats being imported into this country carry certificates of disinfection prior to being granted entry if we are to stop the ever-increasing spread of harmful invasive species.'

If you spot jellyfish in your local watercourse, please contact Inland Fisheries Ireland or on the 24-hour hotline 1850 34 74 24. See also the EcoJel project and the of National Biodiversity Data Centre website.


by National Biodiversity Data Centre

  

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

http://www.fishingboating-world.com/index.cfm?nid=115211

5:41 AM Mon 30 Sep 2013GMT


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







FishingBoating-World



























From Penguins to Polar Bears by Cherie Winner,






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
































Fishers encouraged to refresh knowledge of size and possession limits by Department of Agriculture, Fisheries and Forestry,


Newly discovered Juvenile Whale Shark Aggregation in the Red Sea
Risks to penguin populations continues
Dangerous conditions for boaters from this afternoon
NSW Environment Minister awards 'Fish Friendly' Marina Accreditations
Gold Coast International Marine Expo - High-Diver Steve Black is back
Discover science of maritime exploration at National Maritime Museum
4x4 Outdoors Show, Fishing and Boating Expo - Campfire cooking corner
More than 1,000 jungle perch fingerlings reared
Don’t get in a tangle using illegal nets
See the heat with FLIR ONE *Feature
John Temple to retire, Will Sangster appointed General Manager
Multihull Central launches Aquila range at SIBS *Feature
Dredging link to WA coral disease
Erin Loscocco, the foiling fisherman
Sydney International Boat Show - Days 3 & 4 *Feature
Endangered species are like Movie Stars - Charlie Sheens and Tom Hanks
Shellfish reefs in Port Phillip Bay to be rejuvenated
2014 Brisbane Boat Show - What's your trailer boat worth?
Operation GrindStop 2014
Big Dog Fat Cat Fishing Tournament - Big catches hauled in
Sydney International Boat Show - Day 2 *Feature   
Marine Rescue volunteers celebrate new unit and $120,000 vessel   
Inspections increased by QBFP to safeguard fishing industry   
Sydney International Boat Show - images from Day 1 *Feature   
Pantaenius Insurance - being seen in yellow, green and orange *Feature   
Sydney International Boat Show begins!   
Sydney International Boat Show - Changed conditions on Sydney Harbour   
Fraser Island annual fishing closure starts August 1   
Gold Coast Broadwater no closer to welcoming supermaxis *Feature   
Sydney International Boat Show - all systems go!   
EOMAP modelling shows what's under our water   
Great Barrier Reef in a bad state, and getting worse   
Gold Coast International Marine Expo - Organisers add extra sites   
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   
Predictwind helps you pick the best time to depart   
Marine Rescue volunteers rescue seven in marathon operation   
Reminder for boaties to be cautious near blind corners   
Watch this whale lift a Kayak clear out of the water   


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 WAS FBW
LocalAds   DE  ES  FR  IT