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Displaying items by tag: Shark

New research from University College Dublin on marine animals may bring closer attention to one of Ireland's least well known species of shark.

Dr Edward Farrell of UCD's School of Biology & Environmental Science spent the last four years of his PhD project studying the starry smooth-hound, a regular in the shallow waters of Ireland's east coast that can grow to over a meter in length.

"It's amazing how little was known about this species," said Farrell. "Until recently we weren't even sure what species we were dealing with, but we developed a genetic method which allowed us to confirm that it is the starry smooth-hound which occurs in Irish waters and not the related common smooth-hound."

Starry smooth-hounds are not valuable as a commercial species in Ireland, but are growing in popularity on the continent. Once abundant in the Mediterranean, their numbers have dwindled in recent years.

The sharks were previously considered a fast-growing species, meaning they were not a conservation concern. However Farrell's research has revealed that those in Irish waters actually grow twice as slowly as once thought, and only reproduce every two years rather than annually.

"There are currently no management measures for this species in European waters mainly due to the lack of biological information," said Farrell. "So our main aim was to gather the necessary data.

"Hopefully this can be used now to ensure their sustainability and prevent a repeat of the overexploitation seen in Mediterranean waters."

Published in Marine Wildlife

Scientists at the Marine Institute, Galway, are working with anglers around Ireland to study the migration and diving behaviour of porbeagle sharks (Latin name - Lamna nasus) in the northeast Atlantic. Porbeagle sharks are one of the top marine predators around Ireland, but very little is known about their movement patterns in the northeast Atlantic.

Like most pelagic sharks around the world, the porbeagle shark is vulnerable to fishing pressure due to its high commercial value, slow growth rate and complicated reproductive cycle. However, there is currently no protective legislation for the species, primarily due to a lack of basic information on its biology and ecology.

Marine Institute fisheries scientist Dr. Maurice Clarke said, "Understanding the biology and spatial ecology of the porbeagle shark is key to the conservation of the species and for establishing successful ecosystem-based management strategies in the northeast Atlantic".

To study the movement patterns of porbeagles, scientists are using pop-up satellite tags. These tags are fitted harmlessly to the back of the shark and collect information on the animals' location and depth distribution, together with data on the environment in which the sharks live. Then after nine months the tags pop-up to the surface and transmit the data to polar-orbiting satellites.

With help from expert shark angler, Peter McAuley, three tags were deployed off Downings, Donegal, in September 2008. These data have provided new insight into the migration and diving behaviour of porbeagle sharks around Ireland. One shark, a juvenile male, migrated over 2400 km to Madeira off the west coast of Morocco during the wintertime. Another shark migrated to the Bay of Biscay, a region that is considered a hotspot for other shark-like species such as albacore tuna. The results also showed that porbeagle diving behaviour is linked strongly to the day-night cycle and the monthly lunar cycle.

Daragh Brown of BIM commented that, "These results are really interesting and since there isn't a whole lot known about porbeagle behaviour or habitat preference, even small amounts of data can really advance our knowledge".

This year, Marine Institute scientists are hoping to tag large adult females to find out the location of porbeagle birthing grounds. Currently nothing is known about where these large predators give birth.

The Marine Institute is currently working with the Irish Elasmobranch Group, French Research Institute for Exploration of the Seas (IFREMER), and the Association for the Conservation of Sharks (APECS) to find further funding for the project that will end in 2011. They aim to establish links between the fishing industry, recreational anglers and the public to increase research and awareness for the conservation of these sharks.

Dr. Edward Farrell (Irish Elasmobranch Group) said, "Pelagic sharks have received much global attention recently. Given the increasing pressures that threaten their survival, there is a pressing need for new research to underpin effective management measures".

 

Published in Marine Wildlife
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About boot Düsseldorf: With almost 250,000 visitors, boot Düsseldorf is the world's largest boat and water sports fair and every year in January the “meeting place" for the entire industry. From 18 to 26 January 2020, around 2,000 exhibitors will be presenting their interesting new products, attractive further developments and maritime equipment. This means that the complete market will be on site in Düsseldorf and will be inviting visitors on nine days of the fair to an exciting journey through the entire world of water sports in 17 exhibition halls covering 220,000 square meters. With a focus on boats and yachts, engines and engine technology, equipment and accessories, services, canoes, kayaks, kitesurfing, rowing, diving, surfing, wakeboarding, windsurfing, SUP, fishing, maritime art, marinas, water sports facilities as well as beach resorts and charter, there is something for every water sports enthusiast.

At A Glance – Boot Dusseldorf 

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Messe Düsseldorf GmbH
Messeplatz
40474 Düsseldorf
Tel: +49 211 4560-01
Fax: +49 211 4560-668
Web: https://www.boot.com/

The first boats and yachts will once again be arriving in December via the Rhine.

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