Marine Life & Conservation
Tags on leatherback turtles reveal by-catch hotspots
A study using satellite data from tagged leatherback turtles has identified possible “by-catch hotspots” in the Pacific Ocean.
By tracking 135 turtles, researchers highlighted areas where the critically endangered animals were likely to come into contact with fishing vessels.
The authors hoped the findings could be used to help cut the number of turtles accidentally killed as by-catch.
The paper appears in the Proceedings of the Royal Society B journal.
The species, scientifically known as Dermochelys coriacea, is globally listed as vulnerable by the International Union for Conservation of Nature’s Red List of Threatened Species.
However, conservationists have identified a number of distinct populations in the world’s various oceans. Within the Pacific, the two populations – eastern and western – are considered to be critically endangered.
For this study, data was collated from numerous projects between 1992 and 2008, explained lead author John Roe from the University of North California’s Pembroke campus.
“To really get an idea about where the leatherbacks go, you have got to have turtles tagged from multiple locations,” he said.
“So it took getting just about everyone who has put a satellite tag on a leatherback for other research purposes to collaborate to get a sample size large enough to allow us to answer that question.”
Dr Roe and his colleagues from a range of US and Costa Rican institutes then integrated the turtle location data with similar data of where the longline fishing activity in the Pacific Ocean was highest.
“We used that data to overlay with the data of the areas the turtles were using in order to figure out where the turtle hotspots matched with the fisheries hotspots to identify the areas where by-catch was most likely to occur.”
Writing in their paper, the team observed: “For East Pacific nesters, an area of potential risk occurs along the primary leatherback migration corridor between Costa Rica and the Galapagos Islands.
“For the West Pacific population, …the greatest by-catch was predicted to occur adjacent to nesting beaches in north-west New Guinea.”
They added that the analysis represented the largest compilation of data of its kind.
However, Dr Roe said that more tagging data was required in order to establish a more detailed picture.
“We need to target these areas to see if the turtle persistently use these areas over and over again,” he said.
“That would provide really useful information in the management of by-catch because the fisheries authorities would have that knowledge and adjust their fishing efforts accordingly.”
He added: “We are just trying to highlight some areas to make it easier to look for these needles in a haystack.
“The idea now is to try and get some more refined information in those targeted areas but we now know where and when to look, and where to concentrate our efforts.”
Source: www.bbc.co.uk/news
Blogs
Invitation from The Ocean Cleanup for San Francisco port call
6 years ago, The Ocean Cleanup set sail for the Great Pacific Garbage Patch with one goal: to develop the technology to be able to relegate the patch to the history books. On 6 September 2024, The Ocean Cleanup fleet returns to San Francisco bringing with it System 03 to announce the next phase of the cleanup of the Great Pacific Garbage Patch and to offer you a chance to view our cleanup system up-close and personal.
We look forward to seeing you there.
To confirm your presence, please RSVP to press@theoceancleanup.com
PROGRAM
Join The Ocean Cleanup as our two iconic ships and the extraction System 03 return to San Francisco, 6 years and over 100 extractions after we set sail, to create and validate the technology needed to rid the oceans of plastic.
Our founder and CEO, Boyan Slat, will announce the next steps for the cleanup of the Great Pacific Garbage Patch. Giving you a chance to view our cleanup system and the plastic extracted.
Hear important news on what’s next in the mission of The Ocean Cleanup as it seeks to make its mission of ridding the world’s oceans of plastic an achievable and realistic goal.
Interviews and vessel tours are available on request.
PRACTICALITIES
Date: September 6, 2024
Press conference: 12 pm (noon)
Location: The Exploratorium (Google Maps)
Pier 15 (Embarcadero at Green Street), San Francisco, CA
Parking: Visit The Exploratorium’s website for details.
RSVP: press@theoceancleanup.com
Video & photo material from several viewing spots around the bay
We look forward to seeing you there!
ABOUT THE OCEAN CLEANUP
The Ocean Cleanup is an international non-profit that develops and scales technologies to rid the world’s oceans of plastic. They aim to achieve this goal through a dual strategy: intercepting in rivers to stop the flow and cleaning up what has already accumulated in the ocean. For the latter, The Ocean Cleanup develops and deploys large-scale systems to efficiently concentrate the plastic for periodic removal. This plastic is tracked and traced to certify claims of origin when recycling it into new products. To curb the tide via rivers, The Ocean Cleanup has developed Interceptor™ Solutions to halt and extract riverine plastic before it reaches the ocean. As of June 2024, the non-profit has collected over 12 million kilograms (26.4 million pounds) of plastic from aquatic ecosystems around the world. Founded in 2013 by Boyan Slat, The Ocean Cleanup now employs a broadly multi-disciplined team of approximately 140. The foundation is headquartered in Rotterdam, the Netherlands, and opened its first regional office in Kuala Lumpur, Malaysia, in 2023.
Find out more about The Ocean Cleanup at www.theoceancleanup.com.
Marine Life & Conservation
SHARK MONTH ARRIVES AT ROYAL WILLIAM YARD, PLYMOUTH
A shark has been spotted approaching Royal William Yard in Plymouth, much to the surprise of swimmers, paddleboarders and onlookers.
With its distinctive dorsal fin cutting through the water, the sizeable shark swam along the coastline, before turning to head inland towards Firestone Arch at Royal William Yard. The appearance drew a crowd, who were captivated for more than an hour by the unusual sight – and it was all caught on video.
The shark is one of many expected sightings at Royal William Yard over the coming weeks… because today marks the start of Shark Month!
In reality, the ‘shark’ spotted along the Plymouth shoreline was actually a custom-made model, created by the team at Royal William Yard and sailed underwater by Caroline Robertson‑Brown from the Shark Trust, who donned scuba diving gear for the occasion.
The stunt took place to launch Shark Month in style and draw attention to the work of the leading international conservation charity, which is based in Britain’s Ocean City. Spectators were reassured that the water was safe and many entered into the spirit of the performance, swimming or sailing alongside the shark.
Shark Month will take place across Royal William Yard throughout July and will feature an extravaganza of art, entertainment and advocacy for everyone to enjoy. The packed programme of events starts with an art exhibition and ends with a trip on paddleboards with shark experts – with everything from a shark quiz to a Jaws screening in between.
Paul Cox, CEO of the Shark Trust, said: “There are often assumptions and misconceptions when it comes to sharks. This was certainly the case with the shark spotted at Royal William Yard! While the British coastline is home to many species of shark, this was not one of them. However, we’re thrilled it caught people’s attention, because seeing a shark is a special and memorable moment. That is precisely why we want to celebrate these incredible creatures, highlight the need for conservation, and ask for help to safeguard their future.”
For more information about Shark Month at Royal William Yard, visit the Shark Trust Website.
Images and video: Jay Stone
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