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Home Science News Medicine

Catch and release can give sea turtles the bends #ASA186

May 13, 2024
in Medicine
Reading Time: 4 mins read
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A sea turtle getting an ultrasound at Oceanogràfic as part of a veterinary procedure
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OTTAWA, Ontario, May 13, 2024 – Six out of seven sea turtle species are endangered, and humans are primarily responsible. Commercial fishing activities are the largest human-caused disturbance to sea turtles due to accidental capture.

A sea turtle getting an ultrasound at Oceanogràfic as part of a veterinary procedure

Credit: Katherine Eltz

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OTTAWA, Ontario, May 13, 2024 – Six out of seven sea turtle species are endangered, and humans are primarily responsible. Commercial fishing activities are the largest human-caused disturbance to sea turtles due to accidental capture.

Fishers are typically unaware if a sea turtle is caught in their net until it’s completely pulled out of the water. However, releasing sea turtles without veterinary evaluations can be harmful. When accidentally caught, the turtles’ normal diving processes are interrupted, which can cause abnormal gas in their organs, gas emboli, to form. Veterinarians around the globe are working to understand the possible consequences of this pathology and determine the best treatment for turtles depending on when they surface. Here, they used ultrasound imaging to get a closer look at sea turtles’ bodies in real time, focusing on the heart, liver, and kidney.

Katherine Eltz, a first-year doctoral student at the University of North Carolina at Chapel Hill, determined that there are ways to differentiate gas levels over time in sea turtles. Eltz, whose home laboratory focuses on ultrasound imaging for decompression sickness mitigation in humans, collaborated with veterinarians who measured gas emboli in turtles in real time on fishing boats. She will present her work Monday, May 13, at 4:00 p.m. EDT as part of a joint meeting of the Acoustical Society of America and the Canadian Acoustical Association, running May 13-17 at the Shaw Centre located in downtown Ottawa, Ontario, Canada.

“Veterinarians can examine whole-body MRI or X-ray scans and find specific bubbles in a variety of different organs,” said Eltz. “The benefit of ultrasound is that we can see bubbles flowing through vessels or stationary in tissues. The portability of ultrasound means that it can be brought onto fishing boats, which we took advantage of to collect half of the data used in this project.”

Her collaborators from the Oceanogràfic Foundation were the first to report decompression sickness in turtles. Eltz examined ultrasound data collected from sea turtles found off the coast of Brazil, Italy, and Spain, though this issue is found in sea turtles worldwide. The data collection from Eltz’s collaborators at Oceanogràfic comes from veterinarians who joined fishers off the coasts of these countries and imaged the turtles immediately to monitor their bubbles after surfacing.

Eltz’s results come from two experimental groups with different circumstances regarding time and gas severity. The brightness from the ultrasounds taken from the groups is a valuable quantitative metric to separate each ultrasound by grade. These findings can help veterinarians better treat sea turtles presenting with gas embolism. Ultrasound brightness could become a quantitative metric for veterinarians to determine which turtles need hyperbaric oxygen treatment and which can be released.

“The largest task still at hand is to work towards standardizing the acquisition of the ultrasound data collected for this project,” said Eltz. “Now, I can work with veterinarians to help adjust their methods, including improved image processing to standardize the data in post-processing.”

With a rich dataset from Oceanogràfic at her disposal, Eltz hopes to examine other possible factors that may be related to gas severity. These insights all help lead to better prediction of the outcomes for bycaught sea turtles.

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———————– MORE MEETING INFORMATION ———————–

Main meeting website:  
Technical program:

ASA PRESS ROOM

In the coming weeks, ASA’s Press Room will be updated with newsworthy stories and the press conference schedule at https://acoustics.org/asa-press-room/.

LAY LANGUAGE PAPERS

ASA will also share dozens of lay language papers about topics covered at the conference. Lay language papers are summaries (300-500 words) of presentations written by scientists for a general audience. They will be accompanied by photos, audio, and video. Learn more at https://acoustics.org/lay-language-papers/.

PRESS REGISTRATION

ASA will grant free registration to credentialed and professional freelance journalists. If you are a reporter and would like to attend the hybrid / in-person meeting or virtual press conferences, contact AIP Media Services at media@aip.org. For urgent requests, AIP staff can also help with setting up interviews and obtaining images, sound clips, or background information.

ABOUT THE ACOUSTICAL SOCIETY OF AMERICA

The Acoustical Society of America is the premier international scientific society in acoustics devoted to the science and technology of sound. Its 7,000 members worldwide represent a broad spectrum of the study of acoustics. ASA publications include The Journal of the Acoustical Society of America (the world’s leading journal on acoustics), JASA Express Letters, Proceedings of Meetings on Acoustics, Acoustics Today magazine, books, and standards on acoustics. The society also holds two major scientific meetings each year. See https://acousticalsociety.org/. 

ABOUT THE CANADIAN ACOUSTICAL ASSOCIATION/ASSOCIATION CANADIENNE D’ACOUSTIQUE

•            fosters communication among people working in all areas of acoustics in Canada 
•            promotes the growth and practical application of knowledge in acoustics 
•            encourages education, research, protection of the environment, and employment in acoustics 
•            is an umbrella organization through which general issues in education, employment and research can be addressed at a national and multidisciplinary level

The CAA is a member society of the International Institute of Noise Control Engineering (I-INCE) and the International Commission for Acoustics (ICA) and is an affiliate society of the International Institute of Acoustics and Vibration (IIAV). Visit https://caa-aca.ca/. 

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