[All-postdocs] Bioseminar Zhongchang Song

[Ana M Velez]

Woods Hole Oceanographic Institution
Biology Department Seminar
Thursday, October 13, 2022 - 12:00 Noon

Zhongchang Song
Postdoc Fellow, State Key Laboratory of Marine Environmental Science, Xiamen University

Acoustic Deterring to Reduce Fishery Bycatch of the Pantropical Spotted Dolphins (Stenella Attenuata) in the South China Sea
Commercial fishing constitutes an important food source but induces undesirable bycatch on animals worldwide. This study extends bycatch research geographically to the Western Pacific Ocean in the South China Sea, filling a knowledge gap regarding bycatch and mitigation measures in the region. Bycatch has caused many lethal consequences to the pantropical spotted dolphins (Stenella attenuata) during their interaction with fisheries in the research area. We provided a self-developed acoustic deterrent system and conducted field experiments, suggesting its effectiveness as a potential useful conservation tool to reduce bycatch. Dolphins departed the area and the number of dolphins in sight declined to zero after the deployment of the deterring system. Additional evidence was reflected in acoustic recordings, showing the number of the clicks as well as amplitude of the clicks, we recorded from dolphins decreased by 90.9% and 84% respectively. These combined results indicate that the system was effective in driving dolphins away to facilitate conservation of the species by protecting them from potential bycatch. Dolphins became habituated to the deterring signals in our latest findings, requiring a deterrent system to incorporate multiple channels to irregularly change deterring signals. We found that computed tomography scanning, numerical modeling and physical fabrication of dolphin sonar system can help to predict animal's audiogram, providing a reference to design deterring signals that are sensitive to dolphins.

Zoom: https://whoi-edu.zoom.us/j/93479661377<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fq%3Dhttps%3A%2F%2Fwhoi-edu.zoom.us%2Fj%2F93479661377%26sa%3DD%26source%3Dcalendar%26ust%3D1665838103266675%26usg%3DAOvVaw0KB3-trvi1xDcqrUR7TL02&data=05%7C01%7Call-postdocs%40whoi.edu%7C596c8469c82745ba161f08daaabe4c63%7Cd44c5cc6d18c46cc8abd4fdf5b6e5944%7C0%7C0%7C638010031731512991%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=KDRqBFTic9ZIIC8tuqoXW519r5h4s4NprdCP0YSmrYg%3D&reserved=0> Meeting ID: 934 7966 1377 By phone: Find your local number: https://whoi-edu.zoom.us/u/abadLGyPB0<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fq%3Dhttps%3A%2F%2Fwhoi-edu.zoom.us%2Fu%2FabadLGyPB0%26sa%3DD%26source%3Dcalendar%26ust%3D1665838103266675%26usg%3DAOvVaw3DZlRgONJm9T5vVglmnqua&data=05%7C01%7Call-postdocs%40whoi.edu%7C596c8469c82745ba161f08daaabe4c63%7Cd44c5cc6d18c46cc8abd4fdf5b6e5944%7C0%7C0%7C638010031731512991%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gcV67NnOBEYLqeSteJ7qGnpkPEOAQa0li5sLAnYnXLA%3D&reserved=0>
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