Ultra slow acoustic energy transport in dense fish aggregates

Abstract A dramatic slowing down of acoustic wave transport in dense fish shoals is observed in open-sea fish cages. By employing a multi-beam ultrasonic antenna, we observe the coherent backscattering phenomenon. We extract key parameters of wave transport such as the transport mean free path and t...

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Autores principales:	Benoit Tallon, Philippe Roux, Guillaume Matte, Jean Guillard, John H. Page, Sergey E. Skipetrov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d0de2c8d971e4477918a75995d622cd0
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spelling	oai:doaj.org-article:d0de2c8d971e4477918a75995d622cd02021-12-02T15:28:52ZUltra slow acoustic energy transport in dense fish aggregates10.1038/s41598-021-97062-42045-2322https://doaj.org/article/d0de2c8d971e4477918a75995d622cd02021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97062-4https://doaj.org/toc/2045-2322Abstract A dramatic slowing down of acoustic wave transport in dense fish shoals is observed in open-sea fish cages. By employing a multi-beam ultrasonic antenna, we observe the coherent backscattering phenomenon. We extract key parameters of wave transport such as the transport mean free path and the energy transport velocity of diffusive waves from diffusion theory fits to the experimental data. The energy transport velocity is found to be about 10 times smaller than the speed of sound in water, a value that is exceptionally low compared with most observations in acoustics. By studying different models of the fish body, we explain the basic mechanism responsible for the observed very slow transport of ultrasonic waves in dense fish shoals. Our results show that, while the fish swim bladder plays an important role in wave scattering, other organs have to be considered to explain ultra-low energy transport velocities.Benoit TallonPhilippe RouxGuillaume MatteJean GuillardJohn H. PageSergey E. SkipetrovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Benoit Tallon Philippe Roux Guillaume Matte Jean Guillard John H. Page Sergey E. Skipetrov Ultra slow acoustic energy transport in dense fish aggregates
description	Abstract A dramatic slowing down of acoustic wave transport in dense fish shoals is observed in open-sea fish cages. By employing a multi-beam ultrasonic antenna, we observe the coherent backscattering phenomenon. We extract key parameters of wave transport such as the transport mean free path and the energy transport velocity of diffusive waves from diffusion theory fits to the experimental data. The energy transport velocity is found to be about 10 times smaller than the speed of sound in water, a value that is exceptionally low compared with most observations in acoustics. By studying different models of the fish body, we explain the basic mechanism responsible for the observed very slow transport of ultrasonic waves in dense fish shoals. Our results show that, while the fish swim bladder plays an important role in wave scattering, other organs have to be considered to explain ultra-low energy transport velocities.
format	article
author	Benoit Tallon Philippe Roux Guillaume Matte Jean Guillard John H. Page Sergey E. Skipetrov
author_facet	Benoit Tallon Philippe Roux Guillaume Matte Jean Guillard John H. Page Sergey E. Skipetrov
author_sort	Benoit Tallon
title	Ultra slow acoustic energy transport in dense fish aggregates
title_short	Ultra slow acoustic energy transport in dense fish aggregates
title_full	Ultra slow acoustic energy transport in dense fish aggregates
title_fullStr	Ultra slow acoustic energy transport in dense fish aggregates
title_full_unstemmed	Ultra slow acoustic energy transport in dense fish aggregates
title_sort	ultra slow acoustic energy transport in dense fish aggregates
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d0de2c8d971e4477918a75995d622cd0
work_keys_str_mv	AT benoittallon ultraslowacousticenergytransportindensefishaggregates AT philipperoux ultraslowacousticenergytransportindensefishaggregates AT guillaumematte ultraslowacousticenergytransportindensefishaggregates AT jeanguillard ultraslowacousticenergytransportindensefishaggregates AT johnhpage ultraslowacousticenergytransportindensefishaggregates AT sergeyeskipetrov ultraslowacousticenergytransportindensefishaggregates
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Ultra slow acoustic energy transport in dense fish aggregates

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