Ultra slow acoustic energy transport in dense fish aggregates.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
02 09 2021
02 09 2021
Historique:
received:
02
03
2021
accepted:
28
07
2021
entrez:
3
9
2021
pubmed:
4
9
2021
medline:
22
12
2021
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 34475477
doi: 10.1038/s41598-021-97062-4
pii: 10.1038/s41598-021-97062-4
pmc: PMC8413328
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
17541Informations de copyright
© 2021. The Author(s).
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