"Characterization of sound scattering layers in the Bay of Biscay using broadband acoustics, nets and video" acoustics and biological Data

Date 2016-05
Temporal extent 2016-05-27 -2016-05-31
Author(s) Blanluet Arthur1, Doray MathieuORCID1, Berger LaurentORCID2, Romagnan Jean-Baptiste1, Le Bouffant Naig2, Lehuta SigridORCID1, Petitgas Pierre1
Contributor(s) Bourriau Paul, Pennors Laurence
Affiliation(s) 1 : Ifremer, Unité Écologie et Modèles pour l’Halieutique, Nantes, France
2 : Ifremer, Service Acoustique Sous-marine et Traitement de l’Information, Brest, France
DOI 10.17882/62440
Publisher SEANOE
Keyword(s) Acoustic backscattering, broadband, uncertainty analysis, siphonophore, zooplankton

Sound scattering layers (SSLs) are observed over a broad range of spatio-temporal scales and geographical areas. SSLs represent a large biomass, likely involved in the biological carbon pump and the structure of marine trophic webs. Yet, the taxonomic composition remains largely unknown for many SSLs. To investigate the challenges of SSL sampling, we performed a survey in a small study area in the Northern Bay of Biscay (France) by combining broadband and narrowband acoustics, net sampling, imagery and video recordings. In order to identify organisms contributing to the observed SSLs, we compared measured frequency spectra to forward predicted spectra derived from biological data.

This dataset comprises the echo-integrated broadband acoustic data (in Sv(f)), the nets position and depth, and the abundance and the size of the catched organisms acquired during a specific operation of SSLs sampling during PELGAS 2016. The acoustic data have been echo-integrated by cells of 5 ping in horizontal and 1.5 meter in vertical. The biological data comes from video counting, direct measurement, ZooCAM or ZooScan plankton imagerie tools; they were generally identify at a low taxonomic level, but sufficient for the modelisation of their acoustics backscattering. More detail of the biological/acoustical data acquisition and processing can be find in Blanluet et al., (under review). This dataset was used in Blanluet et al..

Licence CC0
Utilisation Data are published without any warranty, express or implied. The user assumes all risk arising from his/her use of data. Data are intended to be research-quality, but it is possible that these data contain errors. It is the sole responsibility of the user to assess if the data are appropriate for his/her use, and to interpret the data accordingly. Authors welcome users to ask questions and report problems.
Acknowledgements PELGAS surveys have been funded by the European Common Fishery Policy Data Collection Framework through the European Maritime and Fisheries Fund, the Marine Strategy Framework Directive, and Ifremer. We want to acknowledge the joint efforts of R/V Thalassa crews and PELGAS 2016 scientists that made the survey possible.
Sensor metadata

Sensors metadata are described in Doray et al., (2014, 2017a). All EK80 broadband data parameters and calibration can be find in Blanluet et al..

File Size Format Processing Access
Echo-integrated broadband data of the PELGAS 2016 survey from the 27/05/2016 to the 01/05/2016 1003 MB .mat Processed data Open access
Biological data 334 KB CSV Processed data Open access
Gear description 1 KB CSV Open access
sample metadata 6 KB CSV Open access
Readme 4 KB TEXTE Open access
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How to cite 

Blanluet Arthur, Doray Mathieu, Berger Laurent, Romagnan Jean-Baptiste, Le Bouffant Naig, Lehuta Sigrid, Petitgas Pierre (2016). "Characterization of sound scattering layers in the Bay of Biscay using broadband acoustics, nets and video" acoustics and biological Data. SEANOE. https://doi.org/10.17882/62440