Settings of demersal longlines reveal acoustic cues that can inform toothed whales where and when to depredate

• Published in: JASA Express Letters
• Main Authors: Richard, Gaétan, Samaran, Flore, Guinet, Christophe, Bonnel, Julien
• Other Authors: Laboratoire des Sciences et Techniques de l'Information, de la Communication et de la Connaissance, Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Applied Ocean Physics and Engineering Department Massachusetts, USA, Woods Hole Oceanographic Institution (WHOI)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2021
• Subjects: [SDE]Environmental Sciences; toothed whales
• Online Access: https://hal.archives-ouvertes.fr/hal-03109933; https://doi.org/10.1121/10.0003191

International audience Fishing boats produce acoustic cues while hauling longlines. These acoustic signals are known to be used by odontocetesto detect the fishing activity and to depredate. However, very little is known about potential interactions before hauling.This article describes the acoustic signature of the setting activity. Using passive acoustic recorders attached to the buoys oflonglines, this work demonstrates an increase in the ambient sound of 6dB re 1 lPa2 Hz1 within 2–7 kHz during the settingactivity. This could also be used as an acoustic cue by depredating species, suggesting that predators can detect longlinesas soon as they are set.