Villalobos H. auteur aut IRD Nevarez Martinez M.O. auteur aut IRD Santos-Molina J.P. auteur aut IRD Gonzalez-Maynez V.E. auteur aut IRD Angeles Martinez-Zavala M. de los auteur aut IRD Hermand J.P. auteur aut IRD Brehmer Patrice auteur aut IRD text bookSection eng text/pdf born digital access It is necessary to refine the acoustic estimation method applied in the Gulf of California, especially regarding the acoustic energy allocation to the different species coexisting in the same area, in order to produce a more precise and reliable fishery independent biomass index for the sustainable management of the fishery. The series of acoustic surveys carried out in this work are the first systematic attempts to estimate Pacific sardine biomass in the Gulf of California. Due to similar acoustic reflectivity of other pelagic species, we need to refine the allocation of acoustic energy to species. From 2012, besides the 38 kHz transducer another frequency has been incorporated (120 kHz) in the surveys. With both frequencies we will apply acoustic signal filtering procedures in order to 1). Discriminate zooplankton echoes from fish echoes and 2). Investigate the possibility to better discriminate the Pacific sardine from other species. specialized ESTIMATION DE STOCK ESPECE PELAGIQUE SARDINE BIOMASSE PROSPECTION ACOUSTIQUE MODELISATION VARIATION PLURIANNUELLE MEXIQUE 040PECHE03 4 Piscataway IEEE 2013 RIO Acoustics 2013, Rio de Janeiro (BRA), 2013/07/24-26 https://www.documentation.ird.fr/hor/fdi:010064374 10.1109/RIOAcoustics.2013.6683996 978-1-4799-0362-7 [F B010064374] https://www.documentation.ird.fr/hor/fdi:010064374 https://www.documentation.ird.fr/intranet/publi/depot/2015-04-27/010064374.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-04-27 2024-01-08 fdi:010064374 fre