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Title: Ex situ and in situ target strength measurements of European anchovy in the Bay of Biscay
Authors: Sobradillo, B.; Boyra, G.; Perez-Arjona, I; Martinez, U. and Espinosa, V
Citation: ICES JOURNAL OF MARINE SCIENCE, 2021, 78, 782-796
Abstract: This study measures the dorsal aspect target strength (TS; dB re 1m(2)) and TS-length (standard length, SL; cm) relationships for European anchovy, attained both ex situ and in situ in two different seasons across 7 years in the Bay of Biscay. The measurements were made at three frequently used acoustic frequencies (38, 120, and 200 kHz). A backscattering model for physostome fish was utilized to help interpret the results. The obtained experimental mean TS for anchovies with an SL of 3.5-19.5 cm was -44.6 (+/- 2.3), -46.9 (63), and -48.4 (+/- 2.7) dB at 38, 120, and 200 kHz, respectively, yielding b(20) values of -66.4, -68.7, and -70.4 dB, respectively. The results were consistent across seasons and between in situ and ex situ conditions, presenting TS-length relationships with statistically significant slopes (p-values <0.05) for all frequencies. This research represents part of a series of efforts planned to obtain a comprehensive TS vs. length and depth relationship to update the acoustic assessment methodology of European anchovy in the Bay of Biscay.
Keywords: Engraulis encrasicolus; ex situ; in situ; method of fundamental solutions; target strength; ACOUSTIC SCATTERING; ENGRAULIS-JAPONICUS; PELAGIC FISH; SWIMBLADDER; MACKEREL; BIOMASS; BACKSCATTERING; DISTRIBUTIONS; BEHAVIOR; MODELS
Issue Date: 2021
Type: Review
DOI: 10.1093/icesjms/fsaa242
ISSN: 1054-3139
E-ISSN: 1095-9289
Funder: AZTI-Tecnalia
research project JAULA
research project JUVENA
Department of Agriculture, Fisheries and Food of the Basque Country Government
Direccion de Innovacion y Desarrollo Tecnologico, Viceconsejeria de Politica e Industria Alimentaria, Dpto. Agricultura, Pesca y Alimentacion of the Basque Government
Secretaria General del Mar, Ministerio de Agricultura, Alimentacion y Medio Ambiente of the Spanish Government
Appears in Publication types:Artículos científicos

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