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Target strength of skipjack tuna (Katsuwanus pelamis) associated with fish aggregating devices (FADs)

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Target strength of skipjack tuna (Katsuwanus pelamis) associated with fish aggregating devices (FADs)

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dc.contributor.author Boyra, G . es_ES
dc.contributor.author Moreno, G. es_ES
dc.contributor.author Sobradillo, B. es_ES
dc.contributor.author Pérez Arjona, Isabel es_ES
dc.contributor.author Sancristóbal, I. es_ES
dc.contributor.author Demer, David es_ES
dc.date.accessioned 2019-02-09T21:03:47Z
dc.date.available 2019-02-09T21:03:47Z
dc.date.issued 2018 es_ES
dc.identifier.issn 1054-3139 es_ES
dc.identifier.uri http://hdl.handle.net/10251/116595
dc.description.abstract [EN] This paper presents measures of target strength (TS; dB re 1 m(2)) and models of TS vs. fork length (L; cm), i.e. TS = 20log(L) + b(20), for skip-jack tuna associated with fish aggregating devices (FADs) in the Central Pacific Ocean. Measurements were made using 38-, 120-, and 200-kHz split-beam echosounders on a purse-seine workboat during fishing operations. To mitigate potential bias due to unresolved targets, TS measurements were rejected if they were not simultaneously detected with multiple echosounder frequencies in approximately the same location. The filtered TS and concomitantly sampled L data were used to estimate b(20) = -76, -71, and -70.5 dB for 38, 120, and 200 kHz, respectively, using the method of least squares. For comparison, quasi-independent estimates of TS and b(20) were calculated from acoustic echo-integration and catch data representing entire aggregations around the FADs. The results differed by <= 1 dB for all three frequencies. The sensitivities of these results to variations in fish morphology and behaviour were explored using a simulation of TS for fish without swimbladders. The utility of the results on acoustic properties of skipjack tuna and next research steps to achieve selective fishing at FADs are discussed. es_ES
dc.description.sponsorship We thank the following organizations and people for their support of this work: the governments of Kiribati, Tuvalu, and Tokelau which permitted this research in their EEZs; Albacora for allowing this work aboard F/V ALBATUN TRES; Fishing Master Euken Mujika; the captain and crew; the scientists and divers J. Filmalter and F. Forget are thanked for invaluable insight about fish behaviour, vertical stratification and non-target species composition at FADs; Hector Pena for providing instruction on the sonar setup and analysis; Yolanda Lacalle for the illustration in Figure 2; and Andres Uriarte for advice concerning transmission of statistical errors. The research reported in the present document was funded by the International Seafood Sustainability Foundation (ISSF) and conducted independently by the authors. The report and its results, professional opinions and conclusions are solely the work of the authors. This paper is contribution 843 from AZTI (Marine or Food Research).
dc.language Inglés es_ES
dc.publisher Oxford University Press es_ES
dc.relation.ispartof ICES Journal of Marine Science es_ES
dc.rights Reconocimiento (by) es_ES
dc.subject Acoustics es_ES
dc.subject Echosounder es_ES
dc.subject FAD es_ES
dc.subject Frequency response es_ES
dc.subject Multiple targets es_ES
dc.subject Selectivity es_ES
dc.subject Sonar es_ES
dc.subject Split beam es_ES
dc.subject Tropical tuna es_ES
dc.subject Tuna es_ES
dc.subject.classification FISICA APLICADA es_ES
dc.title Target strength of skipjack tuna (Katsuwanus pelamis) associated with fish aggregating devices (FADs) es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1093/icesjms/fsy041 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada es_ES
dc.description.bibliographicCitation Boyra, G..; Moreno, G.; Sobradillo, B.; Pérez Arjona, I.; Sancristóbal, I.; Demer, D. (2018). Target strength of skipjack tuna (Katsuwanus pelamis) associated with fish aggregating devices (FADs). ICES Journal of Marine Science. 75(5):1790-1802. doi:10.1093/icesjms/fsy041 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://doi.org/10.1093/icesjms/fsy041 es_ES
dc.description.upvformatpinicio 1790 es_ES
dc.description.upvformatpfin 1802 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 75 es_ES
dc.description.issue 5 es_ES
dc.relation.pasarela S\366579 es_ES
dc.contributor.funder International Seafood Sustainability Foundation
dc.contributor.funder Government of Kiribati
dc.contributor.funder Governement of Tuvalu Islands
dc.contributor.funder Government of Tokelau


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