Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation

We evaluated the loss of sensitivity due to the motion experienced by a hull-mounted transducer and its effects upon the estimated biomass of southern blue whiting (Micromesistius australis) in an acoustic survey conducted in the southeastern Pacific, off the Chilean coast, during the austral winter...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Saavedra,Alvaro, Castillo,Jorge, Niklitschek,Edwin J, Saavedra-Nievas,J.C
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2012
Materias:	NASC correction factor transducer motion pitch and roll fisheries acoustics southern blue whiting Micromesistius australis echo integration Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000300021
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0718-560X2012000300021
record_format	dspace
spelling	oai:scielo:S0718-560X20120003000212013-01-03Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuationSaavedra,AlvaroCastillo,JorgeNiklitschek,Edwin JSaavedra-Nievas,J.C NASC correction factor transducer motion pitch and roll fisheries acoustics southern blue whiting Micromesistius australis echo integration Chile We evaluated the loss of sensitivity due to the motion experienced by a hull-mounted transducer and its effects upon the estimated biomass of southern blue whiting (Micromesistius australis) in an acoustic survey conducted in the southeastern Pacific, off the Chilean coast, during the austral winter of 2009. Vessel motion data (pitch and roll) were registered in situ using a digital clinometer and used to correct the nautical area scattering coefficients (NASC) in elementary sampling units of 926 m distance by 10 m depth. These NASC correction factors (NASCcp) were calculated using Dunford's algorithm for circular transducers. We found high variability in NASCcp, which averaged 12%, and ranged between 0 and 50%. NASCcp variability was explained significantly by the mean depth of the integrated stratum (33%), the weather condition, as measured by Beaufort's scale (5%), and the vessel course relative to wind direction (2%). The empirical model we used to explain NASC Cp variability may be suitable for correcting bias due to transducer motion in other, past and future, fisheries acoustic surveys targeting mid-water species under rough weather conditions.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.40 n.SpecIssue 20122012-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000300021en103856/vol40-issue3-fulltext-21
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	NASC correction factor transducer motion pitch and roll fisheries acoustics southern blue whiting Micromesistius australis echo integration Chile
spellingShingle	NASC correction factor transducer motion pitch and roll fisheries acoustics southern blue whiting Micromesistius australis echo integration Chile Saavedra,Alvaro Castillo,Jorge Niklitschek,Edwin J Saavedra-Nievas,J.C Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation
description	We evaluated the loss of sensitivity due to the motion experienced by a hull-mounted transducer and its effects upon the estimated biomass of southern blue whiting (Micromesistius australis) in an acoustic survey conducted in the southeastern Pacific, off the Chilean coast, during the austral winter of 2009. Vessel motion data (pitch and roll) were registered in situ using a digital clinometer and used to correct the nautical area scattering coefficients (NASC) in elementary sampling units of 926 m distance by 10 m depth. These NASC correction factors (NASCcp) were calculated using Dunford's algorithm for circular transducers. We found high variability in NASCcp, which averaged 12%, and ranged between 0 and 50%. NASCcp variability was explained significantly by the mean depth of the integrated stratum (33%), the weather condition, as measured by Beaufort's scale (5%), and the vessel course relative to wind direction (2%). The empirical model we used to explain NASC Cp variability may be suitable for correcting bias due to transducer motion in other, past and future, fisheries acoustic surveys targeting mid-water species under rough weather conditions.
author	Saavedra,Alvaro Castillo,Jorge Niklitschek,Edwin J Saavedra-Nievas,J.C
author_facet	Saavedra,Alvaro Castillo,Jorge Niklitschek,Edwin J Saavedra-Nievas,J.C
author_sort	Saavedra,Alvaro
title	Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation
title_short	Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation
title_full	Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation
title_fullStr	Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation
title_full_unstemmed	Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation
title_sort	reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (micromesistius australis) in the southeastern pacific: transducer motion effects upon acoustic attenuation
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000300021
work_keys_str_mv	AT saavedraalvaro reducinguncertaintyandbiasinacousticbiomassestimationsofsouthernbluewhitingmicromesistiusaustralisinthesoutheasternpacifictransducermotioneffectsuponacousticattenuation AT castillojorge reducinguncertaintyandbiasinacousticbiomassestimationsofsouthernbluewhitingmicromesistiusaustralisinthesoutheasternpacifictransducermotioneffectsuponacousticattenuation AT niklitschekedwinj reducinguncertaintyandbiasinacousticbiomassestimationsofsouthernbluewhitingmicromesistiusaustralisinthesoutheasternpacifictransducermotioneffectsuponacousticattenuation AT saavedranievasjc reducinguncertaintyandbiasinacousticbiomassestimationsofsouthernbluewhitingmicromesistiusaustralisinthesoutheasternpacifictransducermotioneffectsuponacousticattenuation
_version_	1714205097437691904

Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation

Ejemplares similares