<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0122-9761</journal-id>
<journal-title><![CDATA[Boletín de Investigaciones Marinas y Costeras - INVEMAR]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Invest. Mar. Cost.]]></abbrev-journal-title>
<issn>0122-9761</issn>
<publisher>
<publisher-name><![CDATA[INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS "JOSE BENITO VIVES DE ANDRÉIS" (INVEMAR)    INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS -JOSE BENITO VIVES DE ANDRÉIS- (INVEMAR)]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-97612026000100108</article-id>
<article-id pub-id-type="doi">10.25268/bimc.invemar.2026.55.1.1342</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Intercalibration of scientific echosounders (EK60 and EK80) for the multiplatform acoustic assessment of anchoveta in Chile]]></article-title>
<article-title xml:lang="es"><![CDATA[Intercalibración de ecosondas científicas (EK60 y EK80) para la evaluación acústica multiplataforma de anchoveta en Chile]]></article-title>
<article-title xml:lang="es"><![CDATA[Intercalibración de ecosondas científicas (EK60 y EK80) para la evaluación acústica multiplataforma de anchoveta en Chile]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[La Cruz]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Legua]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leiva-Dietz]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Fomento Pesquero  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Fomento Pesquero  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Fomento Pesquero  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2026</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2026</year>
</pub-date>
<volume>55</volume>
<numero>1</numero>
<fpage>108</fpage>
<lpage>131</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-97612026000100108&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-97612026000100108&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-97612026000100108&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Hydroacoustic surveys are key for assessing pelagic species such as the Peruvian anchoveta (Engraulis ringens) in the Humboldt Current System (HCS), one of Chile&#8217;s most important fisheries. Oceanographic variability influences environmental conditions and resource distribution, particularly in coastal areas. However, a coverage gap persists in nearshore zones due to operational limitations of the research vessel, which restricts the spatial representativeness of routine hydroacoustic assessments. To address this gap, artisanal purse-seine vessels equipped with EK80 echosounders have been incorporated, allowing operations in areas less accessible to the main research vessel. This study evaluated the comparability and accuracy of acoustic measurements collected with EK80 echosounders on artisanal vessels against those obtained with an EK60 echosounder aboard the research vessel Abate Molina, during hydroacoustic surveys conducted between 2022 and 2024. Generalized Least Squares (GLS) models were applied to analyze backscattered energy (NASC, 38 kHz), and mean density ratios (R&#7522;) were estimated as intercalibration factors to correct for systematic differences. Results revealed a high correspondence between platforms, with adjusted biomass differences below 5.5% and no significant changes in coefficients of variation, confirming the robustness of the procedure. These findings support the complementary use of multi-platform acoustic surveys as a robust approach to enhance spatial representativeness in stock assessments and strengthen the sustainable management of the anchoveta fishery in the HCS.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los cruceros hidroacústicos son claves para evaluar especies pelágicas como la anchoveta (Engraulis ringens) en el Sistema de la Corriente de Humboldt (SCH), una de las pesquerías más importantes de Chile. Las variaciones oceanográficas afectan las condiciones ambientales y la distribución del recurso, especialmente cerca de la costa. Existe una brecha en la cobertura acústica en zonas costeras debido a limitaciones operativas del buque de investigación, lo que restringe la representatividad espacial de las evaluaciones hidroacústicas recurrentes. Para mejorar la cobertura en estas áreas, se han incorporado embarcaciones artesanales con ecosondas EK80, que pueden operar donde el buque principal tiene menor acceso. Este estudio evaluó la comparabilidad y precisión de mediciones acústicas obtenidas con ecosondas EK80 en embarcaciones artesanales cerqueras y con una ecosonda EK60 a bordo del buque de investigación Abate Molina, durante evaluaciones hidroacústicas realizadas entre 2022 y 2024. Se aplicaron modelos de Mínimos Cuadrados Generalizados para analizar la energía retrodispersada (NASC, 38 kHz), y se estimaron cocientes medios de densidades acústicas (R&#7522;) como factores de intercalibración para corregir diferencias sistemáticas. Los resultados evidenciaron una alta correspondencia entre las mediciones, con diferencias en biomasa ajustadas inferiores a 5,5 % y sin cambios significativos en los coeficientes de variación, lo que confirma la robustez del procedimiento. Estos hallazgos respaldan el uso conjunto de multiplataformas para fortalecer la gestión sostenible de la pesca de anchoveta.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Fisheries]]></kwd>
<kwd lng="en"><![CDATA[Peruvian anchoveta]]></kwd>
<kwd lng="en"><![CDATA[echosounders]]></kwd>
<kwd lng="en"><![CDATA[temporal series]]></kwd>
<kwd lng="en"><![CDATA[biomass]]></kwd>
<kwd lng="es"><![CDATA[Pesquerías]]></kwd>
<kwd lng="es"><![CDATA[anchoveta]]></kwd>
<kwd lng="es"><![CDATA[ecosondas]]></kwd>
<kwd lng="es"><![CDATA[serie temporal]]></kwd>
<kwd lng="es"><![CDATA[biomasa]]></kwd>
</kwd-group>
</article-meta>
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