<?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>S0122-97612025000200070</article-id>
<article-id pub-id-type="doi">10.25268/bimc.invemar.2025.54.2.1321</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Length estimation of anchovy (Engraulis ringens) using echosounder in difficult to access fishing areas in the Atacama Region, Chile]]></article-title>
<article-title xml:lang="es"><![CDATA[Estimación de tallas de anchoveta (Engraulis ringens) mediante ecosonda en áreas pesqueras de difícil acceso en la Región de Atacama, Chile]]></article-title>
<article-title xml:lang="es"><![CDATA[Estimación de tallas de anchoveta (Engraulis ringens) mediante ecosonda en áreas pesqueras de difícil acceso en la Región de Atacama, 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[Ibieta]]></surname>
<given-names><![CDATA[Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Henríquez-Pastene]]></surname>
<given-names><![CDATA[Cristián]]></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 (IFOP)  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Fomento Pesquero (IFOP)  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Fomento Pesquero (IFOP)  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Fomento Pesquero (IFOP)  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto de Fomento Pesquero (IFOP)  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>54</volume>
<numero>2</numero>
<fpage>70</fpage>
<lpage>89</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-97612025000200070&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-97612025000200070&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-97612025000200070&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study explores the use of hydroacoustic methods to estimate the size distribution of Peruvian anchoveta, offering an alternative to traditional biological sampling methods. Acoustic data were collected using two algorithms: Single Target and Tracked Target, along with a TS to length conversion model specific to Peruvian anchoveta. The results showed that the Single Target algorithm estimated sizes ranging from 8.5 to 16 cm, with a mode of 12.0 cm, while the Tracked Target algorithm identified a range of 9 to 14 cm, with a mode of 11.5 cm. Juvenile anchovies represented 45.8% and 51.2% of the population in each algorithm, respectively. Additionally, the depth of the echoes ranged from 3.92 to 43.95 m, suggesting that larger Peruvian anchoveta tend to inhabit deeper coastal zones, possibly as a physiological adaptation to these environments. The study demonstrates the effectiveness of hydroacoustics for estimating fish sizes, especially in areas where traditional sampling is inaccessible or difficult to carry out. This approach contributes to understanding fish population dynamics and opens the door to future studies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Este estudio explora el uso de métodos hidroacústicos para estimar la distribución de las longitudes de anchovetas, ofreciendo una alternativa a los métodos tradicionales de muestreo biológico. Se recolectaron datos acústicos utilizando dos algoritmos: Single Target y Tracked Target, junto con un modelo de conversión de TS a longitud específico para anchoveta. Los resultados mostraron que el algoritmo Single Target estimó tamaños de 8,5 a 16 cm, con una moda de 12,0 cm, mientras que el algoritmo Tracked Target identificó un rango de 9 a 14 cm, con una moda de 11,5 cm. Las anchovetas juveniles representaron el 45,8% y el 51,2% de la población en cada algoritmo. Además, la profundidad de los ecos osciló entre 3,92 y 43,95 m, lo que sugiere que las anchovetas de mayor longitud tienden a habitar zonas costeras más profundas, posiblemente como una adaptación fisiológica a estos ambientes. El estudio demuestra la efectividad de la hidroacústica para estimar las tallas de peces, especialmente en áreas donde el muestreo tradicional es inaccesible o difícil de llevar a cabo. Este enfoque contribuye a comprender la dinámica de las poblaciones de peces y abre la puerta a futuros estudios.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pelagic]]></kwd>
<kwd lng="en"><![CDATA[Peruvian anchoveta]]></kwd>
<kwd lng="en"><![CDATA[fisheries]]></kwd>
<kwd lng="en"><![CDATA[monitoring]]></kwd>
<kwd lng="en"><![CDATA[echo sounder]]></kwd>
<kwd lng="es"><![CDATA[Pelágico]]></kwd>
<kwd lng="es"><![CDATA[anchoveta]]></kwd>
<kwd lng="es"><![CDATA[pesquerías]]></kwd>
<kwd lng="es"><![CDATA[monitoreo]]></kwd>
<kwd lng="es"><![CDATA[ecosonda]]></kwd>
</kwd-group>
</article-meta>
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