<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442019000601461</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v67i6.36920</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Edad y crecimiento del pez Fundulus lima (Cyprinodontiformes: Fundulidae) en el río La Purísima, Baja California Sur, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Age and growth of the fish Fundulus lima (Cyprinodontiformes: Fundulidae) in La Purísima River, Baja California Sur, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Campos]]></surname>
<given-names><![CDATA[Gorgonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arista Palacios]]></surname>
<given-names><![CDATA[Violeta Belinda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Andreu-Soler]]></surname>
<given-names><![CDATA[Asunción]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California  Facultad de Ciencias]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Baja California  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>67</volume>
<numero>6</numero>
<fpage>1461</fpage>
<lpage>1472</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442019000601461&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442019000601461&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442019000601461&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: El estudio de la edad y crecimiento en peces es un prerrequisto básico para generar información sobre la longevidad, tasas de crecimiento y estructura poblacional, entre otros atributos, todos ellos para la aplicación de políticas enfocadas en el manejo y conservación poblacional. Evaluamos estos atributos en la sardinilla peninsular en peligro de extinción (Fundulus lima) que habita los oasis de Baja California Sur, con la perspectiva de generar información base de este pez endémico.  Objetivo:  Determinar la edad, crecimiento somático y estructura de las poblaciones de F. lima en una de las cuencas hidrológicas más importantes de su ámbito de distribución.  Métodos:  De octubre 2002 a julio 2004 se muestreó F. lima en 4 sitios del río La Purísima por métodos de captura pasiva y activa. Los individuos fueron medidos y pesados en el campo, donde submuestras fueron seleccionadas para el análisis de la edad en escamas. Todos los individuos fueron liberados vivos a sus sitios originales de captura. Estimamos edad, relaciones longitud-peso y longitud-longitud, y estructura poblacional, basados en 802 individuos examinados por técnicas no invasivas.  Resultados:  El crecimiento somático de F. lima fue alométrico positivo (b &gt; 3.0) en todas las poblaciones estudiadas, con valores de "b" variando de 3.126 (Ojo de Agua) a 3.420 (El Pilón). Tres clases de edad (0, 1 y 2 años) fueron reconocidas, de las cuales la edad 1 fue la más frecuente (49 %). El método polimodal basado en datos de frecuencia de tallas identificó tres clases de edad. Longitudes totales retrocalculadas en edades previas basadas en incrementos de crecimiento en escamas fue entre 38.61 y 68.81 mm para individuos de 1 y 2 años, respectivamente.  Conclusiones:  Tres clases de edad (0, 1 y 2 años) fueron determinadas para las poblaciones de F. lima en el río La Purísima, basadas en la interpretación de anillos de crecimiento anual en escamas y en la distribución modal de frecuencia de tallas observadas. Todas las poblaciones examinadas demostraron un crecimiento alométrico positivo (b &gt; 3.0).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The study of age and growth in fishes is a basic prerequiste to generate information on longevity, growth rates, population structure, among other attributes, all of them for the application of policies focused on the population management and conservation. We evaluated these attributes in the endangered Baja California killifish (Fundulus lima) that inhabits the oases of Baja California Sur, Mexico, with the perspective of generating base information for the conservation of this endemic fish.  Objective:  To determine the age, somatic growth and population structure of F. lima in one of the most important hydrological basins of its distribution range.  Methods:  From October 2002 to July 2004 we sampled for F. lima in 4 sites of La Purisima river by using passive and active collection methods. Individuals were measured and weighed in the field, where subsamples were selected for analysis of age based on scales. All of the individuals were released alive to its original sites of capture. We assessed the age, length-weight and length-length relationships and population structure on the basis of 802 individuals examined by non-invasive techniques.  Results:  The somatic growth of F. lima was of positive allometric type (b &gt; 3.0) in all the populations studied, with values of "b" ranging from 3.126 (Ojo de Agua) to 3.420 (El Pilón). Three age class (0, 1 and 2 years old) were recognized, of which the age 1 year was the most frequent (49 %). The polimodal method based on length-frequency data also identified three age classes. Back-calculated total lengths at previous ages based in increments of growth in scales were 38.61 and 68.81 mm for individuals of 1 and 2 years, respectively.  Conclusions:  Three age classes (0, 1 and 2 years old) were determined for the populations of F. lima in La Purisima river, based on the interpretation of annual growth rings in scales and in the modal distribution of observed length frequencies. All the populations examined showed a positive allometric growth (b &gt; 3.0).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[age]]></kwd>
<kwd lng="en"><![CDATA[growth]]></kwd>
<kwd lng="en"><![CDATA[Baja California killifish]]></kwd>
<kwd lng="en"><![CDATA[Baja California Sur]]></kwd>
<kwd lng="en"><![CDATA[oases]]></kwd>
<kwd lng="es"><![CDATA[edad]]></kwd>
<kwd lng="es"><![CDATA[crecimiento]]></kwd>
<kwd lng="es"><![CDATA[sardinilla peninsular]]></kwd>
<kwd lng="es"><![CDATA[Baja California Sur]]></kwd>
<kwd lng="es"><![CDATA[oasis]]></kwd>
</kwd-group>
</article-meta>
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