<?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>S0034-77442019000300534</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v67i3.33985</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Using otolith weight to predict the age of different stocks of Sperata aor (Siluriformes: Bagridae) from the River Ganga]]></article-title>
<article-title xml:lang="es"><![CDATA[Peso de otolitos para predecir la edad de diferentes cohortes de Sperata aor (Siluriformes: Bagridae) en el Río Ganga]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nazir]]></surname>
<given-names><![CDATA[Aafaq]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Khan]]></surname>
<given-names><![CDATA[M. Afzal]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Aligarh Muslim University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>India</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<volume>67</volume>
<numero>3</numero>
<fpage>534</fpage>
<lpage>540</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442019000300534&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442019000300534&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442019000300534&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Estimation of accurate fish age is considered as an essential step for the understanding of life history characteristics, population dynamics, and the management of the fisheries resources. The otolith weight keeps on increasing because of continuous deposition of material on the otolith surface; therefore, otolith measurements are successfully used to infer fish age. The present study was conducted to estimate the relationship between otolith weight and observed age (estimated by counting annuli on the sectioned otoliths) for the stocks of Sperata aor. A total of 315 samples were collected from January 2016 to April 2017 from three different stocks of S. aor i.e. Narora-Kanpur, Varanasi and Bhagalpur from the River Ganga. Linear regression analysis was applied between otolith weight and observed age to predict the age of the fish of each stock from otolith weight. Significant relationships between otolith weight and fish age were observed for the three stocks of the selected fish species from the River Ganga (R2 &gt; 0.9, P &lt; 0.001). No significant differences were found in the otolith weight among the stocks of S. aor (ANCOVA: F2,134 = 0.047; P &gt; 0.05). Overall, 88.5, 88.8, and 87.2 % of the predicted ages were correctly classified to their observed ages for Narora-Kanpur, Varanasi, and Bhagalpur stock, respectively. Thus, it can be concluded that the relationship between otolith weight and fish age can provide a surrogate method of age estimation, and can be used to examine the age structure of the three stocks of S. aor from the River Ganga.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La estimación precisa de la edad de peces es considerada un paso esencial para la evaluación de su historia natural, dinámica de población y manejo de pesquerías. El otolito sigue creciendo debido a la continua deposición de material en la superficie; por lo tanto, las medidas del otolito son un buen indicador para inferir la edad del pez. En este estudio se evaluó la relación entre el peso de los otolitos y la edad observada (estimada contando los anillos de los otolitos seleccionados) de individuos de Sperata aor. En total se recolectaron 315 muestras entre enero 2016 y abril 2017 en tres zonas de S. aor en el Río Ganga (Narora-Kanpur, Varanasi y Bhagalpur). Se aplicó un análisis de regresión lineal entre el peso de los otolitos y la edad observada para predecir la edad de los peces de cada zona a partir del peso de los otolitos. Se observaron relaciones significativas entre el peso de los otolitos y la edad de los peces de las zonas del Río Ganga (R2 &gt; 0.9, P &lt; 0.001). También se encontraron diferencias significativas en el peso de los otolitos de las diferentes clases de edad (ANOVA: F2,114 = 3914.03; P &lt; 0.001) mientras que no fue así entre el peso de los otolitos y las distintas zonas de recolecta de S. aor (ANCOVA: F2,147 = 0.043; P &gt; 0.05). En general, 88.5, 88.8 y 87.2% de las edades predichas se clasificaron correctamente con respecto a las edades observadas para Narora-Kanpur, Varanasi y Bhagalpur, respectivamente. Se puede concluir que la relación entre el peso de los otolitos y la edad de los peces puede proveer un método para la estimación de la edad y puede ser usado para examinar la estructura de edades en tres stocks de S. aor en el Río Ganga.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[age prediction]]></kwd>
<kwd lng="en"><![CDATA[otolith weight]]></kwd>
<kwd lng="en"><![CDATA[stocks]]></kwd>
<kwd lng="en"><![CDATA[long-whiskered catfish]]></kwd>
<kwd lng="en"><![CDATA[River Ganga]]></kwd>
<kwd lng="es"><![CDATA[predicción de edad]]></kwd>
<kwd lng="es"><![CDATA[peso de otolitos]]></kwd>
<kwd lng="es"><![CDATA[bagre]]></kwd>
<kwd lng="es"><![CDATA[Río Ganga]]></kwd>
</kwd-group>
</article-meta>
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<given-names><![CDATA[X.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Using otolith weight to predict the age of Pennahia macrocephalus in the mouth of the Beibu Gulf]]></article-title>
<source><![CDATA[Chinese Journal of Oceanology and Limnology]]></source>
<year>2009</year>
<volume>27</volume>
<page-range>342-9</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
