<?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>S0034-77442025000100039</article-id>
<article-id pub-id-type="doi">10.15517/rev.biol.trop..v73i1.58796</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Histomorphometry of the gastrointestinal tract of the fish Pseudoplatystoma magdaleniatum (Siluriformes: Pimelodidae)]]></article-title>
<article-title xml:lang=""><![CDATA[Histomorfometría del tracto gastrointestinal del pez Pseudoplatystoma magdaleniatum (Siluriformes: Pimelodidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata-Muñoz]]></surname>
<given-names><![CDATA[Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Obando]]></surname>
<given-names><![CDATA[Diana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vásquez-Machado]]></surname>
<given-names><![CDATA[Gersson]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Espinosa]]></surname>
<given-names><![CDATA[Mariana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-Posada]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yepes-Blandón]]></surname>
<given-names><![CDATA[Jonny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias Research Group on Native and Exotic Aquatic Organisms]]></institution>
<addr-line><![CDATA[ Medellín]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,HISTOLAB  ]]></institution>
<addr-line><![CDATA[ Bogotá]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de estudio e investigación en acuicultura  ]]></institution>
<addr-line><![CDATA[ Villavicencio]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,ISAGEN S.A. E.S.P  ]]></institution>
<addr-line><![CDATA[ Medellín]]></addr-line>
<country>Colombia</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>73</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442025000100039&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442025000100039&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442025000100039&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Pseudoplatystoma magdaleniatum, commonly known as striped catfish, is an endemic species of the Magdalena River basin, characterized by its large size and high commercial value. Given its critical endangerment due to overfishing, understanding its gastrointestinal tract morphology is crucial for conservation efforts and management in fish stocking programs.  Objective:  To characterize the morphology, histology, and histochemical qualities of the gastrointestinal tract of P. magdaleniatum, an endemic fish species in the Magdalena River basin, Colombia.  Methods:  Measurements of body height and weight of 22 captured adult individuals were taken, as well as of the organs comprising the digestive tract (esophagus, stomach, and intestine), and accessory and glandular organs (liver and gonads). Histological techniques, such as Hematoxylin and Eosin staining, were performed to characterize the organs structurally. Histochemical techniques were employed to describe the dynamics of mucins, and transmission electron microscopy was used.  Results:  The stomach and intestine exhibited four layers: mucosa, submucosa (absent in the esophagus), muscular, and serosa. The esophagus, with only three layers, was characterized by the presence of stratified squamous epithelium with goblet cells, club cells, and taste buds. Neutral mucins were detected along the esophagus, while acidic mucins were observed in the cranial and middle regions. The stomach featured a simple columnar epithelium with abundant gastric glands and exclusively neutral mucins. Finally, the intestine was characterized by a mucosal tunic of simple cylindrical epithelium composed of enterocytes and goblet cells, abundant folds, and the presence of sulfated and carboxylated neutral and acidic mucins.  Conclusions: P. magdaleniatum exhibited a relatively short intestine for its size and weight. The histology of the gastrointestinal tract further supports adaptations for a protein-rich diet. These findings provide valuable insights for understanding the digestive physiology of this endangered species, which may inform conservation efforts and management strategies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Pseudoplatystoma magdaleniatum, comúnmente conocido como bagre rayado, es una especie endémica de la cuenca del río Magdalena, caracterizada por su gran tamaño y alto valor comercial. Dada su crítica amenaza debido a la sobrepesca, comprender la morfología de su tracto gastrointestinal es crucial para los esfuerzos de conservación y manejo en programas de repoblación de peces.  Objetivo:  Caracterizar la morfología, histología e histoquímica del tracto gastrointestinal de P. magdaleniatum, una especie de pez endémica en la cuenca del río Magdalena, Colombia.  Métodos:  Se capturaron 22 individuos adultos y se tomaron medidas de altura y peso corporal, así como de los órganos que componen el tracto digestivo (esófago, estómago e intestino), y órganos accesorios y glandulares (hígado y gónadas). Se realizaron técnicas histológicas, como tinción de Hematoxilina y Eosina, para caracterizar estructuralmente los órganos. Se emplearon técnicas histoquímicas para describir la dinámica de las mucinas, y microscopia electrónica de transmisión.  Resultados:  El estómago e intestino exhibieron cuatro capas: mucosa, submucosa (ausente en el esófago), muscular y serosa. El esófago, con solo tres capas, se caracterizó por la presencia de epitelio escamoso estratificado con células caliciformes, células en copa y botones gustativos. Se detectaron mucinas neutras en el esófago, y las mucinas ácidas se observaron en las regiones craneal y media. El estómago presentaba un epitelio columnar simple con abundantes glándulas gástricas y mucinas neutras. Finalmente, el intestino se caracterizó por una túnica mucosa de epitelio cilíndrico simple compuesto por enterocitos y células caliciformes, pliegues abundantes y la presencia de mucinas neutras y ácidas sulfatadas y carboxiladas.  Conclusiones: P. magdaleniatum mostró un intestino corto en relación con su tamaño y peso. La histología del tracto gastrointestinal respalda las adaptaciones para una dieta rica en proteínas. Estos hallazgos proporcionan valiosas ideas para comprender la fisiología digestiva de esta especie en peligro de extinción, lo que puede informar los esfuerzos de conservación y las estrategias de manejo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[fish]]></kwd>
<kwd lng="en"><![CDATA[Siluriformes]]></kwd>
<kwd lng="en"><![CDATA[histology]]></kwd>
<kwd lng="en"><![CDATA[histochemistry]]></kwd>
<kwd lng="en"><![CDATA[goblet cells]]></kwd>
<kwd lng="en"><![CDATA[mucins]]></kwd>
<kwd lng="en"><![CDATA[digestive physiology]]></kwd>
<kwd lng="en"><![CDATA[Magdalena River basin.]]></kwd>
<kwd lng="es"><![CDATA[pez]]></kwd>
<kwd lng="es"><![CDATA[siluriformes]]></kwd>
<kwd lng="es"><![CDATA[histología]]></kwd>
<kwd lng="es"><![CDATA[histoquímica]]></kwd>
<kwd lng="es"><![CDATA[células caliciformes]]></kwd>
<kwd lng="es"><![CDATA[mucinas]]></kwd>
<kwd lng="es"><![CDATA[fisiología digestiva]]></kwd>
<kwd lng="es"><![CDATA[cuenca del río Magdalena.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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