<?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>S0034-77442022000100307</article-id>
<article-id pub-id-type="doi">10.15517/rev.biol.trop..v70i1.48957</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Anatomy and histology of the digestive tract and immunolocalization of Npy in the fish Cichlasoma dimerus (Cichliformes: Cichlidae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Anatomía e histología del tracto digestivo e inmunolocalización del Npy (péptido orexigénico) en el pez Cichlasoma dimerus (Cichliformes: Cichlidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Breccia]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palmieri]]></surname>
<given-names><![CDATA[Mónica-Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Di-Yorio]]></surname>
<given-names><![CDATA[María-Paula]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Battista]]></surname>
<given-names><![CDATA[Ariadna-Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vissio]]></surname>
<given-names><![CDATA[Paula-Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Sirkin]]></surname>
<given-names><![CDATA[Daniela-Irina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Buenos Aires Facultad de Ciencias Exactas y Naturales Departamento de Biodiversidad y Biología Experimental]]></institution>
<addr-line><![CDATA[ Buenos Aires]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA)]]></institution>
<addr-line><![CDATA[ Buenos Aires]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>70</volume>
<numero>1</numero>
<fpage>307</fpage>
<lpage>318</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442022000100307&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442022000100307&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442022000100307&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The digestive tract of Neotropical cichlids has not been deeply studied, and it is a fundamental topic for understanding fish physiology, nutrition, trophic associations, and evolution.  Objective:  To describe anatomically and histologically the digestive tract of the Neotropical cichlid fish Cichlasoma dimerus and to immunolocalize the orexigenic peptide (Npy) along the intestine.  Methods:  We euthanized 14 adult individuals and fixed the organs in Bouins solution; we stained 7 &#956;m thick paraffin sections for general description and with Alcian Blue (pH = 2.5, AB) and Periodic acid-Schiff (PAS) to identify acid or neutral glycoconjugates, respectively. Additionally, we performed immunohistochemistry for Npy in 3 adult individuals. We manually counted PAS- and AB-positive cells, and Npy-immunoreactive cells per fold.  Results:  There is a short oesophagus, a sac-like stomach, and a tubular intestine with two loops. The oesophagus has a stratified epithelium with a high density of PAS- and AB-positive goblet cells and striated muscle fibers in the tunica muscularis. The stomach mucosa is formed by simple columnar epithelium. The intestine has a simple columnar epithelium, with brush border and interspersed PAS- and AB-positive goblet cells, and Npy-immunoreactive cells. There is an ileorectal valve in the transition between the posterior intestine and the rectum. This last gut portion has goblet cells and a thicker tunica muscularis.  Conclusions: C. dimerus shares features with other Neotropical cichlids, but the goblet cells and gastric glands distribution seems to be unique for the species. To our understanding, this is the first work to describe Npy-immunoreactive cells distribution in the intestine of a Neotropical cichlid fish.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El tracto digestivo de los cíclidos neotropicales no ha sido profundamente estudiado y es un tema fundamental para entender la fisiología, nutrición, asociaciones tróficas y evolución de los peces.  Objetivo:  Describir anatómica e histológicamente el tracto digestivo del pez cíclido neotropical Cichlasoma dimerus e inmunolocalizar el péptido orexigénico (Npy) a lo largo del intestino.  Métodos:  Sacrificamos 14 individuos adultos y fijamos los órganos en solución de Bouin; teñimos secciones de parafina de 7 &#956;m de espesor para una descripción general y con azul alcián (pH = 2.5, AB) y ácido periódico-Schiff (PAS) para identificar glicoconjugados ácidos o neutros, respectivamente. Además, en 3 individuos adultos se realizaron inmunohistoquímicas contra Npy. Contamos manualmente las células PAS y AB positivas, y las células inmunorreactivas a Npy por pliegue.  Resultados:  Hay un esófago corto, un estómago en forma de saco y un intestino con dos vueltas. El esófago tiene un epitelio estratificado con una alta densidad de células caliciformes PAS- y AB- positivas y fibras esqueléticas estriadas en las capas musculares. La mucosa del estómago está revestida por epitelio simple cilíndrico. El epitelio intestinal es simple cilíndrico con chapa estriada y células caliciformes PAS- y AB- positivas intercaladas, y células inmunorreactivas a Npy. Hay una válvula ileorrectal en la transición entre el intestino posterior y el recto. Esta última porción intestinal tiene células caliciformes y una túnica muscular más gruesa.  Conclusiones:  C. dimerus comparte características con otros cíclidos neotropicales, pero la distribución de las células caliciformes y las glándulas gástricas, serían rasgos propios de esta especie. A nuestro entender, este es el primer trabajo que describe la distribución de células inmunorreactivas a Npy en el intestino de un pez cíclido neotropical.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[goblet cells]]></kwd>
<kwd lng="en"><![CDATA[histomorphology]]></kwd>
<kwd lng="en"><![CDATA[histochemistry]]></kwd>
<kwd lng="en"><![CDATA[immunohistochemistry]]></kwd>
<kwd lng="en"><![CDATA[neotropical cichlids.]]></kwd>
<kwd lng="es"><![CDATA[células caliciformes]]></kwd>
<kwd lng="es"><![CDATA[histomorfología]]></kwd>
<kwd lng="es"><![CDATA[histoquímica]]></kwd>
<kwd lng="es"><![CDATA[inmunohistoquímica]]></kwd>
<kwd lng="es"><![CDATA[cíclidos neotropicales.]]></kwd>
</kwd-group>
</article-meta>
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