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    Gross morphology and histology of the alimentary tract of the convict cichlid Amatitlania nigrofasciata (2014)

    Art
    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Autoren
    Hopperdietzel, C (WE 1)
    Hirschberg, R M
    Hünigen, H (WE 1)
    Wolter, J
    Richardson, K
    Plendl, J (WE 1)
    Quelle
    Journal of fish biology; 85(5) — S. 1707–1725
    ISSN: 0022-1112
    Sprache
    Englisch
    Verweise
    DOI: 10.1111/jfb.12530
    Pubmed: 25263750
    Kontakt
    Institut für Veterinär-Anatomie

    Koserstr. 20
    14195 Berlin
    +49 30 838 53555
    anatomie@vetmed.fu-berlin.de

    Abstract / Zusammenfassung

    The primary objectives of this study were to document the macroscopic and histological structure of the alimentary tract (AT) of the convict cichlid Amatitlania nigrofasciata, because there are no data available for this omnivorous freshwater fish of the family Cichlidae. The morphology of the AT of A. nigrofasciata resembles that of related species. While having morphological criteria of the AT typical of most omnivorous fishes, such as a blind sac stomach and medium length intestine, A. nigrofasciata also has some structural peculiarities: the oesophagus is lined by a uniform stratified squamous epithelial layer with interspersed goblet cells along its entire length. Additionally, it has well-developed layers of the tunica muscularis including muscle fibre bundles that ascend into its mucosal folds. Occasionally, taste buds are present. In the transitional area between oesophagus and stomach, a prominent torus-like closure device is present. The mucosa of the stomach cannot be divided into different regions according to mucosal and morphological properties. The simple pattern of intestinal loops of A. nigrofasciata has few variations, irrespective of sex, mass and length of the individual fish. The first segment of the intestine is characterized by the largest mucososerosal ratio and the most complex mucosal surface architecture. A distinction of midgut and hindgut was not possible in A. nigrofasciata due to lack of defining structural components as described for other fish species.