Morphological characterisation of the digestive tract of the catfish Lophiosilurus alexandri Steindachner, 1876 (Siluriformes, Pseudopimelodidae)

Abstract

The anatomical arrangement of the digestive tract and the length (cm) of the oesophagus and intestine of the catfish Lophiosilurus alexandri were described, and the intestinal coefficient was determined. L. alexandri oesophagus is short, in median position, and presents longitudinally folded mucosa, whilst its epithelium is stratified and non-keratinised, with mucous, claviform and epithelial cells. Stomach has "C" shape, with folded mucosa along cardiac region, disordered in the fundic region, and directed to the sphincter in the pyloric region. Its epithelium is simple prismatic, and cardiac and fundic portions have gastric glands. Cranial intestine is formed by pyloric flexure and descending loop attached to the right side of stomach. Middle intestine is winding and positioned to the right of caudal portion of stomach. Caudal intestine is linear and with a median position up to the anus. Intestinal coefficient was 1.39 ± 0.30 cm. Epithelium is simple prismatic with brush border and contains epithelial and goblet cells. Caudal region has highest concentration of goblet cells. Were detected neutral glycoproteins, carboxylated and sulphated acid glycoconjugates for mucous cells and goblet cells, and neutral glycoproteins for the apical region of gastric epithelial cells. Morphological features could be related to piscivorous species feeding habit. K E Y W O R D S catfish, intestinal coefficient, mucosa morphometry, mucosubstances

Distribution of goblet and endocrine cells in the intestine: A comparative study in Amazonian freshwater Tambaqui and hybrid catfish

“…In our study, EC CCK-8+ concentrated more in the first midgut segment of the hybrid catfish (C1). Similar to the hybrid cattish, a higher density of CCK cells/expression in the first midgut segment, closer to stomach pyloric, was also found in 5 from the 9 carnivorous species such as G. morhua (Mello et al, 2017), R. giurinus. (Hur et al, 2016), S. ocellatus (Webb et al, 2010), S. quinqueradiata (Murashita et al, 2006), S.…”

“…undecimalis (Machado et al, 2013), H. platyrhynchos (Faccioli et al, 2014), H. hippoglossus (Murray et al, 1996), L. calcarifer (Purushothaman et al, 2016), P. americanus and P. ferruginea (Murray et al, 1996), L. alexandri (Mello et al, 2017), S. geneionema (Hur et al, 2016), and A. anguilla (Domeneghini et al, 2005). Differently from hybrid catfish, D. dentex (Carrassón et al, 2006) and O. mykiss (Marchetti et al, 2006) showed similar cell distribution with each other.…”

“…Similar to the hybrid cattish, a higher density of CCK cells/expression in the first midgut segment, closer to stomach pyloric, was also found in 5 from the 9 carnivorous species such as G . morhua (Mello et al, ), R . giurinus .…”

Morphological and histochemical features of the digestive tract ofLeiarius marmoratus(Gill, 1870)

“…The serosa layer constitutes both connective tissue and mesothelium (Figure 4c). The short oesophagus shows longitudinal folds that allow great distensibility to facilitate the passage of large food, like fish (Faccioli et al, 2014;Mello et al, 2019;Rodrigues & Cargnin-Ferreira, 2017;Vidal et al, 2020). Oesophageal epithelium of studied species is composed of epithelial cells, goblet cells and club cells.…”

Unique localization of disseminated pancreas in the oesophagus of catfish (clarias gariepinus) with reference to sexual dimorphism

“…Catfish is one of the freshwater teleost fish that live near to the bottom. It is an omnivorous type that has a convoluted tubular gastrointestinal tract (short oesophagus, stomach and followed by intestine) and is known as stomach teleost (Lee et al, 2001;Moawad et al, 2017;Mello et al, 2019). In fish, it has been reported that the alimentary pattern could affect hormonal secretion (Navarro et al, 2002).…”