Scanning Electron Microscopy of the Gastrointestinal Tract of Nile Perch (Lates niloticus, Linneaus, 1758)

Namulawa, Victoria Tibenda; Kato, Charles Drago; Nyatia, Edward; Rutaisire, J.; Britz, Peter

doi:10.4067/s0717-95022013000300047

Cited by 5 publications

(8 citation statements)

References 22 publications

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“…Current results showed that, the fingerprint-like microridges observed on the covering epithelium in the mouth cavity of S. rivulatus are similar to those reported in D. dentex (Carrassón and Matallanas, 1994), S. dumerilli (Grau et al, 1992), Rita rita (Yashpal et al, 2006), S. senegalensis (Arellano et al, 2001), C. gariepinus and B. docmak (Harabawy et al, 2008), M. kannume, C. auratus, B. bynni, and S. schall (Baaoom, 2012), O. niloticus , L. niloticus (Namulawa et al, 2013) and O. niloticus and C. gariepinus (Awaad et al, 2014). Those structures may protect the mucosa from mechanical trauma and chain mucous secretions forming lubrificated surface for the food passage (Humbert et al, 1984;Grau et al, 1992;Murray et al, 1994).…”

Section: Discussionsupporting

confidence: 77%

The microstructure of buccal cavity and alimentary canal of Siganus rivulatus: Scanning electron microscope study

Sayed

Mahmoud

Essa

2019

Microscopy Res & Technique

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The microstructure of the oral cavity and alimentary canal of herbivorous fish Siganus rivulatus collected from the Red Sea were investigated by using scanning electron microscope (SEM). The results showed that S. rivulatus has three types of teeth, tri‐cusped, bi‐cusped, and papilliform. A taste bud (Type I) was recorded in the oropharyngeal cavity. Characteristic styles of microridges on the cell's surface inside the buccal cavity were recorded. Also, the distribution of the mucous cells in the lining of the mouth cavity, alimentary canal was observed. Mucosal folds along the distinct parts of alimentary canal, showed characteristic pattern which was complex in the intestinal mucosa. The results concluded that there are characteristic microstructures according to feeding habitat compared with other bony fishes.

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Section: Discussionsupporting

confidence: 77%

The microstructure of buccal cavity and alimentary canal of Siganus rivulatus: Scanning electron microscope study

Sayed

Mahmoud

Essa

2019

Microscopy Res & Technique

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“…To facilitate the passage of food, the surface of esophageal epithelial cells shows fingerprint‐like microridges. These structures also have been described in several teleosts, such as Salmo gairdneri (Sperry and Wassersug, ), Pseudoplatystoma corruscans (Soares et al ., ), Solea senegalensis (Arellano et al ., ), Dentex dentex (Carrassón et al ., ), Lates niloticus (Namulawa et al ., ). According to Uehara et al .…”

Section: Discussionmentioning

confidence: 99%

“…Folds with different orientations were observed in the luminal surface of the fundic region, which probably enable the distension of the stomach during ingestion of large prey and also increase the surface area for digestive activity (Sinha and Chakrabarti, ; Namulawa et al ., ). The gastric surface of H. platyrhynchos presents polyhedron‐shaped cells, similar to those observed in other teleosts such as Anguilla anguilla that has a pentagonal mosaic pattern (Clarke and Witcomb, ), Salmo gairdneri that has square, pentagon, or hexagon cells (Ezeasor and Stokoe, ), Gymnothorax pictus (Takiue and Akiyoshi, ) and Lates niloticus (Namulawa et al ., ) that has polygon‐shaped cells. Moreover, the surface of epithelial cells of the studied species shows secretion granules.…”

Section: Discussionmentioning

confidence: 99%

“…However, variations such as the presence or absence of stomach and pyloric caeca, length and shape of organs, pattern of folds, and epithelial specializations, have been reported. Several studies have used scanning electron microscope to describe the morphology of the digestive tract of teleosts to comprehend the function of specialized structures of each organ in relation to different feeding adaptations (Humbert et al ., ; Grau et al ., ; Soares et al ., ; Mir and Channa, ; Namulawa et al ., ). Another analysis, which has been used by researchers, is the morphometry of the microvilli, allowing infer about of the absorption of nutrients in fish (German et al ., ; Zeng et al ., ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrastructure of the digestive tract in neotropical carnivorous catfish Hemisorubim platyrhynchos (Valenciennes, 1840) (Siluriformes, Pimelodidae)

et al. 2015

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The surface of the digestive tract of Hemisorubim platyrhynchos was analyzed by scanning electron microscopy. Morphometric studies by transmission electron microscopy were performed to analysis the intestinal microvilli. H. platyrhynchos is a Neotropical carnivorous freshwater catfish featuring a short digestive tract composed of a short esophagus, saccular stomach, and intestine with four regions: anterior, middle, posterior, and rectal. The esophageal surface is constituted by fingerprint-like microridges that anchor the mucosubstances secreted by goblet cells facilitating the passage of food. Goblet cells present the opening to the esophageal lumen, between the microridges. Club cells are in basal epithelium and they do not present the opening to the lumen. The gastric luminal surface shows polygon-shaped epithelial cells which secrete granules by exocytose to protect the gastric surface. The intestinal luminal surface reveals folds that are thicker in the anterior intestine than in the posterior intestine, increasing the absorptive surface area. The intestinal surface presents the microvilli of enterocytes and the opening of goblet cells. The morphometric analysis showed that the microvilli are longer in the anterior intestine, significantly decreasing towards the posterior intestine. The microvilli surface area significantly is greater in the anterior and middle intestine than in the posterior intestine. Numerous openings of goblet cells were observed in the posterior intestine acting in epithelial protection and lubrication. SCANNING 38:336-343, 2016. © 2015 Wiley Periodicals, Inc.

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“…It is therefore important to have a prior understanding of the structure of its digestive system, to guide its future potential culture undertakings. Previous studies on Nile perch have focused on its genetics (Mwanja et al, 2012), ecology (OgutuOhwayo, 2004;Nkalubo et al, 2014), population (Downing et al, 2013) and reproduction (Kahwa, 2013), however, limited studies (Namulawa et al, 2013) have engaged the structure of its digestive system. The morphology of the digestive system in fish has been widely studied because this explains the digestive processes including ingestion, food breakdown and absorption (dos Canan et al, 2012;Naguib et al, 2011) Similarly, several investigations (Mir et al, 2012;Hassan, 2013;Vajhi et al, 2013), have been done on the ultrastructure of the digestive system of fish, because these give a detailed anatomical understanding of the system.…”

Section: Introductionmentioning

confidence: 99%

Transmission Electron Microscopy of the Gastrointestinal Tract of Nile Perch Lates niloticus

Namulawa¹,

Kato²,

Nyatia³

et al. 2015

Int. J. Morphol.

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SUMMARY:The ultrastructure of the gastrointestinal tract of Nile perch was described using Transmission Electron Microscopy standard procedures. Investigations revealed the presence of mucous cells, blood vessels and oil droplets plus several nerve cells and muscle bundles in the oral cavity. Further observations revealed columnar epithelial cells in the oesophagus, with a ragged surface, high electron dense cytoplasm, intercellular spaces, mitochondria and mucus granules. The lamina propria of the oesophagus was composed of loose connective tissue, blood vessels, nerve cells and several leucocytes, while the muscularis externa was composed of striated muscle bundles with the a Z line, A band and I band. The stomach was characterized by mucosal glandular cells with electron dense granules, a prominent nucleus, mitochondria, and secretory canaliculi. The liver had an isotropic parenchyma composed of several hepatocytes with a single spherical euchromatic nucleus. The exocrine pancreatic cells in the liver occurred around large blood vessels, had large centrally positioned nuclei with electron dense nucleolus, electron dense granules, Rough Endoplasmic Reticulum, and mitochondria which dominated the cytoplasm of pancreatic cells.

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Scanning Electron Microscopy of the Gastrointestinal Tract of Nile Perch (Lates niloticus, Linneaus, 1758)

Cited by 5 publications

References 22 publications

The microstructure of buccal cavity and alimentary canal of Siganus rivulatus: Scanning electron microscope study

The microstructure of buccal cavity and alimentary canal of Siganus rivulatus: Scanning electron microscope study

Ultrastructure of the digestive tract in neotropical carnivorous catfish Hemisorubim platyrhynchos (Valenciennes, 1840) (Siluriformes, Pimelodidae)

Transmission Electron Microscopy of the Gastrointestinal Tract of Nile Perch Lates niloticus

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