scholarly journals Eco-Histopathology of Nile Tilapia (Oreochromis niloticus) and African Catfish (Clarias gariepinus) from Industrially Contaminated Locations of Ologe Lagoon, South-western, Nigeria

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Akintade O Adeboyejo ◽  
Adedapo O Fagbenro ◽  
Yemisi E Adeparusi ◽  
Edwin O Clarke ◽  
Oladidupo Lawal ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Clarias Gariepinus ◽  
African Catfish ◽  
Nile Tilapia Oreochromis Niloticus

scholarly journals Clock‐Controlled Endogenous Melatonin Rhythms in Nile Tilapia (Oreochromis niloticus niloticus) and African Catfish (Clarias gariepinus)

2008 ◽  
Vol 25 (1) ◽  
pp. 31-49 ◽  
Author(s):  
Carlos Christian Martinez‐Chavez ◽  
Sammi Al‐Khamees ◽  
Antonio Campos‐Mendoza ◽  
David James Penman ◽  
Herve Migaud
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Clarias Gariepinus ◽  
African Catfish ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Endogenous Melatonin

scholarly journals Comparative Histomorphological and Histochemical Studies on the Oesophagus of Nile Tilapia Oreochromis niloticus and African Catfish Clarias gariepinus

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ashraf Sayed Awaad ◽  
Usama Kamal Moawad ◽  
Mohamed Gomaa Tawfiek
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Feeding Habits ◽  
Periodic Acid ◽  
Clarias Gariepinus ◽  
African Catfish ◽  
Epithelial Surface ◽  
Oesophageal Mucosa ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Mucosal Folds

The present work aimed to describe and compare both gross and microscopic structure of the oesophagus of Nile tilapia (Oreochromis niloticus) and African catfish (Clarias gariepinus). For this purpose, 60 specimens of oesophagus of Nile tilapia (omnivorous fish) and African catfish (carnivorous fish) were collected and processed. Anatomically, the oesophagus of both species appeared as a short tube with longitudinal mucosal folds. Using scanning electron microscope, the epithelial surface of the esophagus showed primary and secondary mucosal folds in both species while tertiary folds were observed in that of tilapia only. Histologically, the oesophagus consisted of four distinct layers: mucosa, submucosa, muscularis, and serosa. The oesophageal mucosa consisted of stratified epithelium with few mucous secreting cells in catfish and many mucous secreting cells in tilapia. Two types of mucous secreting cells reacted positively with both periodic acid shiff (PAS) and alcian blue (AB); rounded and elongated cells that were recognized in the esophageal epithelium of tilapia and only elongated oval cells were observed in that of catfish. In conclusion, the obtained histomorphological differences in esophagus of both fish species may be attributed to their different feeding habits and type of food.

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