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- W2107325356 abstract "Abstract The morphological and physiological development of the intestine, stomach, liver and pancreas of the African catfish, Clarius guriepinus (Burchell 1822), was investigated from hatching until 9 days after the start of exogenous feeding by histological, histochemical and immunohistochemical procedures. During the yolk sac period, lasting 48 hours at 30 C, the digestive system develops from a rather undifferentiated system into a distinct liver and pancreas and a segmented intestine (parts I to III). Insulin and glucagon producing cells were clearly found in the endocrine pancreatic islets from 14 hours after hatching onwards, while at the start of exogenous feeding, the exocrine pancreas showed an intense zymogen colouration. Exogenous feeding started three days after fertilization, i.e., 48 hours after hatching. At that moment, the rearing temperature was lowered to 27.5 C. The first day of feeding was referred to as day zero, changing into day 1 when the first 24 hours of feeding were completed. From the start of exogenous feeding onwards, aminopeptidase, non‐specific esterase and ATP‐ase were detected in the digestive system. Morphologically, the stomach was completed at day 4 of exogenous feeding. Gastric acid secretion started on day 4 and lead to a pH below 3.3 in the stomach on day 5. During the first four days of exogenous feeding, C‐t‐gastrin immunopositive cells were found throughout the gut, including the gastric epithelium. After day 4, the C‐t‐gastrin cells were only detected in the anterior intestine. The completeness of the stomach development was also marked by the appearance of non‐specific esterase activity in the stomach epithelial cells on day 5. All data together clearly indicate that in Clarius gariepinus , the ontogeny of a functional digestive system has been completed on day 5 after the start of exogenous feeding, marking thereby the end of the larval period." @default.
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- W2107325356 date "1992-12-01" @default.
- W2107325356 modified "2023-10-16" @default.
- W2107325356 title "The Development of a Functional Digestive System in the African Catfish Clarias gariepinus (Burchell)" @default.
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- W2107325356 doi "https://doi.org/10.1111/j.1749-7345.1992.tb00792.x" @default.
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