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Postembryonic development of intestinal epithelium of masu salmon oncorhynchus masou



Postembryonic development of intestinal epithelium of masu salmon oncorhynchus masou



Bulletin of Tohoku National Fisheries Research Institute (46): 1-14



Morphological and functional changes in the intestinal epithelia of masu salmon (O. masou) were investigated in relation to the development of other digestive organs. The digestive mechanisms during early life stages were described. Almost all digestive organs differentiated 20-25 days after hatching and the fry at the stage of feeding commencement had the adult-like digestive system. The fundamental pattern of the mucosal folds of the anteromedian intestine was formed 30-40 days after hatching. This pattern was composed of simple initial primary folds. The pattern of the rectal mucosal folds developed up until a year, and was completed in yearling smolts. This pattern was composed of the initial and latter primary folds, each with branched secondary folds on its lateral sides. The ability of protein ingestion by the rectal epithelium cells appeared 12-13 days after hatching and was maintained for .apprx. 1 yr. These epithelial cells were characterized by the presence of vigorous pinocytotic features at the base of microvilli and vacuolated supranuclear areas. In spite of the high activity of protein ingestion, no food proteins were detected inside these cells. Instead, the supranuclear vacuoles were filled with flocculent materials. Intracellular digestion of protein molecules by the rectal cells was not essential to the fry as a way of nourishment. The fry of masu salmon digest and absorb foods in the same manner as in adults.

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Accession: 006153995

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