澱粉基質膜法によるティラピアおよびブルーギルの消化器官におけるアミラーゼ活性の局在

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概要

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• The purpose of this study is to detect the localization of amylase activity of fish which are possessed of the stomach or both the stomach and the pyloric caeca by a starch substrate film method, and to make clear the question whether other organs than the pancreas are concerned with the secretion of amylase. In Mozambique mouthbrooder amylolytic activity was found in the pancreatic exocrine tissues, at the luminal surfaces and the lumen of the intestine, and at the outer- and outside of the tracts of the stomach and the intestine. In bluegill the activity was found also in the pancreatic exocrine tissues; at the luminal surfaces and the lumen of the esophagus, the stomach, the pyloric caeca and the intestine; and at the outer- and outside of the wall of the pyloric caeca and the intestine. In both the examined species the mucosa and submucosa showed to be amylase-negative throughout the digestive tract. In sections of the pyloric caeca of bluegill and of the intestine of both species, stained with hematoxylin and eosin, pancreatic ramifications were found to be embedded in or adhere to the wall of the tracts. From the present evidences it seems that amylase production is confined to the pancreatic exocrine cells alone and the mucosal epithelial cells of the digestive tract are not associated with production or secretion of amylase. The present results are accordant with those obtained for the carp, a stomachless fish, which was earlier examined.

• 公益社団法人 日本水産学会の論文

著者

• 山根 伸一

  宮崎大学農学部水産増殖学教室

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