ハゼ科魚類の一生における器官組織の変化-IV. : シロウオの消化器官系

概要

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Digestive organs, such as the intestine, liver and pancreas, of the spawning and spent migratory ice-goby, Leucopsarion Petersi HILGENDOLF, were examined histologically. The intestinal canal of the fish caught in the spawning bed showed much reduction in its cavity. While the mucous epithelium showed pronounced degeneration, the muscular layer and submucosa thickened considerably. In the liver of the marine specimen and of the upstream migrant, a large amount of fat was still accumulated. A rapid and great decrease in the hepatic cells was then brought about in fully mature fish near the spawning bed. Although remarkable atrophy of an exocrine pancreas and decrease in the amount of zymogen granules were detected in fish from the spawning bed and spent fish, no detectable change in the regression of endocrine pancreas was recognized throughout the breeding season. It was noticed that the degree of regression of these organs in the female fish was greater than that inthe male.
公益社団法人日本水産学会の論文