日本産イワナ属魚類に関する研究-5-ニッコウイワナの膵臓ランゲルハウス氏島〔英文〕

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By using several repeated combinations of stainings, the pancreatic islet tissue of one of the Japanese char, the Nikkô-iwana, Salvelinus leucomaenis pluvius, from mountain tributaries was investigated to elucidate its cellular elements and seasonal changes. A-cells stained strongly with acidic dyes, B-cells with aldehyde fuchsin (or thionin) and iron hematoxylin, and D-cells with basophilic dyes and silver granules were consitently demonstrated. In addition, another type of the argyrophil cells is seen: their cytoplasmic granules show the staining affinities with both those of D-and B-cells. These two kinds of cells in question seem to be identical with amphiphil cells of EPPLE. In spite of careful and repeated examination, there are no clearcut seasonal changes in the ratio of cellular elements in a single islet. On the other hand, a pronounced increase in the number of small islets following the bredding season of the fish is detected. Corelation between the hyperplasia and hypertrophy of the islet tissue and spawning behavior of the fish is intimated.
社団法人日本水産学会の論文