Sexual Difference in Histology of the Ultimobranchial Gland of Mature Japanese Eels(Anguilla japonica)(短報)

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The ultimobranchial glands of artificially matured Japanese eels (Anguilla japonica) were examined histologically. The sexual maturation of male and female fish was induced by injections of synahorin and a salmon pituitary extract, respectively, In mature males, the gland cells were low in height with ovoid nuclei. In contrast, cellular hypertrophy and hyperplasia of the gland was observed in mature females. The gland of the mature female had an epithelium with complex enfoldings into the central cavity, tall gland cells with elongated nuclei and well-developed blood capillaries surrounding the parenchyma. The higher blood calcitonin concentration observed by others in mature female and the hyperactivation of the ultimobranchial glands described here lead to the conclusion that the gland plays a significant sex-related role.
1977-09-25