アユの内分泌腺に関する研究-IV : 経産卵巣における不産出卵の運命と新母卵細胞の形成

概要

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The spent ovaries of Otu-nen Ayu that have survived in the rivers after spawning have been examined cyto-histologically. The problems concerned are: 1. Morphological changes in the ovulation scar in the course of time. 2. The process of regression of unspawned eggs, and particularly, the collapse and ingestion of yolk attacked by the active granulosa or follicular epithelium, the persistence of the oolemma, and the development of atretic follicles. 3. The appearance and descent of young new oocytes found mainly in the hypertrophic lamellar membrane. In the ovary of Ayu the corpora lutea are formed from granulosa both of post-ovulation (=vestige of ovulation) and of pre-ovulation eggs (=atresia of yolk-laden follicles), but production of yellow pigment granules in the ova cavities has not been recognized. It seems likely that the granulosa of pre-ovulation corpora lutea merely play a part in the destruction, transfer, and ingestion of yolk, since there is no clear indication of hormonal secretion. The young ovarian eggs in the spent ovary seems to be new oocytes originating from the residual oogonia, but not the immature reserve-fund eggs nor younger ones reorganized by partial absorption of ooplasm. Whether or not these young oocytes can develop to mature functional eggs is undetermined.
公益社団法人日本水産学会の論文