精巣の季節的変化 (ウバガイの生殖周期に関する組織学的研究-1,2-)

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1. Seasonal changes in the testis of the surf clam, Spisula sachalinensis, collected in Yakumo, southern Hokkaido, were examined histologically. The process of the development of male germ cells was classified into (1) spermatogonium stage, (2) primary spermatocyte stage, (3) secondary spermatocyte stage, (4) spermatid stage, and (5) spermatozoon stage. 2. On the basis of cytological characteristics of process of the development of male germ cells and of the relative amounts of spermatozoa found in a testis, maturational processes of the testis were classified into (1) spent stage, (2) resting stage, (3) early growing stage, (4) late growing stage, (5) maturing stage, and (6) breeding stage. 3. In the testis, active proliferation of spermatogonia is encountered in the months of December and January. Spermatozoa make their appearance in testicular tubules in late January. They come to fill the tubules in April, but actual spermiation occurs in the period from late May to early June. The absorption of germ cells, which remained free in the lumen of the tubule after the completion of spermiation, lasts until late August. The testis is then maintained in the resting phase during the successive months till late November.
社団法人日本水産学会の論文