老成雌メダカの小突起形成能の保持

概要

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The potency of anal-fin process formation was tested in 0-, 1-and 2-year-old females of d-rR strain^* of the medaka, Oryzias latipes, by means of oral administration of 17α-ethynyltestosterone (ethisterone). The experiment was carried out in winter. The daily increase in the numbers of the processes is plotted in Fig. 1. The processes appeared in all female groups on the 6th day of consecutive ethisterone administration, and the number of the processes increased to approximately 32-35 on the 15th day. The mean number of processes produced was not significantly different among three groups, and no significant differences were found in the number of process-forming rays among three groups (Table 1). From these results, it is suggested that the response of female fish to androgen is maintained invariably in the females regardless of the age.
社団法人日本動物学会の論文
1971-05-15