エストロジェンによるグッピーの性転換

概要

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The young of Lebistes reticulatus were divided into four experimental series, to each of which the diet containing ethiny-estradiol (128.7μg/g) was given. After the discontinuation of estrogen administration they were fed with the normal diet. The terms during which the animals were fed with the hormonic and normal diet are shown in Table 1. The secondary sexual characters of estrogen-fed fishes developed into female type without exception. The effect was kept unchanged during the period of experiment, i.e., from 60 days to 130 days after the discontinuation of the administration. The testicular differentiation of male fishes administered with estrogen were completely suppressed, their gonads being feminized. Sex reversal is indicated by both the overwhelming predominance of female differentiation and the development of the intersexual gonads (Table 2). High mortality in the experimental series-I may not be significant to this conculusion. In the intersexual gonads, the anterior part is ovarial tissue and the posterior region is chiefly composed of testicular constitution (Figs. 3-5). This situation is interesting in connection with two problems, that is, the stability of sex-reversed gonads induced by the hormonic administration and the regional difference in the rate of gonadal differentiation in male L. reticulatus.
1959-08-15