Effects of castration and administration of methyl-testosterone on the nuptial coloration of the medaka, <I>Oryzias latipes</I>
スポンサーリンク
概要
- 論文の詳細を見る
1. In the breeding-season, fully grown males of the wild medaka (<I>Oryzias latipes</I>) display several black stripes in the caudal fin and black spots in the ventral fin become more numerous than those of females. Orange-red color along the dorsal and ventral margins of the caudal fin in the male becomes deeper than in the female. These characters may be called the nuptial coloration and are due to increase in number of melanophores and xanthophores. Full-grown females display no nuptial coloration in the breeding-season.<BR>2. Two kinds of chromatophores of the male caudal fins and the melanophores of the male ventral fins decrease both in number and quantity of the pigments by the orchotomy and thus the nuptial coloration disappears. On the other hand, the ovariotomy induces no significant change in coloration.<BR>3. The subcutaneous administration of methyl-testosterone to the ovariotomized and the normal females induces the manifestation of the nuptial coloration, i.e., the melanophores and the xanthophores in the caudal fin and the melanophores in the ventral fin increase to the level of normal males.<BR>4. The transplantation of the testis into a normal female induces artificial production of the nuptial coloration.<BR>5. It is concluded that the nuptial coloration of the wild medaka (<I>Oryzias latipes</I>) is manifested by the action of the male hormone from the active testis in the breeding season and the female hormone has no effect on the manifestation of the nuptial coloration.
- 日本魚類学会の論文
日本魚類学会 | 論文
- スジシマドジョウ小型種と大型種の急減
- スジシマドジョウ種群における地方的分化〔英文〕
- マアジの卵発生と初期発育
- 摂餌または飢餓状態のブリ仔魚における消化器官の組織学的構造と機能について
- ニジマス(Oncorhynchus mykiss)の胆汁カルシウム濃度に及ぼすスタニウス小体抽出物および17β-エストラジオールの影響