Sex Control of the Japanese Eel by an Estrogen(DES-Na) in Feed.

スポンサーリンク

概要

• 論文の詳細を見る

• The sex of the Japanese eel could be controlled by the oral administration of DES-Na (sodium diethylstilbestrol) which also promoted growth. Elvers were reared from glass eels for more than 500 days with a commercial feed which contained DES-Na (0, 0.5, 0.75, 1.0ppm). All the eels were dissected at the end of the experiment to check the sex by both external appearance and histological examinations of gonads. The sex groups were divided into male, male?, female, female? and unknown by their external appearance, and into male, female, hermaphrodite, and non-sex by histo-logical examination. The largest discrepancy (27.5%) in the two examinations was found in the male: the histological examination was found to be essential. The female ratio increased along with an increase in DES-Na. It was 7.7% in the control and 23.2-35.4% in DES-Na groups. The male ratio was 64.1% in the control and 32.0-40.4% in DES-Na groups. The hermaphrodite ratio was 1.1-4.6%, and the non-sexual ratio was 23.8-38.0%. Females were the largest of all sex groups. The growth promoting effect was found to vary with the growth stage.

著者

• 佐藤 英雄

  東京大学農学部水産動物学教室

• 日比谷 京

  東京大学名誉教授

• 二村 義八郎

  東京大学農学部水産学科

• 佐藤 英雄

  東京大学農学部附属水産実験所

• 佐藤 英雄

  東京大学農学部付属水産実験所

関連論文

• ウナギの生殖腺の成熟に関する研究-I : 性分化および生殖腺の成熟過程
• Changes in the chitinase activity at different stages of red sea bream Pagrus major egg, larva, and juvenile.
• Sex Control of the Japanese Eel by an Estrogen(DES-Na) in Feed.
• Growth promotion in Japanese eel by the oral administration of an estrogen (diethylstilbestrol).
• ニホンウナギの産卵誘発〔英文〕
• シロギスの産卵リズムに及ぼす光周期と水温の影響
• ヤマメの肝腫瘍について〔英文〕
• 合成LH-放出ホルモンによるマコガレイおよびマハゼの排卵誘発について
• 遊離アルギニンの酵素分解を併用した筋中ホスホアルギニンの定量法〔英文〕

スポンサーリンク