State of Testes and Occurrence Frequency of Testis-ova in Japanese Medaka (Oryzias latipes) Exposed to 17β-estradiol - Collections

＜departmental bulletin paper＞
State of Testes and Occurrence Frequency of Testis-ova in Japanese Medaka (Oryzias latipes) Exposed to 17β-estradiol

Creator	Author PID L001415 Creator Name 鶴田, 幸成 Tsuruda, Yukinari ツルダ, ユキナリ Affiliation Affiliation Name 九州大学大学院農学研究院 Faculty of Agriculture, Kyushu University
	Author PID K001575 Creator Name 大嶋, 雄治 Oshima, Yuji オオシマ, ユウジ Affiliation Affiliation Name 九州大学大学院農学研究院 Faculty of Agriculture, Kyushu University
	Creator Name 姜, 益俊 Kang, Ik Joon カン, イクシュン Affiliation Affiliation Name 九州大学大学院農学研究院 Faculty of Agriculture, Kyushu University
	Creator Name 横田, 弘文 Yokota, Hirohumi ヨコタ, ヒロフミ Affiliation Affiliation Name (財)化学物質評価研究機構安全性評価技術研究所 Chemicals Assessment Center, Chamicals Evaluation and Research Institute, Japan
	Author PID K001548 Creator Name 本城, 凡夫 Honjo, Tsuneo ホンジョウ, ツネオ Affiliation Affiliation Name 九州大学大学院農学研究院 Faculty of Agriculture, Kyushu University
	Creator Name 中園, 明信 Nakazono, Akinobu ナカゾノ, アキノブ
Language	Japanese
Publisher	九州大学大学院農学研究院
Publisher	Faculty of Agriculture, Kyushu University
Date	2006-02-01
Source Title	Science bulletin of the Faculty of Agriculture, Kyushu University
Vol	61
Issue	1
First Page	93
Last Page	99
Publication Type	Version of Record
Access Rights	open access
JaLC DOI	https://doi.org/10.15017/4388

File	FileType	Size	Views	Description
p093	pdf	1.13 MB	385

PISSN	1347-0159
NCID	AA11577672
Record ID	4388
Peer-Reviewed	Unrefereed
Notes	Adult medaka (Oryzias latipes) were exposed to 17 beta-estradiol (E2) of the following concentrations 31.3 ng/L, 62.5ng/L, 123ng/L and 250ng/L for 21 days. The state of their testicular as well as the occurrence frequency of testis-ova were examined histologicaly in relation to their fertility. Results show that testis-ova appear in testes of males at all concentrations and their occurence frequency was highest at 62.5ng/L. Each developmental stage of the make germ cell was observed and the spermotazoa were produced actively at 31.3 ng/L, 62.5ng/L, 123ng/L and 250ng/L.. It was concluded that these concentration of E2 had no influence in the fertility of male medaka. At highest concentration (500 ng/L) it was found that the connective tissue was occupying most of the tetiscular tissue and decrease of the numver of the fertility. Although testis-ova were observed, concentrations below 250 ng/L may not give effect fertility of males.
Type	紀要論文
Created Date	2009.04.22
Modified Date	2022.11.11