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  1. H180 生物機能開発利用研究センター
  2. H180b 紀要
  3. The fish biology journal Medaka
  4. 11

A study of the sex ratio and fin morphometry of the Thai medaka, Oryzias minutillus, inhabiting suburbs of Bangkok, Thailand

https://doi.org/10.18999/fisbjm.11.17
https://doi.org/10.18999/fisbjm.11.17
f243e5d0-a75c-4bde-9cf1-da628bb27ae8
名前 / ファイル ライセンス アクション
KJ00005673806.pdf KJ00005673806.pdf (404.1 kB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2010-06-22
タイトル
タイトル A study of the sex ratio and fin morphometry of the Thai medaka, Oryzias minutillus, inhabiting suburbs of Bangkok, Thailand
言語 en
著者 Ngamniyom, Arin

× Ngamniyom, Arin

WEKO 37892

en Ngamniyom, Arin

Search repository
Magtoon, Wichian

× Magtoon, Wichian

WEKO 37893

en Magtoon, Wichian

Search repository
Nagahama, Yoshitaka

× Nagahama, Yoshitaka

WEKO 37894

en Nagahama, Yoshitaka

Search repository
Sasayama, Yuichi

× Sasayama, Yuichi

WEKO 37895

en Sasayama, Yuichi

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 Laboratory of Freshwater Fish Stocks Bioscience and Biotechnology Center Nagoya University
権利
言語 ja
権利情報 本文データは学協会の許諾に基づきCiNiiから複製したものである
キーワード
主題Scheme Other
主題 Thai medaka
キーワード
主題Scheme Other
主題 sex ratio
キーワード
主題Scheme Other
主題 sex-undeterminable
抄録
内容記述 Thai medaka were collected from 10 localities in the suburbs of Bangkok, Thailand. The sex ratios (male to female) were almost 1:1 in localities 1, 2, 4, 5, 7, and 9 and seemed to be normal. In contrast, in localities 3, 6, 8, and 10, the sex ratios were unbalanced; they were 1:2.9, 1:3.4, 1:3.0, and 1:2.8, respectively. Furthermore, irrespective of the normal or abnormal sex ratios, many individuals whose morphological characteristics did not identify them as males or females were found. The indexes showing the secondary sex characters of the sex-undeterminable individuals, namely, the values (%) of dorsal fin height (HD) divided by standard length (SL) and anal fin height (HA) divided by SL were between the values of normal males and normal females. From the sediment of two ponds in which the sex ratio was unbalanced, a low level of DDT was detected. Although no hermaphrodite gonads were histologically found from those sex-undeterminable individuals, it may be noted that the number of individuals which had testes was almost twice that of those with ovaries. Taking these results into considerations, it is surmised that some feminizing stresses may be triggered in males of the Thai medaka, probably by artificial chemicals.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 Laboratory of Freshwater Fish Stocks Bioscience and Biotechnology Center Nagoya University
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ID登録
ID登録 10.18999/fisbjm.11.17
ID登録タイプ JaLC
関連情報
関連タイプ isVersionOf
識別子タイプ URI
関連識別子 http://ci.nii.ac.jp/naid/110007349053/
書誌情報 en : The Fish Biology Journal Medaka

巻 11, p. 17-21, 発行日 2007
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/13833
識別子タイプ HDL
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