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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.11.17f243e5d0-a75c-4bde-9cf1-da628bb27ae8
名前 / ファイル | ライセンス | アクション |
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KJ00005673806.pdf (404.1 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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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× Magtoon, Wichian× Nagahama, Yoshitaka× Sasayama, Yuichi |
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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 | ||||||
内容記述タイプ | Abstract | |||||
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 | |||||
出版者 | ||||||
出版者 | Laboratory of Freshwater Fish Stocks Bioscience and Biotechnology Center Nagoya University | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | 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 |
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フォーマット | ||||||
値 | application/pdf | |||||
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値 | publisher | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/13833 | |||||
識別子タイプ | HDL |