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Gonadal morphology in the self-fertilizing mangrove killifish, Kryptolebias marmoratus


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Title: Gonadal morphology in the self-fertilizing mangrove killifish, Kryptolebias marmoratus
Other Titles: 自家受精魚マングローブキリフィッシュ(Kryptolebias marmoratus)の生殖腺の 形態
Authors: Sakakura, Yoshitaka / Soyano, Kiyoshi / Noakes, David L.G. / Hagiwara, Atsushi
Authors (alternative): 阪倉, 良孝 / 征矢野, 清 / 萩原, 篤志
Issue Date: Nov-2006
Publisher: 日本魚類学会 / Ichthyological Society of Japan
Citation: Ichthyological Research, 53(4), pp.427-430; 2006
Abstract: We conducted anatomical and histological observations of the gonads in the self-fertilizing mangrove killifish, Kryptolebias marmoratus to investigate the self-fertilizing mechanism of this species. The gonad has a bilobed structure. The elongated gonadal lumen (GL) along the dorsal surface of the gonad connects to the common genital sinus. The elongate testicular region is closely attached to the GL. Among the ovulated eggs in the GL, those in the anterior part of the GL have micropyles but no perivitelline space (are not yet fertilized), whereas those in the posterior part of the GL are fertilized. In our histological analysis, we found free sperm in the posterior area of the GL. We conclude that ovulated eggs may be self-fertilized in the posterior GL. / マングローブキリフィッシュ(Kryptolebias marmoratus)の生殖腺の解剖学および組織学的な観察を行い,本種の自家受精機構を考察した。生殖腺は二葉に分かれ,生殖管は生殖腺背面を通り泌尿生殖口へ達した。精巣組織は生殖管に隣接していた。生殖管内に排卵された卵のうち,生殖管前方の卵には囲卵腔がなく卵門を有しており未受精であったが,生殖管後方の卵は受精していた。組織学的観察から,生殖管後方で排精の起こっていることが明らかとなった。排卵後に卵が生殖管を通る段階で自家受精が起こると考えられた。
Keywords: Gonad / Hermaphrodite / Histology / Rivulus marmoratus / Self-fertilization
URI: http://hdl.handle.net/10069/35713
ISSN: 13418998
DOI: 10.1007/s10228-006-0362-2
Rights: © The Ichthyological Society of Japan 2006. / The final publication is available at link.springer.com
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/35713

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