Histological evidence of lunar-synchronized ovarian development and spawning in the spiny rabbitfish <italic>Siganus spinus</italic> (Linnaeus) around the Ryukyus.

DOI Web Site 被引用文献12件 参考文献23件
  • HARAHAP AGUSTINUS P
    Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus
  • TAKEMURA AKIHIRO
    Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus
  • NAKAMURA SHIGEO
    Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus
  • RAHMAN SAYDUR
    Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus
  • TAKANO KAZUNORI
    Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus

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  • Histological evidence of lunar-synchronized ovarian development and spawning in the spiny rabbitfish Siganus spinus (Linnaeus) around the Ryukyus.

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説明

This study clarifies the annual reproductive cycle and the lunar-synchronized spawning of the spiny rabbitfish (Siganus spinus) that inhabit the Okinawan waters. Annual and weekly changes in the gonadosomatic index (GSI) and the histological features of the ovaries were checked. Gonadosomatic index was high during the months of May to July, and yolk-laden oocytes were observed in the ovaries from March to July. Some of the ovaries collected during June and July contained oocytes at maturation stage or ovulatory follicles. These results suggest that the spiny rabbitfish undergo active vitellogenesis and spawning from May to July. During the reproductive season (May to July), collection of fish according to the lunar phase revealed that a high GSI occurred around the time of the new moon. Cyclic oocyte development with peaks around the time of the same moon phase was also observed, suggesting that, in Okinawan waters, this species is a lunar-synchronized spawner and spawns three times.

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