Ichthyological Research

, Volume 60, Issue 1, pp 85–88 | Cite as

Ovarian structure and mode of egg production in the seaweed pipefish Syngnathus schlegeli (Syngnathidae)

  • Atsushi Sogabe
  • Hiromi Takata
  • Yasuhisa Kobayashi
Short Report


This study investigated ovarian structure and mode of egg production in the seaweed pipefish, Syngnathus schlegeli. The ovary had a rolled sheet-like structure where developing follicles were arranged serially in sequence according to their development, with a single germinal ridge running along the edge of the sheet. Oocytes of various developmental stages were concomitantly present in the ovary, and the number of mature eggs increased continuously over time, indicating that egg production is asynchronous. This would be a physiological basis for multiple spawning within a short time span associated with polygamy in this fish.


Oogenesis Spawning Syngnathus schlegeli Syngnathidae Mating system 



We are grateful to S. Iwasaki for technical support in field and laboratory work. We thank K. Hidaka, H. Issiki, Y. Kamimura, H. Kinoshita, T. Morita, Y. Nakata, E. Sawai, J. Shoji, and A. Tada for their help in collecting fish. We also thank S. Watanabe for technical advice for rearing fish, J. Shibata for advice on statistical analyses, and anonymous reviewers for helpful comments. This research was supported by the Japan Society for the Promotion of Science for Young Scientists to A.S.

Supplementary material

10228_2012_313_MOESM1_ESM.pdf (734 kb)
Supplementary material 1 (PDF 734 kb)


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Copyright information

© The Ichthyological Society of Japan 2012

Authors and Affiliations

  • Atsushi Sogabe
    • 1
    • 4
  • Hiromi Takata
    • 2
  • Yasuhisa Kobayashi
    • 3
  1. 1.Graduate School of Biosphere ScienceHiroshima UniversityHigashi-HiroshimaJapan
  2. 2.Graduate School of Science and EngineeringEhime UniversityMatsuyamaJapan
  3. 3.Sesoko Station, Tropical Biosphere Research CenterUniversity of the RyukyusMotobuJapan
  4. 4.Research Center for Marine Biology, AsamushiTohoku UniversityAsamushiJapan

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