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Ichthyological Research

, Volume 59, Issue 1, pp 77–82 | Cite as

Basic reproductive biology of the barbed pipefish Urocampus nanus (Syngnathidae) under laboratory conditions

  • Atsushi Sogabe
  • Ryota Kawanishi
  • Hiromi Takata
  • Yasuhisa Kobayashi
Short Report

Abstract

The mating behaviour, fecundity characteristics and egg production process were investigated in the barbed pipefish Urocampus nanus under aquarium conditions. The mating behaviour consisted of five motor patterns, some of which have been generally reported in other syngnathids. Neither the number nor size of newborns related to the size of parents, although there was a negative correlation between the number and size of newborns. The ovary consisted of two germinal ridges, and mature eggs were produced synchronously with multiple ovulations. This type of egg production has thus far been reported only in a polyandrous and sex-role-reversed pipefish.

Keywords

Syngnathidae Urocampus nanus Oogenesis Spawning 

Notes

Acknowledgments

We are grateful to S. Iwasaki for technical support in the 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. This research was supported by the Japan Society for the Promotion of Science for Young Scientists to AS.

Supplementary material

Movie S1 Video image of mating behaviour of Urocampus nanus (WMV 59999 kb)

Movie S2 Video image of post-spawning behaviour (wiggling) and egg dumping of male Urocampus nanus (WMV 18154 kb)

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Copyright information

© The Ichthyological Society of Japan 2011

Authors and Affiliations

  • Atsushi Sogabe
    • 1
  • Ryota Kawanishi
    • 2
  • 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

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