Marine Biology

, Volume 159, Issue 10, pp 2333–2347

Third-stage larva shifts host fish from teleost to elasmobranch in the temporary parasitic isopod, Gnathia trimaculata (Crustacea; Gnathiidae)

  • Yuzo Ota
  • Osamu Hoshino
  • Mamiko Hirose
  • Katsuhiko Tanaka
  • Euichi Hirose
Original Paper

DOI: 10.1007/s00227-012-2018-2

Cite this article as:
Ota, Y., Hoshino, O., Hirose, M. et al. Mar Biol (2012) 159: 2333. doi:10.1007/s00227-012-2018-2


The life cycle of the fish ectoparasitic isopod Gnathia trimaculata is described based on both field samplings and laboratory observations. Species identification of the larvae was based on morphological observation and supported by molecular analysis. As the results of field samplings in several sites of southwestern and central Japan (24–34°N, 124–139°E) from 2005–2011, approximately 900 third-stage larvae of G. trimaculata were found on 25 elasmobranch species, and 220 first- and second-stage larvae were found on three teleost species. No third-stage larvae were found on the teleosts, and the larvae of younger stages never infested elasmobranchs. Therefore, G. trimaculata is supposed to shift its host from teleosts to elasmobranchs as it develops. We discuss the developmental periods, life span, distribution, and predation risk of the present species compared with other gnathiid species.

Supplementary material

227_2012_2018_MOESM1_ESM.tif (5.8 mb)
Fig. a. b. Rocky shore of Aki-no-hama, Izu-Oshima Island (TIFF 5918 kb)

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Yuzo Ota
    • 1
  • Osamu Hoshino
    • 2
  • Mamiko Hirose
    • 3
  • Katsuhiko Tanaka
    • 4
  • Euichi Hirose
    • 5
  1. 1.Graduate School of Biosphere ScienceHiroshima UniversityHigashi-HiroshimaJapan
  2. 2.Diving Service ChapOkata, OshimaJapan
  3. 3.Graduate School of Engineering and ScienceUniversity of the RyukyusNishiharaJapan
  4. 4.Global Oceanographic Data CenterJapan Agency for Marine-Earth Science and TechnologyToyohara, NagoJapan
  5. 5.Faculty of ScienceUniversity of the RyukyusNishiharaJapan

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