Fisheries Science

, Volume 78, Issue 1, pp 139–146 | Cite as

Comparison of the amount of thiotrophic symbionts in the deep-sea mussel Bathymodiolus septemdierum under different sulfide levels using fluorescent in situ hybridization

  • Masaru Fujinoki
  • Tomoko Koito
  • Suguru Nemoto
  • Mitsugu Kitada
  • Yoko Yamaguchi
  • Susumu Hyodo
  • Hideki Numanami
  • Nobuyuki Miyazaki
  • Koji InoueEmail author
Original Article Chemistry and Biochemistry


Various invertebrates inhabiting hydrothermal vents harbor thiotrophic endosymbionts that provide the host with nutrients and are possibly involved in the detoxification of harmful sulfides. In this study, we first determined the partial 16S rRNA gene sequence of the thiotrophic symbiont of the deep-sea mussel Bathymodiolus septemdierum, a dominant species at hydrothermal vents in the Izu–Ogasawara (Bonin) area. We then designed a new probe, Bsob692, for fluorescent in situ hybridization (FISH) using regions completely conserved among thiotrophic symbionts of all bathymodiolin mussels and established the protocol for FISH to compare the distribution and amount of the symbiont using an image analysis program that is commercially available. We compared fluorescent intensity in the gill of the mussels collected at different sites and found a higher intensity in specimens collected from a site with higher sulfide concentration. We also compared mussels reared in the presence and absence of sulfide and found that the former had a higher fluorescent intensity.


Chemosynthetic bacteria Fluorescent in situ hybridization (FISH) Hydrothermal vents Sulfide Symbiosis 



We thank the crew of R/V Natsushima and ROV Hyper-Dolphin for their help during the cruise NT08-07. We also thank the crew of Tanshu-Maru. This work was supported by KAKENHI (nos. 19380110 and 22380107).


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Copyright information

© The Japanese Society of Fisheries Science 2011

Authors and Affiliations

  • Masaru Fujinoki
    • 1
    • 2
  • Tomoko Koito
    • 1
    • 2
  • Suguru Nemoto
    • 3
  • Mitsugu Kitada
    • 3
  • Yoko Yamaguchi
    • 2
  • Susumu Hyodo
    • 2
  • Hideki Numanami
    • 4
  • Nobuyuki Miyazaki
    • 1
    • 2
  • Koji Inoue
    • 1
    • 2
    Email author
  1. 1.Graduate School of Frontier SciencesThe University of TokyoKashiwaJapan
  2. 2.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwaJapan
  3. 3.Enoshima AquariumFujisawaJapan
  4. 4.Tokyo Kasei-Gakuin UniversityMachidaJapan

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