Ocean Science Journal

, Volume 53, Issue 2, pp 239–249 | Cite as

Tide-related Changes in mRNA Abundance of Aromatases and Estrogen Receptors in the Ovary and Brain of the Threespot Wrasse Halichoeres trimaculatus

  • Dae-Ju Oh
  • Sung-Pyo HurEmail author
  • Selma Bouchekioua
  • Yuki Takeuchi
  • Shingo Udagawa
  • Neelakanteswar Aluru
  • Yong-Ju Park
  • Ji-Gweon Park
  • Se-Jae Kim
  • Thomas W. Moon
  • Mathilakath M. Vijayan
  • Akihiro Takemura


The threespot wrasse (Halichoeres trimaculatus; Family Labridae) is a common coral reef species of the Indo-Pacific Ocean. Given that this species spawns daily at high tide (HT), we hypothesized that endocrine changes in relation to gonadal development are synchronized with the tidal cycle. To test this, we examined the transcript abundance of two cytochrome P450 aromatases (cyp19a and cyp19b) and two estrogen receptors (erα and erβ) in the ovary and brain of this species in response to tidal change. When fish were collected around four tidal points [low tide (LT), flood tide (FT), high tide (HT), and ebb tide (ET)], gonadosomatic index and oocyte diameter increased around HT and FT, respectively. Ovulatory follicles were observed in ovaries around HT. Real-time quantitative polymerase-chain reaction revealed that mRNA abundance of cyp19a and erα, but not erβ, in the ovary increased around ET and HT, respectively. On the other hand, mRNA levels of cyp19b in the forebrain were significantly higher around FT. Increases of erα and erβ mRNA abundance around FT were observed in all areas of the brain and the midbrain, respectively. The changes in mRNA abundance of key genes involved in reproduction at specific tidal cycles, along with the development of the vitellogenic oocytes in the ovary, support our hypothesis that synchronization of endocrine changes to the tidal periodicity plays a role in the gonadal development of this species. We hypothesize that conversion of testosterone to E2 in the brain may be associated with the spawning behavior given that the wrasse exhibits group spawning with a territory-holding male around HT.


aromatase brain estrogen receptor ovary tide wrasse 


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Copyright information

© Korea Institute of Ocean Science & Technology (KIOST) and the Korean Society of Oceanography (KSO) and Springer Nature B.V. 2018

Authors and Affiliations

  • Dae-Ju Oh
    • 1
  • Sung-Pyo Hur
    • 2
    Email author
  • Selma Bouchekioua
    • 3
  • Yuki Takeuchi
    • 3
  • Shingo Udagawa
    • 3
  • Neelakanteswar Aluru
    • 5
  • Yong-Ju Park
    • 3
  • Ji-Gweon Park
    • 1
  • Se-Jae Kim
    • 4
  • Thomas W. Moon
    • 6
  • Mathilakath M. Vijayan
    • 7
  • Akihiro Takemura
    • 3
  1. 1.Jeju Biodiversity Research InstituteJeju TechnoparkSeogwipoKorea
  2. 2.Jeju Environment Research Section, Jeju International Marine Science Research & Logistics CenterKIOSTJejuKorea
  3. 3.Department of Chemistry, Biology and Marine Science, Faculty of ScienceUniversity of the RyukyusOkinawaJapan
  4. 4.Department of Biology, College of Natural SciencesJeju National UniversityJejuKorea
  5. 5.Biology DepartmentWoods Hole Oceanographic InstitutionWoods HoleUSA
  6. 6.Department of BiologyUniversity of OttawaOttawaCanada
  7. 7.Department of Biological SciencesUniversity of CalgaryCalgaryCanada

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