Endocrine control of diurnal oocyte maturation in the kyusen wrasse, Halichoeres poecilopterus

Michiya Matsuyama, Shin Onozato, Masaaki Kashiwagi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The present study examined diurnal cycles of oocyte development and maturation in the kyusen wrasse, Halichoeres poecilopterus, and investigated the sensitivity of oocytes to maturation-inducing hormone (MIH) and gonadotropic hormone (GTH). Female fish were sampled at fixed intervals throughout the day, revealing that final oocyte maturation and ovulation were completed by 6:00 hr, and that spawning occurred daily between 6:00 and 9:00 hr. In vitro experiments showed that the steroids 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) and 17,20β,21-trihydroxy-4-pregnen-3-one (20β-S) were equally potent and highly effective inducers of germinal vesicle breakdown (GVBD) in kyusen wrasse oocytes. Additionally, circulating levels of 17,20β-P and 20β-S increased around the rime of GVBD and ovulation, suggesting that 17,20β-P and 20β-S act as MIHs in the kyusen wrasse. Moreover, in vitro experiments clearly showed that kyusen wrasse oocytes had a daily developmental cycle of GTH and MIH sensitivity, and that oocytes that completed vitellogenesis acquired GTH-induced maturational competence. Ah endogenous GTH surge likely occurs between 12:00 and 15:00 hr, and this daily pre-maturational GTH surge probably controls the diurnal maturation cycles of kyusen wrasse oocytes.

Original languageEnglish
Pages (from-to)1045-1053
Number of pages9
JournalZoological science
Volume19
Issue number9
DOIs
Publication statusPublished - Sep 1 2002

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Labridae
oocytes
hormones
germinal vesicle
ovulation
vitellogenesis
Halichoeres
steroids
spawning
fish

All Science Journal Classification (ASJC) codes

  • Animal Science and Zoology

Cite this

Endocrine control of diurnal oocyte maturation in the kyusen wrasse, Halichoeres poecilopterus. / Matsuyama, Michiya; Onozato, Shin; Kashiwagi, Masaaki.

In: Zoological science, Vol. 19, No. 9, 01.09.2002, p. 1045-1053.

Research output: Contribution to journalArticle

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