Eel Biology pp 387-399 | Cite as

Induction of Vitellogenesis

  • Narumi Sato
  • Ichiro Kawazoel
  • Yuzuru Suzuki
  • Katsumi Aida


In the Japanese eel Anguilla japonica, oocyte development has not been observed to occur under ordinary rearing conditions. Therefore, hormonal treatment is necessary to induce ovarian maturation artificially. Weekly injections of aqueous extract of salmon pituitaries were generally conducted for inducing vitellogenesis (Yamauchi and Yamamoto 1982). 17,20 ß ß-Dihydroxy-4-pregnen-3-one (DHP) injection is effective for the induction of final oocyte maturation and ovulation after the completion of vitellogenesis (Yamauchi 1990; Ohta et al. 1996). Although the induction of ovarian maturation and fertilization of eggs followed the treatment just mentioned, there are some problems such as variable fertility and hatchability of eggs and low survival rate of larvae. Therefore, it is still necessary to improve the methods of hormonal application in the Japanese eel. We have developed an effective method of salmon gonadotropin (sGTH) application for the induction of vitellogenesis in the Japanese eel, and also investigated the function of sGTH. In this chapter, we summarize our recent studies on the induction of vitellogenesis in the Japanese eel.


Oocyte Diameter Weekly Injection Ovarian Maturation Final Oocyte Maturation Vitellogenin Level 
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Copyright information

© Springer-Verlag Tokyo 2003

Authors and Affiliations

  • Narumi Sato
    • 1
  • Ichiro Kawazoel
    • 1
  • Yuzuru Suzuki
    • 2
  • Katsumi Aida
    • 1
  1. 1.Department of Aquatic Bioscience, Graduate School of Agricultural and Life SciencesThe University of TokyoBunkyoku, TokyoJapan
  2. 2.Fisheries Laboratory, Graduate School of Agricultural and Life SciencesUniversity of TokyoMaisaka, Hamana, ShizuokaJapan

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