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GTH and GnRH Molecules and Their Expression in the Japanese Eel

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Eel Biology

Abstract

Many aspects in the reproductive cycle of the wild Japanese eel Anguilla japonica remain unclear. Female Japanese eels cultivated in freshwater ponds normally possess immature ovaries in which most developed oocytes are at the previtellogenic stage. Silver eels migrating in rivers or coastal areas toward their spawning grounds (Yamamoto et al. 1974) and eels reared for long terms in seawater ponds (Kagawa et al. 1998) exhibit oocytes at the early vitellogenic stage. However, under ordinary rearing conditions, further development of oocytes is not observed in the Japanese eel. The same phenomenon occurs in the European eel, Anguilla anguilla. The fact that eels do not mature spontaneously under captive conditions is considered to be related to a deficiency of pituitary gonadotropic function (Dufour et al. 1988).

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  1. Yasutoshi Yoshiura

    Present address: Inland Station, National Research Institute of Aquaculture, Tamaki, Mie, 519-0423, Japan

Authors and Affiliations

  1. Fisheries Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Maisaka, Hamana, Shizuoka, 431-0211, Japan

    Hiroaki Suetake

  2. Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657, Japan

    Kataaki Okubo, Yasutoshi Yoshiura & Katsumi Aida

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  1. Hiroaki Suetake
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  1. Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, 113-8657, Bunkyo-ku, Tokyo, Japan

    Katsumi Aida Ph.D. (Professor) (Professor)

  2. Ocean Research Institute, The University of Tokyo, 1-15-1 Minamidai, 164-8639, Nakano-ku, Tokyo, Japan

    Katsumi Tsukamoto Ph.D. (Professor) (Professor)

  3. Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minatomachi, 041-8611, Hakodate, Japan

    Kohei Yamauchi Ph.D. (Professor) (Professor)

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Suetake, H., Okubo, K., Yoshiura, Y., Aida, K. (2003). GTH and GnRH Molecules and Their Expression in the Japanese Eel. In: Aida, K., Tsukamoto, K., Yamauchi, K. (eds) Eel Biology. Springer, Tokyo. https://doi.org/10.1007/978-4-431-65907-5_24

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  • DOI: https://doi.org/10.1007/978-4-431-65907-5_24

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