Eel Biology pp 445-456 | Cite as

Hatching Enzymes in the Japanese Eel

  • Junya Hiroi
  • Shigeki Yasumasu
  • Kouji Kawazu
  • Toyoji Kaneko


Before the hatching of teleost embryos, the egg envelope (chorion) is digested by hatching enzymes, which are proteolytic enzymes secreted from hatching gland cells of the embryo. The functional property and molecular structure of the hatching enzyme and its gene structure have been mainly elucidated in a freshwater teleost, medaka (Oryzias latipes) (Yasumasu et al. 1994). Recently, the developmental expression of hatching enzyme genes has been well studied in medaka and some other freshwater fishes, masu salmon (Oncorhynchus masou) and zebrafish (Danio rerio) (Inohaya et al. 1997). However, for marine teleosts such as the Japaneseeel, Anguilla japonica, which hatch in seawater, no information is available on hatching enzymes.


Masu Salmon Oncorhynchus Masou Carp Pituitary Extract Hatching Enzyme Masu Salmon Oncorhynchus Masou 
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Copyright information

© Springer-Verlag Tokyo 2003

Authors and Affiliations

  • Junya Hiroi
    • 1
    • 2
  • Shigeki Yasumasu
    • 3
  • Kouji Kawazu
    • 4
  • Toyoji Kaneko
    • 1
  1. 1.Ocean Research InstituteThe University of TokyoNakano-ku, TokyoJapan
  2. 2.St. Marianna University School of MedicineKawasaki, KanagawaJapan
  3. 3.Life Science InstituteSophia UniversityChiyoda-ku, TokyoJapan
  4. 4.Chiba Prefectural Freshwater Fisheries Research CenterSakura, ChibaJapan

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