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Spontaneous and induced oogenesis-morphological differences between oocytes from New Zealand longfinned and Japanese eels
Lokman, P.M.; Watari, H.; Okumura, H.; Kazeto, Y.; Young, G.; Adachi, S.; Yamauchi, K. (2000). Spontaneous and induced oogenesis-morphological differences between oocytes from New Zealand longfinned and Japanese eels, in: Norberg, B. et al. (Ed.) Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. pp. 308
In: Norberg, B. et al. (Ed.) (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., more
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales, more

Available in  Authors 
    VLIZ: Proceedings [4265]

Keyword
    Marine

Authors  Top 
  • Lokman, P.M.
  • Watari, H.
  • Okumura, H.
  • Kazeto, Y.
  • Young, G.
  • Adachi, S.
  • Yamauchi, K.

Abstract
    We compared vitellogenin (VTG) levels and oocyte cytology of artificially maturing Japanese eels (JE) to those of naturally maturing New Zealand longfinned eels (LFE) to determine whether oogenesis during artificial maturation proceeds 'normally'. VTG levels were generally similar in immature and vitellogenic eels of both species. Histologically, oocytes of LFE contained more lipid and were less lipovitellin immunoreactive. Moreover, the zona radiata (ZR) appeared considerably thicker in JE oocytes, which was attributed to more advanced development of the inner ZR layer, as seen by electron microscopy. It is concluded that oocytes from artificially maturing JE enter vitellogenesis at an earlier stage or develop at a quicker pace than LFE oocytes when they reach 350-400 µm in diameter.

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