View More View Less
  • 1 I: Georgikon Faculty of Agriculture, University of Veszprém; II: Faculty of Animal Science, University of Kaposvár I: Deák F. u. 16, H-8360 Keszthely; II: Guba S. u. 40. H-7400 Kaposvár, Hungary
  • 2 Faculty of Veterinary Science, Szent István University István u. 2, H-1400 Budapest, Hungary
  • 3 Faculty of Veterinary Science, Szent István University István u. 2, H-1400 Budapest, Hungary
  • 4 Faculty of Animal Science, University of Kaposvár Guba S. u. 40. H-7400 Kaposvár, Hungary
  • 5 Georgikon Faculty of Agriculture, University of Veszprém Deák F. u. 16, H-8360 Keszthely, Hungary
  • 6 Georgikon Faculty of Agriculture, University of Veszprém Deák F. u. 16, H-8360 Keszthely, Hungary
Restricted access

The artificial induction of sexual maturation of European eel males was carried out by using weekly hCG administrations. Histological pictures showed that the testis tissues developed and regressed naturally and no pathological changes took place under the conditions of artificial rearing in freshwater. According to light and electron microscopic investigations the morphology and motility of the spermatozoa of males kept in freshwater proved to be similar to those in seawater. The authors suppose that freshwater rearing of males is not a barrier factor in the artificial propagation of European eels.

  • Colombo, G., Grandi, G., Romeo, A., Giovanni, G., Pelizzola, D., Catozzi, L., Piffanelli, A. (1987) Testis cytological structure, plasma sex steroids, and gonad cytosol free steroid receptors of heterologous gonadotropin (hCG)-stimulated silver eel, Anguilla anguilla L. Gen. Comp. Endocrin. 65, 167-178.

    'Testis cytological structure, plasma sex steroids, and gonad cytosol free steroid receptors of heterologous gonadotropin (hCG)-stimulated silver eel, Anguilla anguilla L ' () 65 Gen. Comp. Endocrin : 167 -178.

    • Search Google Scholar
  • Dollerup, J., Graver, C. M. (1985) Repeated induction of testicular maturation and spermiation, alternating with periods of feeding and growth in silver eels, Anguilla anguilla (L.). Dana 4, 19-39.

    'Repeated induction of testicular maturation and spermiation, alternating with periods of feeding and growth in silver eels, Anguilla anguilla (L.) ' () 4 Dana : 19 -39.

    • Search Google Scholar
  • Gibbons, B. H., Gibbons, I. R., Bacceti, B. (1983) Structure and motility of the 9 + 0 flagellum of eel spermatozoa. J. Submicr. Cytol. 15, 15-20.

    'Structure and motility of the 9 + 0 flagellum of eel spermatozoa ' () 15 J. Submicr. Cytol : 15 -20.

    • Search Google Scholar
  • Hibiya, T. (1982) An Atlas of Fish Histology. Kodansha, Tokyo, Gustav-Fischer-Verlag, New York, Stuttgart.

  • Okamura, A., Zhang, H., Yamada, Y., Tanaka, S., Horie, N., Mikawa, N., Utoh, T., Oka, H. P. (2000) Re-examination of the spermatozoal ultrastructure of eels: observations of the external morphology of spermatozoa in three species. J. Fish Biol. 57, 161-169.

    'Re-examination of the spermatozoal ultrastructure of eels: observations of the external morphology of spermatozoa in three species ' () 57 J. Fish Biol : 161 -169.

    • Search Google Scholar
  • Boëtius, I., Boëtius, J. (1967) Studies in the European Eel, Anguilla anguilla (L.). Experimental induction of the male sexual cycle, its relation to temperature and other factors. Medd. Dan. Fisk. Havunders. 4, 339-405.

    'Studies in the European Eel, Anguilla anguilla (L.). Experimental induction of the male sexual cycle, its relation to temperature and other factors ' () 4 Medd. Dan. Fisk. Havunders : 339 -405.

    • Search Google Scholar