View More View Less
  • 1 Georgikon Faculty of Agriculture, University of Veszprém H-8360 Keszthely, Deák F. u. 16, Hungary
  • 2 University of Veszprém, Georgikon Faculty of Agriculture Deák F. u. 16, H-8360 Keszthely, Hungary
  • 3 Faculty of Animal Science, Kaposvár University H-7400 Kaposvár, Guba S. u. 40, Hungary
  • 4 Georgikon Faculty of Agriculture, University of Veszprém H-8360 Keszthely, Deák F. u. 16, Hungary
Restricted access

Previously described and alternative methods of the induction of sexual maturation in the European eel were investigated. Weekly administrations of a gonadoliberin agonist (GnRH-A=D-Phe6-GnRH-Ea) did not induce statistically significant effect on the gonads of treated eels in none of the dosages used (0.1 mg and 10 mg/fish). Carp pituitary extract and carp pituitary extract together with a dopamine antagonist caused considerable external changes (increase in eye size) and significant gonadal development in two treatment groups: wild and cultivated stocks. The induction of the ovulation by double amount of CP and gonadoliberin agonist with dopamine antagonist mixture was not successful in a wild stock. Fertilisation of stripped eggs of farm eel was attempted unsuccessfully in, due to low egg quality. An advanced phase of the sexual maturation process could be induced in specimen infected by Anguillicola crassus indicating, that nematode infection is not a limiting factor in the artificial propagation of the European eel.

  • Pankhurst, N. W. (1982) Relation of visual changes to the onset of sexual maturation in the European eel, Anguilla anguilla (L.). J. Fish. Biol. 21, 127-140.

    'Relation of visual changes to the onset of sexual maturation in the European eel, Anguilla anguilla (L.) ' () 21 J. Fish. Biol. : 31 -140.

    • Search Google Scholar
  • Pedersen, B. H., Ueberschar, B., Kurokawa, T. (2003) Digestive response and rates of growth in preleptocephalus larvae of the Japanese eel Anguilla japonica reared on artificial diets. Aquaculture 215, 321-338

    'Digestive response and rates of growth in preleptocephalus larvae of the Japanese eel Anguilla japonica reared on artificial diets ' () 215 Aquaculture : 31 -338.

    • Search Google Scholar
  • Prokhorchik, G. A., (1986) Postembryonic development of European eel, Anguilla anguilla, under experimental conditions. Vopr. Ikhtiol. 26, 802-807. (In Russian)

    'Postembryonic development of European eel, Anguilla anguilla, under experimental conditions ' () 26 Vopr. Ikhtiol. : 31 -807.

    • Search Google Scholar
  • Okamura, A., Oka, H. P., Yamada, Y., Utoh, T., Mikawa, N., Horie, N., Tanaka, S. (2002) Development of lateral line organs in Leptocephali of the freshwater eel Anguilla japonica (Teleostei, Anguilliformaes). J. Morphol. 254, 81-91.

    'Development of lateral line organs in Leptocephali of the freshwater eel Anguilla japonica (Teleostei, Anguilliformaes) ' () 254 J. Morphol. : 31 -91.

    • Search Google Scholar
  • Prokhorchik, G. A., Petukhov, V. B., Petrikov, A. M. (1987) Embryonic development of European eel, Anguilla anguilla, under experimental conditions. Vopr Ikhtiol. 27, 124-131. (In Russian.)

    'Embryonic development of European eel, Anguilla anguilla, under experimental conditions ' () 27 Vopr Ikhtiol. : 31 -131.

    • Search Google Scholar
  • Sato, N., Kawazoe, I., Suzuki, Y., Aida, K. (1997) Development of an emulsion prepared with lipophilized gelatin and its application for hormone administration in the Japanese eel Anguilla japonica. Fish. Physiol. Biochem. 17, 171-178.

    'Development of an emulsion prepared with lipophilized gelatin and its application for hormone administration in the Japanese eel Anguilla japonica ' () 17 Fish. Physiol. Biochem. : 31 -178.

    • Search Google Scholar
  • Sato, N., Kawazoe, I., Suzuki, Y., Aida, K. (2000) Adequate interval of sGTH administration to induce vitellogenesis, and induction of ovulation by simultaneous administration of sGTH and 17α-hydroxyprogesterone in the Japanese eel. Fisheries Sci. 66, 644-654.

    'Adequate interval of sGTH administration to induce vitellogenesis, and induction of ovulation by simultaneous administration of sGTH and 17α-hydroxyprogesterone in the Japanese eel ' () 66 Fisheries Sci. : 31 -654.

    • Search Google Scholar
  • Satoh, H., Yamamori, K., Hibiya, T. (1992). Induced spawning of the Japanese eel. Nippon Suisan Gakk. 58, 825-832.

    '. Induced spawning of the Japanese eel ' () 58 Nippon Suisan Gakk. : 31 -832.

  • Sorensen, P. W., Winn, H. E. (1984) The induction of maturation and ovulation in American eels, Anguilla rostrata (LeSueur), and the relevance of chemical and visual cues to male spawning behaviour. J. Fish. Biol. 25, 261-268.

    'The induction of maturation and ovulation in American eels, Anguilla rostrata (LeSueur), and the relevance of chemical and visual cues to male spawning behaviour ' () 25 J. Fish. Biol. : 31 -268.

    • Search Google Scholar
  • Dufour, S., Lopez, E., Le Menn, F., Le Belle, N., Baloche, S., Fontaine, Y.-A. (1988) Stimulation of gonadotropin release and of ovarian development, by the administration of a gonadoliberelin agonist and of dopamine antagonists, in female silver eel pretreated with estradiol. Gen. Comp. Endocrinol. 70, 20-30.

    'Stimulation of gonadotropin release and of ovarian development, by the administration of a gonadoliberelin agonist and of dopamine antagonists, in female silver eel pretreated with estradiol ' () 70 Gen. Comp. Endocrinol. : 31 -30.

    • Search Google Scholar
  • Fontaine, M., Bertrand, E., Lopez, E., Callamand, O. (1964) Sur la maturation des organes génitaux de l'anguille femelle (Anguilla anguilla L.) et l'emission spontanée des oeufs en aquarium. C. R. Acad. Sc. Paris 259, 2907-2910.

    'Sur la maturation des organes génitaux de l'anguille femelle (Anguilla anguilla L.) et l'emission spontanée des oeufs en aquarium ' () 259 C. R. Acad. Sc. Paris : 31 -2910.

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

    An Atlas of Fish Histology , ().

  • Dufour, S., Bassompierre, M., Montero, M., Belle, N. D.-L., Baloche, S., Fontaine, Y.-A. (1991) Stimulation of pituitary gonadotropic function in female silver eel treated by a gonadoliberin agonist and dopamine antagonists. In: Scott, A. P., Sumpter, J. P., Kime, D. E., Rolfe, M. F. (eds) Reproductive Physiology of Fish Fishsymp. 91, Sheffield, 54-60.

    Reproductive Physiology of Fish Fishsymp , () 31 -60.

  • Sprengel, G., Lüchtenberg, H. (1991) Infection by endoparasites reduces maximum swimming speed of European smelt Osmerus eperlanus and European eel, Anguilla anguilla. Dis. Aquat. Org. 11, 31-35.

    'Infection by endoparasites reduces maximum swimming speed of European smelt Osmerus eperlanus and European eel ' () 11 Anguilla anguilla. Dis. Aquat. Org. : 31 -35.

    • Search Google Scholar
  • Székely, Cs., Molnár, K. (1987) Mebendazole is an efficacious drug against pseudodactylogirosis in the European eel (Anguilla anguilla). Sonderdruck aus Journal of Applied Ichthyology. 3, 183-186.

    'Mebendazole is an efficacious drug against pseudodactylogirosis in the European eel (Anguilla anguilla). Sonderdruck aus ' () 3 Journal of Applied Ichthyology. : 31 -186.

    • Search Google Scholar
  • Tanaka, H., Kagawa, H., Ohta, H., Okuzawa, K., Hirose, K. (1995) The first report of eel larvae ingesting rotifers. Fisheries Sci. 61, 171-172.

    'The first report of eel larvae ingesting rotifers ' () 61 Fisheries Sci. : 31 -172.

  • Ijiri, S., Kazeto, Y., Takeda, N., Chiba, H., Adachi, S., Yamauchi, K. (1995) Changes in serum steroid hormones and steroidogenic ability of ovarian follicles during artificial maturation of cultivated Japanese eel Anguilla japonica. Aquaculture 135, 3-16.

    'Changes in serum steroid hormones and steroidogenic ability of ovarian follicles during artificial maturation of cultivated Japanese eel Anguilla japonica ' () 135 Aquaculture : 31 -16.

    • Search Google Scholar
  • Ijiri, S., Kayaba, T., Takeda, N., Tachiki, H., Adachi, S., Yamauchi, K. (1998) Pretreatment reproductive stage and oocyte development induced by salmon pituarity homogenate in the Japanese eel Anguilla japonica. Fisheries Sci. 64, 531-537.

    'Pretreatment reproductive stage and oocyte development induced by salmon pituarity homogenate in the Japanese eel Anguilla japonica ' () 64 Fisheries Sci. : 31 -537.

    • Search Google Scholar
  • Lokman, P. H., Young, G. (1988) An intersexual migratory (silver) longfinned New Zealand eel and its gonadal response to treatment with salmon pituitary homogenate. J. Fish Biol. 52, 547-555.

    'An intersexual migratory (silver) longfinned New Zealand eel and its gonadal response to treatment with salmon pituitary homogenate ' () 52 J. Fish Biol. : 31 -555.

    • Search Google Scholar
  • Lokman, P. H., Young, G. (2000) Induced spawning and early ontogeny of New Zealand freshwater eels (Anguilla dieffenbachi and A. australis). New Zeal. J. Mar. Fresh. 34, 135-145.

    'Induced spawning and early ontogeny of New Zealand freshwater eels (Anguilla dieffenbachi and A. australis) ' () 34 New Zeal. J. Mar. Fresh. : 31 -145.

    • Search Google Scholar
  • Molnér, K., Székely, Cs., Baska, F. (1991) Mass mortality of eel in Lake Balaton due to Anguillicola crassus infection. Bull. Eur. Ass. Fish Pathol. 11, 211.

    'Mass mortality of eel in Lake Balaton due to Anguillicola crassus infection ' () 11 Bull. Eur. Ass. Fish Pathol. : 211.

    • Search Google Scholar
  • Müller, T., Binder, T., Váradi, B., Bercsényi, M. (2001) Induced maturation and successful egg release in the European eel (Anguilla anguilla L.). Halázat 94, 115-119. (In Hungarian.)

    'Induced maturation and successful egg release in the European eel (Anguilla anguilla L.) ' () 94 Halázat : 31 -119.

    • Search Google Scholar
  • Nagahama, Y. (1983) The functional morphology of teleost gonads. In: Hoar, W. S., Randall, D. J., Donaldson, E. M. (eds) Fish Physiology, Vol. IXA. New York: Academic Press, 223-275.

    Fish Physiology , ().

  • Ohta, H., Kagawa, H., Tanaka, H., Okuzawa, K., Hirose, K. (1996) Changes in fertilization and hatching rates with time after ovulation induced by 17 alfa-20 beta-dihydroxy-4-pregnen-3-one in the Japanese eel (Anguilla japonica). Aquaculture 139, 291-301.

    'Changes in fertilization and hatching rates with time after ovulation induced by 17 alfa-20 beta-dihydroxy-4-pregnen-3-one in the Japanese eel ' () 139 (Anguilla japonica). Aquaculture : 31 -301.

    • Search Google Scholar
  • Ohta, H., Kagawa, H., Tanaka, H., Okuzawa, K., linuma, N., Hirose, K. (1997) Artificial induction of maturation and fertilization in the Japanese eel, Anguilla japonica. Fish. Physiol. Biochem. 17, 163-169.

    'Artificial induction of maturation and fertilization in the Japanese eel ' () 17 Anguilla japonica. Fish. Physiol. Biochem. : 31 -169.

    • Search Google Scholar
  • Tanaka, H., Kagawa, H., Ohta, H. (2001) Production of leptocephali of Japanese eel (Anguilla japonica) in captivity. Aquaculture 201, 51-60.

    'Production of leptocephali of Japanese eel (Anguilla japonica) in captivity ' () 201 Aquaculture : 31 -60.

    • Search Google Scholar
  • Yamamoto, K., Yamauchi, K. (1974) Sexual maturation of Japanese eel and production of eel larvae in the aquarium. Nature 251, 220-222.

    'Sexual maturation of Japanese eel and production of eel larvae in the aquarium ' () 251 Nature : 31 -222.

    • Search Google Scholar
  • Yamauchi, K., Nakamura, M., Takahashi, H., Takano, K. (1976) Cultivation of larvae of Japanese eel. Nature 263, 412.

    'Cultivation of larvae of Japanese eel ' () 263 Nature : 412.

  • Amin, E. M. (1997) Observations on reproduction techniques applicable to the European eel (Anguilla anguilla L.). In: Bartley, D., Basurco, B. (eds) Genetics and Breeding of Mediterranean Aquaculture Species, 34 CIHEAM-IAMZ, Zaragoza, 223-234.

    Genetics and Breeding of Mediterranean Aquaculture Species , () 31 -234.

  • Boëtius, I., Boëtius, J. (1980) Experimental maturation of female silver eels, Anguilla anguilla, Estimates of fecundity and energy reserves for migration and spawning. Dana 1, 1-28.

    'Experimental maturation of female silver eels, Anguilla anguilla, Estimates of fecundity and energy reserves for migration and spawning ' () 1 Dana : 31 -28.

    • Search Google Scholar
  • Kagawa, H., Tanaka, H., Ohta, H., Okuzawa, K., Hirose, K. (1995) in vitro effects of 17α-hydroxyprogesterone and 17α,20β-dihydroxy-4-pregnen-3-one on final maturation of oocytes at various developmental stages in artificially matured Japanese eel Anguilla Japonica. Fisheries Sci. 61, 1012-1015.

    'in vitro effects of 17α-hydroxyprogesterone and 17α,20β-dihydroxy-4-pregnen-3-one on final maturation of oocytes at various developmental stages in artificially matured Japanese eel Anguilla Japonica ' () 61 Fisheries Sci. : 31 -1015.

    • Search Google Scholar
  • Kagawa, H., linuma, M., Tanaka, H., Ohta, H., Okuzawa, K. (1998) Effects of rearing period in seawater or induced maturation in female Japanese eel Anguilla japonica. Fischeries Sci. 64, 77-82.

    'Effects of rearing period in seawater or induced maturation in female Japanese eel Anguilla japonica ' () 64 Fischeries Sci. : 31 -82.

    • Search Google Scholar