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Acta Biologica Hungarica

, Volume 54, Issue 3–4, pp 313–322 | Cite as

Effects of Various Hormones on the Sexual Maturity of European Eel (Anguilla Anguilla L.) Females from Farm and Lakes

  • T. MüllerEmail author
  • B. Váradi
  • P. Horn
  • M. Bercsényi
Article

Abstract

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 μg and 10 μg/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.

Keywords

Eel artificial maturation Anguillicola crassus hormonal treatment 

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Notes

Acknowledgements

We would like to thank to Mr. Ferenc Németh, Mr. István Szabó, Mr. István Báthory for catching trial eels from Lake Balaton, Mr. Ákos Lukács Köröm eel farm and Mr. Lazaros Natzis DELI, Greece for providing the experimental fish. We are very grateful to the Pathology Department of the Keszthely Hospital for the histological slices. We also thank to Dr. Ferenc Müller (Institute of Toxicology and Genetics, Karlsruhe), who reviewed and corrected the manuscript. This work was supported by the Ministry of Education (BIO-169/2001 and OM-00440/2001).

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© Akadémiai Kiadó, Budapest 2003

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • T. Müller
    • 1
    • 2
    Email author
  • B. Váradi
    • 2
  • P. Horn
    • 1
  • M. Bercsényi
    • 2
  1. 1.University of Kaposvar, Faculty of Animal ScienceKaposvárHungary
  2. 2.University of Veszprém, Georgikon Faculty of AgricultureKeszthelyHungary

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