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Variabilité morphologique et physiologique des civelles d'anguilles dans l'estuaire de la Gironde

Abstract : The aim of this study is to complete the morphological description of Gironde glass eels according to a first physiological parameter, the growth hormone. The incoming flux had been observed during the migration season 1997-1998. 343 glass eels were caught and individually analysed. The length and the weight of the glass eels decreased in February, the condition factor only in March. The growth hormone rate increased from an average of 9 ng/ pituitary in December to an average of 18 ng / pituitary in February and March and up to an average of 22 ng / pituitary in April. The most credible hypothesis is that the first incoming glass eels show a smaller distress level than the last ones. It is not possible to justify the protection of the glass-eel either from the beginning of the season or from the end of the season because the glass eels from the beginning of the season, in better physological conditions, encounter more drastic environmental conditions. These results don't lead us to state about the existence of migration waves. This work concludes to the feasibility of a more important study (other hormones, several sampling points).
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Submitted on : Thursday, May 14, 2020 - 9:02:37 PM
Last modification on : Tuesday, September 14, 2021 - 9:54:01 AM


  • HAL Id : hal-02581286, version 1
  • IRSTEA : PUB00011388



Patrick Lambert, S. Dufour, Eric Rochard, M. Sbaihi, Pierre Elie, et al.. Variabilité morphologique et physiologique des civelles d'anguilles dans l'estuaire de la Gironde. irstea. 1999, pp.22. ⟨hal-02581286⟩



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