Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France)
National audience The aim of the current study was to describe the morphological and physiological changes, which occur during the transition from yellow to silver eel (Anguilla anguilla). We investigated the different stages present in an eel population prior to the downstream migration. We were th...
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ftunivnantes:oai:HAL:hal-02579605v1 2023-05-15T13:26:52+02:00 Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France) Analyse des paramètres morphologiques et physiologiques lors de la préparation à la migration de dévalaison chez l'anguille européenne (Anguilla anguilla) du lac de Grand-Lieu (Loire-Atlantique) Durif, Caroline Elie, Pierre Dufour, S. Marchelidon, J. Vidal, B. Ressources aquatiques continentales (UR RABX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Muséum national d'Histoire naturelle (MNHN) 2000 https://hal.inrae.fr/hal-02579605 fr fre HAL CCSD Paris : Muséum national d'histoire naturelle hal-02579605 https://hal.inrae.fr/hal-02579605 IRSTEA: PUB00008960 ISSN: 0399-0974 EISSN: 2101-0315 Cybium : Revue Internationale d’Ichtyologie https://hal.inrae.fr/hal-02579605 Cybium : Revue Internationale d’Ichtyologie, Paris : Muséum national d'histoire naturelle, 2000, 24 (3), pp.63-74 FRANCE LOIRE ATLANTIQUE GRAND LIEU LAC [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2000 ftunivnantes 2022-07-13T00:00:03Z National audience The aim of the current study was to describe the morphological and physiological changes, which occur during the transition from yellow to silver eel (Anguilla anguilla). We investigated the different stages present in an eel population prior to the downstream migration. We were thus able to observe the sequence of changes during the metamorphosis. Measurements were taken on 205 eels captured in the lake of Grand-Lieu (france). To evaluate the degree of metamorphosis, gonads, digestive tract, and liver were weighed and the level of gonadotropic hormone was measured. Principal component analysis was carried out on a subsample of eels for which we had all four physiological parameters in order to determine homogeneous groups according to their sex and degree of maturation. Thus, three groups were identified : the first one corresponding to male silver and intermediate eels, the second one, silver and intermediate females, and the third group yellow eels. Discriminant functions based on morphological variables were then calculated and used to reclassify individuals in their initial category. Eels were correctly reclassified at 94 %. These functions were then applied on the whole sample. Results of the classification were compared to initial data, allowing the identification of four different stages as well as the sequence of events during the beginning of the metamorphosis. L'objectif de cette étude a été de décrire de façon précise les différents stades d'anguilles (Anguilla anguilla) avant leur migration d'avalaison de manière à visualiser la succession des changements au cours de la transition anguille jaune - anguille argentée. Des mesures ont été effectuées sur 305 anguilles provenant du lac de Grand-Lieu (Loire-Atlantique). Afin d'évaluer le degré de métamorphose des anguilles, nous avons mesuré les poids des gonades, de l'intestion et du foie ainsi que la teneur en GtH. Une analyse en composantes principales a été effectuée sur les anguilles pour lesquelles nous disposions des quatre ... Article in Journal/Newspaper Anguilla anguilla Université de Nantes: HAL-UNIV-NANTES |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
French |
topic |
FRANCE LOIRE ATLANTIQUE GRAND LIEU LAC [SDE]Environmental Sciences |
spellingShingle |
FRANCE LOIRE ATLANTIQUE GRAND LIEU LAC [SDE]Environmental Sciences Durif, Caroline Elie, Pierre Dufour, S. Marchelidon, J. Vidal, B. Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France) |
topic_facet |
FRANCE LOIRE ATLANTIQUE GRAND LIEU LAC [SDE]Environmental Sciences |
description |
National audience The aim of the current study was to describe the morphological and physiological changes, which occur during the transition from yellow to silver eel (Anguilla anguilla). We investigated the different stages present in an eel population prior to the downstream migration. We were thus able to observe the sequence of changes during the metamorphosis. Measurements were taken on 205 eels captured in the lake of Grand-Lieu (france). To evaluate the degree of metamorphosis, gonads, digestive tract, and liver were weighed and the level of gonadotropic hormone was measured. Principal component analysis was carried out on a subsample of eels for which we had all four physiological parameters in order to determine homogeneous groups according to their sex and degree of maturation. Thus, three groups were identified : the first one corresponding to male silver and intermediate eels, the second one, silver and intermediate females, and the third group yellow eels. Discriminant functions based on morphological variables were then calculated and used to reclassify individuals in their initial category. Eels were correctly reclassified at 94 %. These functions were then applied on the whole sample. Results of the classification were compared to initial data, allowing the identification of four different stages as well as the sequence of events during the beginning of the metamorphosis. L'objectif de cette étude a été de décrire de façon précise les différents stades d'anguilles (Anguilla anguilla) avant leur migration d'avalaison de manière à visualiser la succession des changements au cours de la transition anguille jaune - anguille argentée. Des mesures ont été effectuées sur 305 anguilles provenant du lac de Grand-Lieu (Loire-Atlantique). Afin d'évaluer le degré de métamorphose des anguilles, nous avons mesuré les poids des gonades, de l'intestion et du foie ainsi que la teneur en GtH. Une analyse en composantes principales a été effectuée sur les anguilles pour lesquelles nous disposions des quatre ... |
author2 |
Ressources aquatiques continentales (UR RABX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Muséum national d'Histoire naturelle (MNHN) |
format |
Article in Journal/Newspaper |
author |
Durif, Caroline Elie, Pierre Dufour, S. Marchelidon, J. Vidal, B. |
author_facet |
Durif, Caroline Elie, Pierre Dufour, S. Marchelidon, J. Vidal, B. |
author_sort |
Durif, Caroline |
title |
Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France) |
title_short |
Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France) |
title_full |
Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France) |
title_fullStr |
Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France) |
title_full_unstemmed |
Analysis of morphological and physiological parameters during the silvering process of the European eel (Anguilla anguilla) in the lake of Grand-Lieu (France) |
title_sort |
analysis of morphological and physiological parameters during the silvering process of the european eel (anguilla anguilla) in the lake of grand-lieu (france) |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.inrae.fr/hal-02579605 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
ISSN: 0399-0974 EISSN: 2101-0315 Cybium : Revue Internationale d’Ichtyologie https://hal.inrae.fr/hal-02579605 Cybium : Revue Internationale d’Ichtyologie, Paris : Muséum national d'histoire naturelle, 2000, 24 (3), pp.63-74 |
op_relation |
hal-02579605 https://hal.inrae.fr/hal-02579605 IRSTEA: PUB00008960 |
_version_ |
1766394998894362624 |