Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel
International audience The gonadosomatic indices (I-G) of female conger eel Conger conger, aged between 2 and 11 years postmetamorphosis, ranged between 0(.)04 and 4(.)78 and were correlated with both age and body length. Microscopical examination of the gonads showed immature ovaries at two main st...
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ftunivnantes:oai:HAL:hal-02580308v1 2023-05-15T13:27:48+02:00 Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel Sbaihi, M. Fouchereau Peron, M. Meunier, F. Elie, Pierre Mayer, I. Burzawa Gerard, E. Vidal, B. Dufour, S. Muséum national d'Histoire naturelle (MNHN) Ressources aquatiques continentales (UR RABX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) STOCKHOLM UNIVERSITY SWE Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) 2001 https://hal.inrae.fr/hal-02580308 en eng HAL CCSD Wiley hal-02580308 https://hal.inrae.fr/hal-02580308 IRSTEA: PUB00009993 ISSN: 0022-1112 EISSN: 1095-8649 Journal of Fish Biology https://hal.inrae.fr/hal-02580308 Journal of Fish Biology, Wiley, 2001, 49 (2), pp.302-318 FRANCE BRETAGNE [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2001 ftunivnantes 2022-07-13T00:00:03Z International audience The gonadosomatic indices (I-G) of female conger eel Conger conger, aged between 2 and 11 years postmetamorphosis, ranged between 0(.)04 and 4(.)78 and were correlated with both age and body length. Microscopical examination of the gonads showed immature ovaries at two main stages of oocyte development, pre-vitellogenic oocytes for I-G1. The immaturity of the conger eels sampled in Concarneau Bay indicates that this species probably spawns in deeper oceanic waters. Radioimmunoassays (RIA) of sex steroids gave low serum levels of oestradiol and of 11-ketotestosterone, but higher levels of testosterone correlated with increase in I-G. Immunoenzymatic assay (ELISA) indicated low serum levels of vitellogenin (VtG), which were significantly correlated with I-G. The pre-vitellogenic and early vitellogenic stages observed in the coastal C conger were similar to the oocyte stages found in the European eel Anguilla anguilla, at the yellow and silver phases of its life cycle respectively. However, other morpho-functional changes, associated with silvering in Anguilla species, such as the increase in ocular index, and regression of the digestive tract, did not occur at the early vitellogenic stage in conger eels. (C) 2001 The Fisheries Society of the British Isles Article in Journal/Newspaper Anguilla anguilla European eel Université de Nantes: HAL-UNIV-NANTES |
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Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
FRANCE BRETAGNE [SDE]Environmental Sciences |
spellingShingle |
FRANCE BRETAGNE [SDE]Environmental Sciences Sbaihi, M. Fouchereau Peron, M. Meunier, F. Elie, Pierre Mayer, I. Burzawa Gerard, E. Vidal, B. Dufour, S. Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel |
topic_facet |
FRANCE BRETAGNE [SDE]Environmental Sciences |
description |
International audience The gonadosomatic indices (I-G) of female conger eel Conger conger, aged between 2 and 11 years postmetamorphosis, ranged between 0(.)04 and 4(.)78 and were correlated with both age and body length. Microscopical examination of the gonads showed immature ovaries at two main stages of oocyte development, pre-vitellogenic oocytes for I-G1. The immaturity of the conger eels sampled in Concarneau Bay indicates that this species probably spawns in deeper oceanic waters. Radioimmunoassays (RIA) of sex steroids gave low serum levels of oestradiol and of 11-ketotestosterone, but higher levels of testosterone correlated with increase in I-G. Immunoenzymatic assay (ELISA) indicated low serum levels of vitellogenin (VtG), which were significantly correlated with I-G. The pre-vitellogenic and early vitellogenic stages observed in the coastal C conger were similar to the oocyte stages found in the European eel Anguilla anguilla, at the yellow and silver phases of its life cycle respectively. However, other morpho-functional changes, associated with silvering in Anguilla species, such as the increase in ocular index, and regression of the digestive tract, did not occur at the early vitellogenic stage in conger eels. (C) 2001 The Fisheries Society of the British Isles |
author2 |
Muséum national d'Histoire naturelle (MNHN) Ressources aquatiques continentales (UR RABX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) STOCKHOLM UNIVERSITY SWE Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) |
format |
Article in Journal/Newspaper |
author |
Sbaihi, M. Fouchereau Peron, M. Meunier, F. Elie, Pierre Mayer, I. Burzawa Gerard, E. Vidal, B. Dufour, S. |
author_facet |
Sbaihi, M. Fouchereau Peron, M. Meunier, F. Elie, Pierre Mayer, I. Burzawa Gerard, E. Vidal, B. Dufour, S. |
author_sort |
Sbaihi, M. |
title |
Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel |
title_short |
Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel |
title_full |
Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel |
title_fullStr |
Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel |
title_full_unstemmed |
Reproductive biology of the conger eel from the south coast of Brittany, France and comparison with the European eel |
title_sort |
reproductive biology of the conger eel from the south coast of brittany, france and comparison with the european eel |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.inrae.fr/hal-02580308 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
ISSN: 0022-1112 EISSN: 1095-8649 Journal of Fish Biology https://hal.inrae.fr/hal-02580308 Journal of Fish Biology, Wiley, 2001, 49 (2), pp.302-318 |
op_relation |
hal-02580308 https://hal.inrae.fr/hal-02580308 IRSTEA: PUB00009993 |
_version_ |
1766400420610048000 |