Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France
This paper assesses potential production of premigrant European eels Anguilla anguilla based on analysis of sedentary eel populations in two small river systems in western France that are in close proximity. Abundance and biological characteristics were evaluated from electrofishing surveys conducte...
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American Fisheries Society
2008
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:6224 2023-05-15T13:27:09+02:00 Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France Acou, Anthony Gabriel, Gaëlle Feunteun, Eric Laffaille, Pascal Centre National de la Recherche Scientifique - CNRS (FRANCE) Fish-Pass (FRANCE) Université de La Rochelle (FRANCE) Université de Rennes 1 (FRANCE) 2008 application/pdf http://oatao.univ-toulouse.fr/6224/ http://oatao.univ-toulouse.fr/6224/1/Lafaille_6224.pdf en eng American Fisheries Society http://oatao.univ-toulouse.fr/6224/1/Lafaille_6224.pdf Acou, Anthony and Gabriel, Gaëlle and Feunteun, Eric and Laffaille, Pascal. Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France. (2008) In: Eels at the edge : science, status, and conservation concerns, 11-13 Août 2003, Québec, Canada . info:eu-repo/semantics/openAccess Biologie animale Ecologie Environnement Silver eel Biomass Small river Conference or Workshop Item PeerReviewed info:eu-repo/semantics/conferenceObject 2008 ftunivtoulouseoa 2019-08-29T11:17:44Z This paper assesses potential production of premigrant European eels Anguilla anguilla based on analysis of sedentary eel populations in two small river systems in western France that are in close proximity. Abundance and biological characteristics were evaluated from electrofishing surveys conducted in three years in September and October, before the catadromous migration of silver eels. Mean density and biomass density of the eel population differed greatly between the systems (39 ± 6 ind.100 m ± 2 and 1352 ± 171 g.100 m ± 2 in the Frémur River and 3 ± 0.32 ind.100 m ± 2 and 385 ± 42 g.100 m ± 2 in the Oir River). Premigrants were dominated by males in the Frémur (85.8%) and by females in the Oir (79.0%). Estimated premigrant biomass density was 4.5-fold higher in the Frémur (254.5 g.100 m ± 2.year ± 1) than in the Oir (56.0 g.100 m ± 2.year ± 1). Mean Fulton’s K condition factor was significantly higher for both sexes in the Oir (0.20 ± 0.004 and 0.20 ± 0.003 for males and females, respectively) than in the Frémur (0.17 ± 0.002 and 0.17 ± 0.004, respectively). The large differences in densities and biological characteristics of eels from neighboring catchments suggest that huge variability of both quantity and quality of silver eel production can be expected at the scale of the European stock. Conference Object Anguilla anguilla OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Biologie animale Ecologie Environnement Silver eel Biomass Small river |
spellingShingle |
Biologie animale Ecologie Environnement Silver eel Biomass Small river Acou, Anthony Gabriel, Gaëlle Feunteun, Eric Laffaille, Pascal Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France |
topic_facet |
Biologie animale Ecologie Environnement Silver eel Biomass Small river |
description |
This paper assesses potential production of premigrant European eels Anguilla anguilla based on analysis of sedentary eel populations in two small river systems in western France that are in close proximity. Abundance and biological characteristics were evaluated from electrofishing surveys conducted in three years in September and October, before the catadromous migration of silver eels. Mean density and biomass density of the eel population differed greatly between the systems (39 ± 6 ind.100 m ± 2 and 1352 ± 171 g.100 m ± 2 in the Frémur River and 3 ± 0.32 ind.100 m ± 2 and 385 ± 42 g.100 m ± 2 in the Oir River). Premigrants were dominated by males in the Frémur (85.8%) and by females in the Oir (79.0%). Estimated premigrant biomass density was 4.5-fold higher in the Frémur (254.5 g.100 m ± 2.year ± 1) than in the Oir (56.0 g.100 m ± 2.year ± 1). Mean Fulton’s K condition factor was significantly higher for both sexes in the Oir (0.20 ± 0.004 and 0.20 ± 0.003 for males and females, respectively) than in the Frémur (0.17 ± 0.002 and 0.17 ± 0.004, respectively). The large differences in densities and biological characteristics of eels from neighboring catchments suggest that huge variability of both quantity and quality of silver eel production can be expected at the scale of the European stock. |
author2 |
Centre National de la Recherche Scientifique - CNRS (FRANCE) Fish-Pass (FRANCE) Université de La Rochelle (FRANCE) Université de Rennes 1 (FRANCE) |
format |
Conference Object |
author |
Acou, Anthony Gabriel, Gaëlle Feunteun, Eric Laffaille, Pascal |
author_facet |
Acou, Anthony Gabriel, Gaëlle Feunteun, Eric Laffaille, Pascal |
author_sort |
Acou, Anthony |
title |
Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France |
title_short |
Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France |
title_full |
Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France |
title_fullStr |
Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France |
title_full_unstemmed |
Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France |
title_sort |
differentiable production and condition indices of premigrant eels (anguilla anguilla) in two atlantic coastal catchments of france |
publisher |
American Fisheries Society |
publishDate |
2008 |
url |
http://oatao.univ-toulouse.fr/6224/ http://oatao.univ-toulouse.fr/6224/1/Lafaille_6224.pdf |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_relation |
http://oatao.univ-toulouse.fr/6224/1/Lafaille_6224.pdf Acou, Anthony and Gabriel, Gaëlle and Feunteun, Eric and Laffaille, Pascal. Differentiable production and condition indices of premigrant eels (Anguilla anguilla) in two Atlantic coastal catchments of France. (2008) In: Eels at the edge : science, status, and conservation concerns, 11-13 Août 2003, Québec, Canada . |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766396772378214400 |