Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river
This study reports on the first stage of a project for radio-tracking of Atlantic salmon (Salmo salar L.) as they migrated back up the Aulne river. The objective was to make a survey of anadromous migration on the water course of which 70 kilometres downstream are channelled. The behaviour of 40 sal...
Main Authors: | , , |
---|---|
Other Authors: | , , , , , , |
Format: | Report |
Language: | French |
Published: |
HAL CCSD
2000
|
Subjects: | |
Online Access: | https://hal.inrae.fr/hal-02579525 |
id |
ftccsdartic:oai:HAL:hal-02579525v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-02579525v1 2023-05-15T15:32:11+02:00 Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river Suivi par radiopistage de la migration anadrome du saumon atlantique sur l'Aulne : campagne 1999 Croze, O. Senecal, A. Woillez, Mathieu Groupe d'hydraulique appliquée aux aménagements piscicoles et à la protection de l'environnement (UR GHAAPPE) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Ressources aquatiques continentales (UR RABX) FEDERATION DE PECHE DU FINISTERE 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) irstea 2000 https://hal.inrae.fr/hal-02579525 fr fre HAL CCSD hal-02579525 https://hal.inrae.fr/hal-02579525 IRSTEA: PUB00008852 https://hal.inrae.fr/hal-02579525 irstea. 2000, pp.68 FRANCE AULNE COURS D'EAU [SDE]Environmental Sciences info:eu-repo/semantics/report Reports 2000 ftccsdartic 2021-11-21T00:51:39Z This study reports on the first stage of a project for radio-tracking of Atlantic salmon (Salmo salar L.) as they migrated back up the Aulne river. The objective was to make a survey of anadromous migration on the water course of which 70 kilometres downstream are channelled. The behaviour of 40 salmon was thus studied at 26 obstacles from the beginning of July to the middle of December 1999. The mean percentage of fish passing observed at the obstacles fitted with old fish-pass facilities proved to be less than that obtained for more recent fish-passes installed since 1994 (63% as against 94%). The study of the cumulative effect of the obstacles indicates that only 2% of the population are likely to get through the channelled part and reach areas which are suitable for reproduction. The most evident blocking was recorded on those obstacles which are the furthest downstream on the migration itinerary. The environmental conditions, such as sluggish flows and deteriorated water quality might make it difficult for salmon entering the river to progress. Moreover the salmon appear to behave in a particular way in this strongly anthropic environment. They withdraw into faster flowing areas during the summer and migrate massively downstream just before the reproduction period. 35% of the radio-tagged salmon leave the Aulne before the spawning period, enter the Brest harbour and go up other neighbouring water courses. La présente étude constitue le premier volet d'un suivi par radiopistage de saumons atlantiques (Salmo salar L.) au cours de leur remontée sur l'Aulne. L'objectif est de réaliser un état des lieux de la migration anadrome sur ce cours d'eau dont les 70 km aval sont canalisés. Le comportement de 40 saumons a ainsi été étudié de début juillet à mi décembre 1999, au niveau de 26 obstacles. Le pourcentage moyen de franchissement observé au niveau des seuils équipés d'anciens dispositifs de franchissement s'avère inférieur à celui obtenu au niveau des passes à poissons récentes installées depuis 1994 (63 % ... Report Atlantic salmon Salmo salar Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
FRANCE AULNE COURS D'EAU [SDE]Environmental Sciences |
spellingShingle |
FRANCE AULNE COURS D'EAU [SDE]Environmental Sciences Croze, O. Senecal, A. Woillez, Mathieu Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river |
topic_facet |
FRANCE AULNE COURS D'EAU [SDE]Environmental Sciences |
description |
This study reports on the first stage of a project for radio-tracking of Atlantic salmon (Salmo salar L.) as they migrated back up the Aulne river. The objective was to make a survey of anadromous migration on the water course of which 70 kilometres downstream are channelled. The behaviour of 40 salmon was thus studied at 26 obstacles from the beginning of July to the middle of December 1999. The mean percentage of fish passing observed at the obstacles fitted with old fish-pass facilities proved to be less than that obtained for more recent fish-passes installed since 1994 (63% as against 94%). The study of the cumulative effect of the obstacles indicates that only 2% of the population are likely to get through the channelled part and reach areas which are suitable for reproduction. The most evident blocking was recorded on those obstacles which are the furthest downstream on the migration itinerary. The environmental conditions, such as sluggish flows and deteriorated water quality might make it difficult for salmon entering the river to progress. Moreover the salmon appear to behave in a particular way in this strongly anthropic environment. They withdraw into faster flowing areas during the summer and migrate massively downstream just before the reproduction period. 35% of the radio-tagged salmon leave the Aulne before the spawning period, enter the Brest harbour and go up other neighbouring water courses. La présente étude constitue le premier volet d'un suivi par radiopistage de saumons atlantiques (Salmo salar L.) au cours de leur remontée sur l'Aulne. L'objectif est de réaliser un état des lieux de la migration anadrome sur ce cours d'eau dont les 70 km aval sont canalisés. Le comportement de 40 saumons a ainsi été étudié de début juillet à mi décembre 1999, au niveau de 26 obstacles. Le pourcentage moyen de franchissement observé au niveau des seuils équipés d'anciens dispositifs de franchissement s'avère inférieur à celui obtenu au niveau des passes à poissons récentes installées depuis 1994 (63 % ... |
author2 |
Groupe d'hydraulique appliquée aux aménagements piscicoles et à la protection de l'environnement (UR GHAAPPE) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Ressources aquatiques continentales (UR RABX) FEDERATION DE PECHE DU FINISTERE 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) irstea |
format |
Report |
author |
Croze, O. Senecal, A. Woillez, Mathieu |
author_facet |
Croze, O. Senecal, A. Woillez, Mathieu |
author_sort |
Croze, O. |
title |
Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river |
title_short |
Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river |
title_full |
Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river |
title_fullStr |
Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river |
title_full_unstemmed |
Radio-tracking of the anadromous migration of atlantic salmon on the Aulne river |
title_sort |
radio-tracking of the anadromous migration of atlantic salmon on the aulne river |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.inrae.fr/hal-02579525 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
https://hal.inrae.fr/hal-02579525 irstea. 2000, pp.68 |
op_relation |
hal-02579525 https://hal.inrae.fr/hal-02579525 IRSTEA: PUB00008852 |
_version_ |
1766362697620783104 |