Atlantic salmons study Areas (Ponctual Abundance Sampling PAS) by session - Sélune Observatory

The opening of the dams should impact the functioning of Atlantic salmon populations migrating up the Sélune and its tributaries. Restoring the river's ecological continuity will alter population flows by allowing Atlantic salmon to migrate further upstream and downstream of the dams. The Atlantic salmon population is monitored at a network of stations covering the entire Sélune basin using an abundance index, which was carried out every two years before 2021 and annually since then.

Field campaigns comply with the fishing protocol developed by INRAE and OFB. The aim of this method is to estimate the abundance of juvenile Atlantic salmon (Salmo salar) at a station (or sector). This protocol targets juveniles of the year (aged 0+) whose abundance reflects the renewal of generations within the population (or recruitment) and survival after the embryonic development phases under gravel and the first months of life in the open environment. Field campaigns are carried out by INRAE and the Manche d'Ille-et-Vilaine Federation for Fishing and the Protection of the Aquatic Environment (FDAPPMA50 and FDAPPMA35).

This dataset provides the locations of these study sectors for IAS fishing sessions in the Sélune watershed by fishing session.

Date (Publication): 2025-09-29T00:00:00

Edition: Mise à jour 2024

Edition date: 2025-09-29

Identifier: fr-18007003900276-umrsas-selune-sctr_IAS_selune

Purpose: The purpose of this data is to locate where atlantic salmons catches were made as part of the salmaon PAS (Ponctual Abundance Sampling) protocol dans the Sélune observatory.

Status: Completed

Point of contact

UMR DECOD « Dynamique et durabilité des écosystèmes : de la source à l’océan » - Jean-Marc Roussel ( )

65 rue de Saint-Brieuc - CS 84215 , Rennes , 35042 , France

https://programme-selune.com/fr/

Point of contact

U3E Unité Expérimentale Ecologie Ecotoxicologie aquatique - Frédéric Marchand ( )

65 rue de Saint-Brieuc - CS 84215 , Rennes , 35042 , France

Point of contact

U3E Unité Expérimentale Ecologie Ecotoxicologie aquatique - Clarisse Boulenger ( )

65 rue de Saint-Brieuc - CS 84215 , Rennes , 35042 , France

Originator

Agence l'Eau Seine Normandie AESN -

Maintenance and update frequency: As needed

Place

Open data
atlantic salmon
Dam removal
fishing area

Keywords

Selune river
France
Normandy

Thésaurus INRAE

salmon
dam
abundance index
poisson migrateur amphihalin

Use limitation: Unrestricted use subject to the following compulsory wording on all distribution documents: "Source: INRAE - DECOD - U3E".

Use limitation: Open licence : https://www.etalab.gouv.fr/licence-ouverte-open-licence

Access constraints: Other restrictions

Use constraints: License

Other constraints: No public access restriction

Spatial representation type: Vector

Denominator: 25000

Metadata language: fre

Topic category

Environment

Begin date: 2012-09-02

End date: 2027-12-31

Reference system identifier: RGF93 / Lambert-93 (EPSG:2154)

Geometric object type: Point

Distributor

Distributor

UMR 1069 SAS INRA - Agrocampus Ouest - Pole GéoSAS

65 rue de Saint-Brieuc , Rennes cedex , 35042 , France

Name: ESRI Shapefile

Version: 1.0

OnLine resource

v_bioc_ias_sctr_ias_sessions ( OGC:WMS )

Secteurs d'étude des saumons atlantiques (IAS) par session - Observatoire Sélune

OnLine resource

Download "Brown trout Study Areas (IAT) by session - Sélune Observatory" in shapefile ( WWW:DOWNLOAD-1.0-http--download )

Download "Brown trout Study Areas (IAT) by session - Sélune Observatory" in shapefile

OnLine resource: Observatoire Sélune ( WWW:LINK-1.0-http--link )

OnLine resource: Dispersion et (re)colonisation du cours de la Sélune et de ses affluents ( WWW:LINK-1.0-http--link )

OnLine resource: Rapport d'activité Observatoire des biocénoses aquatiques de la Sélune 2019-2021 ( WWW:LINK-1.0-http--link )

OnLine resource: Observatoire des biocénoses aquatiques de la Sélune - rapport d'activités 2022 ( WWW:LINK-1.0-http--link )

OnLine resource: Observatoire des biocénoses aquatiques de la Sélune - rapport d’activités 2023 ( WWW:LINK-1.0-http--link )

OnLine resource

Télécharger "Secteurs d'étude des saumons atlantiques (IAS) par session - Observatoire Sélune" au format CSV ( WWW:DOWNLOAD-1.0-http--download )

Télécharger "Secteurs d'étude des saumons atlantiques (IAS) par session - Observatoire Sélune" au format CSV

OnLine resource: Salmon abundance index (SAI) ( WWW:LINK-1.0-http--link )

OnLine resource: Rapport d'activités 2024 de l'Observatoire des biocénoses aquatiques de la Sélune ( WWW:LINK-1.0-http--link )

Hierarchy level: Dataset

Conformance result

Date (Publication): 2013-12-10

Explanation: Non Evalué

Pass: No

Statement: Monitoring of amphihaline fish populations in the Sélune is carried out on the main course and its tributaries, both upstream and downstream of the old dams. This allows us to understand the dynamics of these populations before, during and after the dams were demolished. Brown trout, Atlantic salmon, European eel and lamprey (marine, river and brook) are species of high conservation importance. Populations are monitored using various inventory protocols (electrofishing, trapping, DNAe) supplemented by sampling to better characterise the populations (genetics, scalimetry).

The objectives of this monitoring programme are:

- to estimate recruitment levels in 0+ and 1+, cohort development, abundance and density of Atlantic salmon (Salmo salar);

- to monitor biometrics (measurements, scale sampling and scalimetric readings) at reference stations;

- to study intra- and inter-population genetic structure and the impact of migratory individuals and the movement of sedentary trout downstream and upstream of dams on the entire population (fin sampling).

Sampling has been annual since 2022 and biannual before that.

The protocol implemented is the protocol "Gaétan Pottier, Frédéric Marchand, Sabrina Servant, Etienne Prévost. Salmon abundance index (IAS). Guides and Protocols Collection. Scientific electrofishing in continental aquatic environments,

INRAE; OFB, 2022. ffhal-03757386".

The stations (also known as study sectors) were located using a hiking GPS (expected planimetric accuracy <= 20 m).