Brown trout Study Areas (IAT) by session - Sélune Observatory

The opening of the dams will have a considerable impact on the functioning of trout populations in the Sélune. Restoring the river's ecological continuity will modify population flows, allowing amphihaline sea trout to migrate further upstream, and native trout to move upstream and downstream of the dams. The trout population is monitored at a network of stations covering the entire Sélune basin, using an abundance index carried out every 2 years.

Field campaigns follow the Vigitruite® fishing protocol, developed at INRAE for use throughout France. This index of abundance, related to the surface area of favorable habitats on the watercourse, makes it possible to evaluate the quantity of trout present in the river, resulting from natural reproduction in previous years. Field campaigns are carried out by INRAE and the Fédération d'Ille-et-Vilaine pour la Pêche et la Protection du Milieu Aquatique (FDAPPMA35).

This layer shows the locations of these study sectors by year of study: 2012, 2014, 2018, 2020, 2022 and 2024.

Date (Publication): 2023-01-23T00:00:00

Date (Revision): 2025-07-31

Edition: Mise à jour 2024

Edition date: 2025-07-31

Citation identifier: fr-18007003900276-umrsas-selune-sctr_IAT_selune

Purpose: The purpose of this data is to locate where trout catches were made as part of the Sélune observatory.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
INRAE U3E	Nadine Herrard	nadine.herrard@inrae.fr	Custodian
INRAE U3E	Frédéric Marchand	frederic.marchand@inrae.fr	Point of contact

Maintenance and update frequency: As needed

Theme

Données ouvertes

Theme

Limite

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

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 contact

Organisation name	Individual name	Electronic mail address	Role
UMR 1069 SAS INRA - Agrocampus Ouest	Pole GéoSAS	geosas_adm@framalistes.org	Distributor

Distributor format

Name	Version
ESRI Shapefile	1.0

Digital transfer options

OnLine resource

Protocol	Linkage	Name
OGC:WMS	https://geosas.fr/geoserver/selune/wms?SERVICE=WMS&REQUEST=GetCapabilities	v_bioc_iat_sctr_iat_sessions
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/wfs?service=WFS&version=2.0.0&request=GetFeature&typeName=selune:v_bioc_iat_sctr_iat_sessions&outputFormat=SHAPE-ZIP
WWW:LINK-1.0-http--link	https://programme-selune.com/observatoire-selune/migrateurs-amphihalins-la-reconquete-de-l-amont	Observatoire Sélune
WWW:LINK-1.0-http--link	https://hal.inrae.fr/U3E/hal-03757525v1	Partie D – Livrets de protocoles de pêche à l’électricité : VIGITRUITE ® , indice d'abondance truite (IAT)
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-05167013	Rapport d'activités 2024 de l'Observatoire des biocénoses aquatiques de la Sélune
WWW:LINK-1.0-http--link	https://hal.inrae.fr/SELUNE/hal-03357109v1	Dispersion et (re)colonisation du cours de la Sélune et de ses affluents
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-04839910v1	Rapport d'activité Observatoire des biocénoses aquatiques de la Sélune 2019-2021
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-04839973v1	Observatoire des biocénoses aquatiques de la Sélune - rapport d'activités 2022
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-04840030v1	Observatoire des biocénoses aquatiques de la Sélune - rapport d’activités 2023
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/wfs?service=WFS&version=2.0.0&request=GetFeature&typeName=selune:v_bioc_iat_sctr_iat_session&outputFormat=csv
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-03757525v1	Partie D – Livrets de protocoles de pêche à l’électricité : VIGITRUITE ® , indice d'abondance truite (IAT)

Hierarchy level: Dataset

Conformance result

Title: INSPIRE Data Specification for the spatial data theme Elevation

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 river 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 are demolished. Brown trout, Atlantic salmon, European eel, and lampreys (marine, river, and Planer) are species of high conservation importance. The populations are monitored using various inventory protocols (electrofishing, trapping, DNAe) supplemented by sampling aimed at better characterizing the populations (genetics, scalimetry).

The objectives of this monitoring are:

- to estimate the level of recruitment in 0+, the evolution of cohorts, and the abundance and density of trout (Salmo trutta);

- to monitor biometrics (measurements, scale sampling, and scalimetry) 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 “Trout Abundance Index by Electrofishing” protocol according to the Vigitruite® protocol (Roussel et al. 2023).

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