Date (Publication)

2025-08-05T00:00:00

Edition

Mise à jour 2025

Citation identifier

fr-18007003900276-umrsas-selune-v_bioc_ias_ab_ias

Purpose

The purpose of this data is to estimate changes in juveile atlantic salmon abundance as part of the Sélune Observatory.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
INRAE UMR DECOD	Jean-Marc Roussel	jean-marc.roussel@inrae.fr	Point of contact
U3E Unité Expérimentale Ecologie Ecotoxicologie aquatique	Clarisse Boulenger	clarisse.boulenger@inrae.fr	Point of contact
Agence l'Eau Seine Normandie AESN		aesn@aesn.fr	Originator
U3E Unité Expérimentale Ecologie Ecotoxicologie aquatique	Frédéric Marchand	frederic.marchand@inrae.fr	Point of contact

Maintenance and update frequency

Annually

Place

• Open data

• atlantic salmon

• abundance

• Dam removal

Keywords

• Selune river

• France

• Normandy

INSPIRE themes

Thésaurus INRAE

• dam

• poisson migrateur amphihalin

• abundance index

• salmon

Use limitation

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

Use limitation

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

Access constraints

Other restrictions

Use constraints

License

Other constraints

No public access restrictions

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

Hierarchy level

Dataset

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 objective of this monitoring is:

- to estimate the recruitment level in 0+ and 1+, the evolution of cohorts, abundances and densities of Atlantic salmon (Salmo salar);

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

- study intra- and inter-population genetic structure and the impact of individuals migrating downstream and upstream of dams on the entire population (fin sampling).

Sampling has been carried out annually since 2022 and biannually prior to 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).

Metadata

File identifier

bfd4b257-d942-4469-a5af-9043cfd7ff2a XML

Metadata language

fre

Character set

UTF8

Parent identifier

e91b4cb1-252d-4ae9-bdf4-24366af7a87c

Hierarchy level

Dataset

Date stamp

2026-02-18T14:52:52

Metadata standard name

ISO 19115

Metadata standard version

1.0

Metadata author

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

Other language

Language	Character encoding
English
French	UTF8