Mise à jour 2024

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

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

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

No public access restriction

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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+ and 1+, 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 “Gaétan Pottier, Frédéric Marchand, Sabrina Servant, Etienne Prévost. Indice d’abondance saumon

(IAS). Collection Guides et Protocoles. La pêche scientifique à l’électricité dans les milieux aquatiques

continentaux, INRAE; OFB, 2022. ffhal-03757386".

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

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32b2d23e-0f67-46fb-ad72-110514f1c8ee

ISO 19115

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