Focus on IS - integration of PAS data (atlantic salmon)
Programme Sélune
SISelune
Focus on IS - integration of PAS data (atlantic salmon)

Focus on IS - integration of atlantic salmon PAS (Ponctual Abundance Sampling) data

Banking, dissemination, and visualization of data and metadata: Abundance and catches of Atlantic salmon (PAS)

What data are we talking about?

This article deals specifically with the integration into the SI Sélune information system of data associated with monitoring carried out on juvenile Atlantic salmon as part of the IAS (Salmon Abundance Index) abundance monitoring program. 

As part of the Sélune Observatory, annual 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 given station. The protocol makes it possible to count the juveniles of the year (aged 0+) whose abundance reflects the renewal of generations within the population and survival after hatching in winter breeding areas. Field campaigns are carried out by INRAe and the Manche and Ille-et-Vilaine Departmental Federations for Fishing and the Protection of the Aquatic Environment (FDAAPPMA50 and FDAAPPMA35).

The data made available in SISélune complies with INSPIRE and is based on the F.A.I.R. Data principles.

The related metadata

Three metadata sheets accompany the abundance and catch data for Atlantic salmon from the Sélune observatory. These sheets describe the data provided, how it was acquired, its temporal and spatial characteristics.

pictogram representing an atlantic salmon

 

View / Download data

1. Via metadata

Each metadata sheet provides download links to data in CSV, JSON and shapefile (SHP) formats.

2. Via the web mapping portal

The mapping portal, accessible via the url: https://geosas.fr/selune/#, presents these datasets in the "Sélune Observatory" theme and the "Atlantic Salmon" sub-theme.

It allows you to view the scientific electric fishing areas sampled as part of the PAS protocol.

You can change this campaign by clicking on the "V" icon located under the layer caption. This will display a drop-down list titled "Campaign selection" allowing you to select the desired year.

It allows you to view abundance data by age class and scientific fishing sector. It also allows you to view biometric data associated with the catches made.

You can change this campaign by clicking on the "V" icon located under the layer label. This will display a drop-down list titled "Campaign selection" allowing you to select the desired year. 

It is also possible to change the display mode for this data: Absence/Presence (default) or abundance classes by clicking on the "V" icon located under the layer legend. This brings up a drop-down list labeled "Analysis" allowing you to select the desired display mode.

You can change this campaign (see below) but also change the way to view the data : Absence/Presence (default way) or abundance index classes by clicking on the “V” icon located under the layer legend. This will bring up a drop-down list “Analysis” allowing you to make your choice. 

NB : Several visualization alternatives exist for absence/presence, offering different colors (this allows the absence/presence of salmon and other species (trout, eels, etc.) to be displayed on the same map).

Once the campaign has been selected, it is possible to view additional data specific to each station for the selected campaign.

Once the campaign has been selected, it is possible to view additional data specific to each station for the selected campaign, including: 

  • The IAS index value for the selected sector and campaign,
  • Contextual data on fishing activity (duration, number of hauls, operator) for the selected sector and campaign,
  • Biometric data (forked length and weight) for all Atlantic salmon catches in the selected sector and campaign.

The selected campaign also allows you to:

  • Access a page on the website providing explanations about the observatory's scientific monitoring,
  • Access the metadata sheets associated with these datasets directly,
  • Download the data in CSV and JSON format.

Example of a PAS map on the web mapping portal:

3. via the map server

The access urls for the Sélune IS data layers are as follows:

Layers used to retrieve PAS data :

  • Atlantic salmons Study Areas (IAS) by session - Sélune Observatory: v_bioc_ias_sctr_ias_sessions
  • Abundance of Atlantic salmon (IAS) - Sélune Observatory: v_bioc_ias_ab_ias
  • Atlantic salmon catches (IAS) - Sélune Observatory: v_bioc_ias_ind_ias

 

 

 

Modification date: 09 February 2026 | Publication date: 23 January 2026 | By: L'équipe Sélune