Know more

About cookies

What is a "cookie"?

A "cookie" is a piece of information, usually small and identified by a name, which may be sent to your browser by a website you are visiting. Your web browser will store it for a period of time, and send it back to the web server each time you log on again.

Different types of cookies are placed on the sites:

  • Cookies strictly necessary for the proper functioning of the site
  • Cookies deposited by third party sites to improve the interactivity of the site, to collect statistics

Learn more about cookies and how they work

The different types of cookies used on this site

Cookies strictly necessary for the site to function

These cookies allow the main services of the site to function optimally. You can technically block them using your browser settings but your experience on the site may be degraded.

Furthermore, you have the possibility of opposing the use of audience measurement tracers strictly necessary for the functioning and current administration of the website in the cookie management window accessible via the link located in the footer of the site.

Technical cookies

Name of the cookie


Shelf life

CAS and PHP session cookies

Login credentials, session security



Saving your cookie consent choices

12 months

Audience measurement cookies (AT Internet)

Name of the cookie


Shelf life


Trace the visitor's route in order to establish visit statistics.

13 months


Store the anonymous ID of the visitor who starts the first time he visits the site

13 months


Identify the numbers (unique identifiers of a site) seen by the visitor and store the visitor's identifiers.

13 months

About the AT Internet audience measurement tool :

AT Internet's audience measurement tool Analytics is deployed on this site in order to obtain information on visitors' navigation and to improve its use.

The French data protection authority (CNIL) has granted an exemption to AT Internet's Web Analytics cookie. This tool is thus exempt from the collection of the Internet user's consent with regard to the deposit of analytics cookies. However, you can refuse the deposit of these cookies via the cookie management panel.

Good to know:

  • The data collected are not cross-checked with other processing operations
  • The deposited cookie is only used to produce anonymous statistics
  • The cookie does not allow the user's navigation on other sites to be tracked.

Third party cookies to improve the interactivity of the site

This site relies on certain services provided by third parties which allow :

  • to offer interactive content;
  • improve usability and facilitate the sharing of content on social networks;
  • view videos and animated presentations directly on our website;
  • protect form entries from robots;
  • monitor the performance of the site.

These third parties will collect and use your browsing data for their own purposes.

How to accept or reject cookies

When you start browsing an eZpublish site, the appearance of the "cookies" banner allows you to accept or refuse all the cookies we use. This banner will be displayed as long as you have not made a choice, even if you are browsing on another page of the site.

You can change your choices at any time by clicking on the "Cookie Management" link.

You can manage these cookies in your browser. Here are the procedures to follow: Firefox; Chrome; Explorer; Safari; Opera

For more information about the cookies we use, you can contact INRAE's Data Protection Officer by email at or by post at :


24, chemin de Borde Rouge -Auzeville - CS52627 31326 Castanet Tolosan cedex - France

Last update: May 2021

Menu Logo Principal

Home page

The Oir, Scorff and Bresle river monitoring sites

The Oir, Scorff and Bresle are three rivers that have been monitored by INRAE and the French biodiversity agency OFB for over 30 years. The U3E unit is tasked with managing the monitoring sites. They were initially chosen solely for monitoring migratory salmonids, but have gradually been equipped with instruments for monitoring trends in amphihaline fish communities under the impact of local and global environmental change.

Each site is equipped with a migratory fish monitoring station with upstream and downstream traps. The sites' design, the facilities (field laboratory, workshop etc.) and the various instruments spread around the stream networks enable the study of different biotic and abiotic compartments throughout their catchments. These rivers have now been monitored in detail for over 35 years, producing extensive chronological data series.

The Oir, Scorff and Bresle rivers, along with the Nivelle, which is monitored by the Ecobiop research unit at Saint-Pée-sur-Nivelle, are used for the work of ORE DiaPFC (monitoring unit for diadromous fish in coastal rivers) and the OFB/INRAE research hub Gest'Aqua (management of aquatic ecosystems in farming areas).

These four rivers are listed as Index Rivers by ICES, the International Council for the Exploration of the Sea, which is tasked with making recommendations for the international management of fish stocks.

Oir capture site

The Oir site

Length: 21 km
Catchment: 86 km2

The Oir is a tributary of the Sélune, which drains into the bay of Mont Saint-Michel. The upstream reaches of the Sélune are inaccessible to migratory fish because their way is blocked by an impassable dam 15 km from the sea. The fish can only spawn in two tributaries downstream of the dam, the Beuvron and the Oir. The Oir is the more productive of the two spawning grounds.

Runs of fish migrating up- and downstream are monitored by means of traps at the Moulin de Cerisel station.
A former fish farm next to the station is used for stocking experimental animals.

Scorff - Moulin des princes capture site

The Scorff site

Length: 70 km
Catchment: 480 km²

The Scorff is a small river that drains into the Atlantic in Lorient harbour in Brittany. The fish monitoring station is on the lower part of the main river, at the tidal limit, just at the start of the estuary. This means that fish trapping and related work continues all year round. Species trapped include salmon, shad and lamprey.

The monitoring station at Pont-Scorff is open to the public, with a purpose-designed visitor reception space.

La Bresle river

The Bresle site

Length: 72 km
Catchment: 748 km²

The Bresle is a coastal river in Normandy whose headwaters are in the Seine-Maritime département and which drains into the Channel at Trépot.

To monitor migratory fish, traps are placed to intercept them on their way seawards, or going back up the river after their sea-dwelling stage. The monitoring station comprises two complementary trapping sites, one at Eu (in Seine-Maritime), 3 km from the sea, and one at Beauchamps, in the Somme département, 15 km from the sea. Fish trapping (of salmon, lamprey, eel etc.) and related work goes on all year round.