Know more

Our use of cookies

Cookies are a set of data stored on a user’s device when the user browses a web site. The data is in a file containing an ID number, the name of the server which deposited it and, in some cases, an expiry date. We use cookies to record information about your visit, language of preference, and other parameters on the site in order to optimise your next visit and make the site even more useful to you.

To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

Ghostery is available here for free: https://www.ghostery.com/fr/products/

You can also visit the CNIL web site for instructions on how to configure your browser to manage cookie storage on your device.

In the case of third-party advertising cookies, you can also visit the following site: http://www.youronlinechoices.com/fr/controler-ses-cookies/, offered by digital advertising professionals within the European Digital Advertising Alliance (EDAA). From the site, you can deny or accept the cookies used by advertising professionals who are members.

It is also possible to block certain third-party cookies directly via publishers:

Cookie type

Means of blocking

Analytical and performance cookies

Realytics
Google Analytics
Spoteffects
Optimizely

Targeted advertising cookies

DoubleClick
Mediarithmics

The following types of cookies may be used on our websites:

Mandatory cookies

Functional cookies

Social media and advertising cookies

These cookies are needed to ensure the proper functioning of the site and cannot be disabled. They help ensure a secure connection and the basic availability of our website.

These cookies allow us to analyse site use in order to measure and optimise performance. They allow us to store your sign-in information and display the different components of our website in a more coherent way.

These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

These cookies are deleted at the end of the browsing session (when you log off or close your browser window)

Our EZPublish content management system (CMS) uses the XiTi cookie to measure traffic. Our service provider is AT Internet. This company stores data (IPs, date and time of access, length of the visit and pages viewed) for six months.

Our EZPublish content management system (CMS) does not use this type of cookie.

For more information about the cookies we use, contact INRA’s Data Protection Officer by email at cil-dpo@inra.fr or by post at:

INRA
24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal

Home page

Total Authorised Catch (TAC)

To make sure that the salmon population replacement rate is sufficient, salmon fishing is managed by establishing and enforcing a Total Authorised Catch (TAC) for each river catchment,.

A TAC is defined as the number of salmon that can be caught without endangering the population. The TAC system has been in operation on the rivers of Brittany and Lower Normandy since 1996 and in Upper Normandy and the Artois-Picardie water authority area more recently.

How TAC works

Salmon populations are made up of two types of fish:

  • Spring salmon. These are salmon that have spent several winters at sea and are liable to be caught in our rivers between March and June;
  • Grilse. These are salmon that have spent only one winter at sea and are liable to be caught in our rivers between June and October.

During the fishing season, a simple rule is applied to distinguish between grilse and spring salmon: any catch equal to or larger than the size set by COGEPOMI (Comité de Gestion des Poissons Migrateurs) is regarded as a spring salmon. For the Armorican massif catchments, that size is 67 cm). At the end of the year, the formal distinction between spring salmon and grilse is based on interpretation of each individual's life history from examination of sampled scales.

To adjust the TAC to management requirements for each catchment: 

  • specific "spring salmon" TAC is set, in terms of numbers of fish. If the TAC for spring salmon is reached, the catchment's fishery can be closed temporarily, until it is reopened for grilse.
  • An overall TAC is the overall number of salmon that can be harvested from the catchment. If this TAC is reached, the fishery can be closed for the rest of the season. It is calculated according to the types and morphological characteristics of the salmon caught.