Follow-up measures

Visual monitoring of marine mammals and birds

Objectives and methodology

The main objective of the “visual” monitoring of marine mammals and birds is to determine the impact of the work and operation of the wind farm off the coast of Saint-Brieuc Bay on these groups. These monitoring will also improve local knowledge. These were last communicated to the CGS in April 2019.

Boat observations are carried out by two observers simultaneously, each covering one side of a boat and focusing on a 300 m swath.

A transect-type protocol is also deployed for high-definition aerial monitoring. The films made during outings are analyzed back on land.

Location of actions


Schedule and Status


Measure currently implemented

This surveillance measure will be implemented several times:

Between March 2020 and March 2021:

0 boat trips per month

Between March 2020 and 2027*:

0 plane trip per month

* Corresponding to the pre-construction and construction phases, as well as the first 3 years of operation.

In the operating phase (after 2025*):

0 plane trip every 5 years

* Monitoring will also be maintained during dismantling.

All follow-up measures

Reduction measures

Compensation measures

Accompanying measures