Follow-up measures

Monitoring of fisheries resources

Objectives and methodology

The objective of this monitoring is to assess the impacts of the construction and operation of the offshore wind farm and its connection on the fishery resource (shared monitoring with RTE). 

To do this, the comparison between the reference state and the environmental monitoring carried out throughout the life of the project must make it possible to decide on the effects of the project on the fishery resource.

Several follow-ups are implemented:

Experimental fishing


Tides observed

Analysis of existing data

Specific monitoring of cuttlefish spawning

Compartments studied

The list of species monitored goes beyond regulatory requirements; it has been validated with the Côtes d'Armor maritime fisheries and marine farming committee and includes the following species:

  • Bentho-demersal species using a frank trawl (soft substrate) and a Canadian trawl (hard substrate);
  • Large shellfish in the shellfish trap or shellfish net;
  • Bivalves other than scallops at the Hamon bin;
  • Scallops using a flap dredge (soft substrate) and a roller dredge (hard substrate);
  • The whelks in the locker;
  • Adult cuttlefish in the trap (on-board observations), as well as monitoring of spawning (laying of lines).

In addition to experimental fishing, on-board observation campaigns are carried out for most professions with professionals working in the bay of Saint-Brieuc, and more specifically in sectors close to the site of the future wind farm and its connection. . These campaigns (around 70 per year since the end of 2019) aim to obtain additional indicators.

Location of actions

The selection of stations was carried out in two stages: 

  • Areas more or less close to the field were selected to evaluate the impacts of the work and the operating phase according to a gradient of incidence
  • Specific stations have been defined within its areas in consultation with the CDPMEM22 (in particular on the basis of knowledge of the fishing zones

Schedule and Status


Measure currently implemented

The mission execution schedule was defined in consultation with CDPMEM 22 which proposed target months for each species, based on the practice of professionals. Please note that the months selected may vary, notably depending on the weather, the availability of fishing professionals with whom the service providers embark, etc.

    Monitoring by experimental tide began in September 2018 for the reference state before work, will continue during the construction phase between 2021 and 2023 and also the first 3 years of operation, i.e. from 2024 to 2026 then every 5 years ( years n+1, n+2, n+3, n+5, n+10, n+15, n+20, n+25).

    Additional monitoring has been carried out since the end of 2019.

      Bentho-demersals O O
      Spider crab O O
      Bivalves O
      Scallop shells O
      Whelks O O
      Cuttlefish O O O O

      All follow-up measures

      Reduction measures

      Compensation measures

      Accompanying measures