Follow-up actions

Monitoring of the fisheries resource

Objectives and methodology

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

To do so, a comparison between the baseline state and the environmental monitoring conducted throughout the life of the project must make it possible to rule on the project's effects on the fishery resource.

Several follow-ups are implemented:

Experimental fisheries


Observed tides

Analysis of existing data

Specific monitoring of cuttlefish spawning

Compartments studied

The list of species monitored goes beyond the 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 pair of set trawls (soft substrate) and a Canadian trawl (hard substrate) ;
  • Large crustaceans in the crustacean trap or in the crustacean fillet ;
  • Bivalves other than scallops in the Hamon skip ;
  • Scalloping using a flap dredge (soft substrate) and a roller dredge (hard substrate) ;
  • Whelk in the locker;
  • Adult cuttlefish in the trap (onboard observations), as well as monitoring of spawning (laying of orin).

In addition to experimental fishing, onboard observation campaigns are carried out for most trades with professionals working in the Bay of Saint-Brieuc, and more specifically on sectors close to the site of the future wind farm and its connection. These campaigns (approximately 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 assess the impacts of the work and the operation phase according to an impact gradient.
  • Specific stations have been defined within its areas in consultation with the CDPMEM22 (in particular on the basis of knowledge of the fishing zones, the fishing grounds and the fishing activities of the fishing industry).

Planning and Status


Measure currently in place

The timetable for carrying out the mission was defined in consultation with the CDPMEM 22, which proposed target months for each species, based on professional practice. It should be noted that the months selected may vary, depending in particular on the weather, the availability of the fishing professionals with whom the service providers embark, etc.

    Monitoring by experimental tide began in September 2018 for the baseline before works, will continue during the construction phase between 2021 and 2023 and also the first 3 years of operation, i.e. from 2024 to 2026 and 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.

      S O N D J F M A M J J A
      Bentho-demersal O O
      Spider crab O O
      Bivalves O
      Scallops O
      Whelks O O
      Cuttlefish O O O O

      All follow-up actions

      Reduction measures

      Compensation measures

      Accompanying measures