In the context of an increase of offshore floating wind farm project, it is important to consider the livelihood of professional fishermen facing the implementation of the offshore wind farms. Indeed, the impacts on the environment and the repercussions on fishermen are known. However, the degree of vulnerability of each group defined by the characteristics of their activities facing the wind farm is unknown. To understand the interaction socio-ecosystem/fishermen, a composite index followed the exposition, sensitivity and adaptive capacity dimension are built to assess the vulnerability of the fishermen facing the implementation of a pilot farm off Groix and Belle-Iles coast (France). The result of the case study shows a difference of vulnerability with a low score for the fishermen with large vessels using active gears and a high score for the fishermen with small vessel using passive gears. This difference can be explained by the dependence of the area and lack of adaptive capacity in term of human, natural, social, and economic capital resources. Following this result, active vulnerability-based management can be used by stakeholder and manager to reduce vulnerability and maintain the fisheries based-livelihood and the well-being of the fishermen.
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