Hélène Peltier and Vincent Ridoux are biologists and ecologists by training. Their core activity is to contribute to producing knowledge on the biology, ecology and conservation status of marine mammals in the area in order to inform environmental policies. In parallel, they had the opportunity to meet with and observe most of the actors or stakeholders involved in the topic, notably during numerous working group meetings, both at national and international levels. All cetaceans are legally protected in France since 1970, prohibiting intentional catch, trade, transport, consumption and so on. Reinforced by EU Directive Habitats, Annex IV, 1992. Yet limited illegal consumption still exists in the 2020’s. Now bycatches in fishing gears is widespread.