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This article is about the place of passions and amateur knowledge as well as tactics in environmental mobilisations. Narrating the history of ANPER-TOS, a non-governmental organisation created by fly-fishermen which has attracted several legal professionals, it presents the encounter of two worlds and the elaboration of an original form of collective action through litigation. If anglers and legal professionals brought together their own knowledge, about aquatic ecosystems for the first ones and about law for the second ones, their cooperation facilitated the development of a new kind of expertise thanks to their practice and collective mètis. This case study questions the significance of boundaries between amateur and expert knowledge in relation to environmental issues.