• Involvement of recreational anglers in the eradication of alien brook trout from high altitude lakes

      Tiberti, Rocco; Ottino, Michelle; Brighenti, Stefano; Iacobuzio, Rocco; Rolla, Matteo; von Hardenberg, Achaz; Bassano, Bruno; Gran Paradiso National Park, University of Pavia, Università degli studi di Trento, Fondazione E. Mach, Università degli Studi di Milano, Swansea University, University of Chester (Gran Paradiso National Park Agency, 2017)
      Stocking programmes for recreational angling are primarily responsible for the spread and ecological impact of introduced sh in high-altitude, originally shless lakes. In 2013, the Gran Paradiso National Park started an eradication campaign of brook trout by intensive gill-netting. Local anglers were invited to attend two angling sessions to start the eradication before gill-netting in an experimental lake, as part of an education action devoted to these critical stakeholders. The angling sessions turned out to be a valuable help for the eradication campaign and the aim of this study is to report on the outcomes of these angling sessions. Angling techniques were highly size-selective, removing a substantial part of the adult population and of the sh biomass, but their contribution to the eradication of small sh (<15cm) was irrelevant. Therefore, angling cannot completely eradicate age-structured populations. However, there is scope to use angling sessions as a support for eradication campaigns and as an emergency measure for recent sh introduc- tions. Similar actions should be considered whenever a sh eradication programme is planned. These ndings, however, do not imply a general endorsement for angling within protected areas.