We wish to accept Gozlan’s (2008) invitation: ‘The aim of this paper is to open a critical debate on the real threat posed by the introduction of non-native fishes’ (p. 107). Gozlan (2008, p. 106) states that: ‘Here I show that on the global scale, the majority of freshwater fish introductions are not identified as having an ecological impact while having great societal benefits.’ We strongly d...