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A mixed shoal of young perch and roach.
A mixed shoal of young perch (Perca fluviatilis) and roach (Rutilus rutilus) (Photograph by Ian J. Winfield).

Background

Crossing Frontiers in Tackling Pathways of Biological Invasions

GB Non-native Species Information Portal: documenting the arrival of non-native species in Britain

Implementing the European policies for alien species – networking, science, and partnership in a complex environment

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