Identified topics newspaper articles, Facebook conversations and survey comments about European flounder. The three identified topics ‘Arrival and spread of European flounder’ (pink), ‘General Monitoring/surveying’ (green) and ‘European flounder in recreational angling’ (blue) and their respective 10 most frequent words are displayed in barplots on the left-hand side. The calculated topic composition for each of the six corpora are pictured in donut plots on the right-hand side A newspaper before 2013 (n = 72 articles) B newspaper 2013 – Oct. 2019 (n = 20 articles) C newspaper since Oct. 2019 (n = 6 articles) D facebook 2013 – Oct. 2019 (n = 25 posts) E facebook since Oct. 2019 (n = 13 articles) F survey comments (n = 22 comments)