“…Other documents noted that the stickleback was absent from the upper Danube system until the late 19th century (von Siebold, 1863;Münzing, 1963;Ahnelt, 1986) and most authors agree that the only natural population in Switzerland north of the Alps resided near Basel (Figure 3; Schinz, 1837;Wittmack, 1875;Leuthner, 1877;Fehling et al, 1881;Schulze, 1892;Rauther, 1926;Scheffelt, 1926;Muckle, 1972;Ahnelt, 1986;Ahnelt and Amann, 1994;Ahnelt et al, 1998;Paepke, 2002;Altman et al, 2013), that also served as a popular source location of stickleback for aquarium fish traders in Switzerland (Steinmann, 1936). This historical record implies that stickleback were present in the Lake Constance basin before they established in the upper Danube (Vogt and Hofer, 1909;Gaschott, 1941;Berinkey, 1960;Balon, 1967;Ahnelt, 1986;Cakić et al, 2000;Holcik, 2003;Polačik et al, 2008;Lisjak et al, 2015), making a natural colonization from the Danube unlikely.…”