Gasterosteus spp (three-spined stickleback)

Three-spined stickleback ( Gasterosteus spp) were recorded in six lakes in Projet Lac (Table 11). Gasterosteus gymnurus is native to Switzerland in Lake Maggiore and in the Rhine near Basel. Although currently included in G. gymnurus, the native populations in lakes Maggiore and Garda 7 belong to the northern Adriatic lineage.This lineage is morphologically and genetically distinct and should be recognised as a separate species [168, 169, 170]. G. gymnurus recorded by Projet Lac in Lake Geneva were not native to the lake.This species was first documented in the lake in 1872 [171] and belongs to a West-European (middle Rhone) lineage [172].