The Lac de la Plagne is a particularly deep natural lake (19 m). It is currently privately managed and depends on the association of the Lacs de Montagne de Landry-Peisey which regularly stocks it. Brown trout, brook trout and lake trout populate its waters. The lake trout originated in northern America, in the area between the Great Lakes and Alaska and was introduced here in 1964. This species is monitored by tagging the young fish.