Few other animal species on Hardangervidda have been as much the focus of scientific research as the spotted trout. The spotted trout is considered to be a genetic variant of brown trout. It lives in parts of the Krækkjav water system. Otherwise, on a world scale, this species is only found in a small area in Kaukasus, and possibly also in a lake in Rondane.
Plants that grow in and beside water have to be prepared for marked and rapid changes in their living conditions. They must be able to tolerate living under water without drowning, and getting totally dried out without whithering. Many swamp plants are well adapted to these kinds of changes.