There are also smaller populations of Brown trout (Salmo trutta), Arctic char (Salvelinus aplinus) and European whitefish (Coregonus lavaretus).

[3] For generations, Semsvannet has been utilized as a lake for swimming, especially among the, at the time, permanent residents at Tangen, et cetera.

However, situated even closer to the lake, by far – at the foot of the ridge Skaugumsåsen – is the cultural house Tangen, which during the first half of the twentieth century was the domicile of the Family Kaspersen; who among others frequently was visited by the Norwegian cultural personality and friend Alf Prøysen at social gatherings and feasts arranged by the family.

[7][8] To have the songwriter, troubadour and friend Alf Prøysen nearby, made a mutual impact, and inspired the just a few years younger son of Tangen, Karsten Kaspersen.

Who in his turn wrote several songs dedicated to the area, and how it was to live and grow up close to the lake Semsvannet and at Tangen in the first half of the twentieth century (i.e. around the years 1900 to 1950).