[2] This fish can reach 24 cm (9.4 in) in length and has a blunt snout with the mouth in subinferior position.

Its lower fins have no white margins and its flanks are silvery to yellowish with pale blue spots; the belly can have a reddish color.

[3] Salvelinus profundus was still a commercial species in the 1960s but the eutrophication of Lake Constance, which began in the 1950s and peaked in 1979, is thought to have affected egg development.

Surveys undertaken in the last ten years failed to find any evidence of the survival of this deep-water trout, as well as of the Lake Constance whitefish (Coregonus gutturosus), another fish species driven recently to extinction.

However, the fish species was rediscovered in 2016 during 'Project Lac', a marine survey undertaken by the Swiss Federal Institute of Aquatic Science and Technology.