The main threats it faces are seen to be water abstraction and cormorants, and the fish-eating birds are being culled from Haweswater.

[5] The schelly is listed as a distinct species of whitefish, C. stigmaticus, in FishBase and by the IUCN.

[1][6] Schelly is the common name of four populations of freshwater whitefish in the English Lake District, Cumbria.

The native populations of this fish inhabit the Brothers Water, Haweswater, Red Tarn and Ullswater, and occupy a total area of about 20 square kilometres (7.7 sq mi).

[1] At Haweswater, the fishery officers are now culling all of the cormorants that visit the lake, in order to protect the endangered fish.