I have kept Callochromis stappersi from this location and there are many other species in the hobby from it as well,but I have not found a map with Kashenge on it or info to where it is.It might be spelled differently in other languages possibly?
There is a village of Kashenge (pop. around 1,900) in the Kagera region, which borders Lake Victoria, but not Lake Tanganyka. Kashenge is located near Katoma which is just west (inland) of Bukoba. I don't think there's any fish collecting going on there. I can't find it on a map, but I found a census document describing it. Maybe there is another place of the same name on lake Tanganyka which is also too small to be on a map.???
I am really thinking now that Kashenge is Kashenke on the African Diving map or near it.I have a book that has a Callochromis stappersi Cherry Head caught at Katoba which on Google maps is just a little south of Kashenke.Another reason I believe this may be the collection point is that the O.nasuta Kashenge have yellow fins with a dark body shown in this photo
O.nasuta a little North at Kekese are similar with yellow fins but with a lighter body and the one south at Mpimbwe are said to be black by Airfish and African Diving.
It could be another location that gets confused from translation or like DJ said about collectors changing the location name.