The vendace has only ever been known as a native species at four sites in Britain: Bassenthwaite Lake and Derwent Water in the English Lake District, and the Castle Loch and Mill Loch in Lochmaben, Scotland.
Idwal Fisher died in Lochmaben, Scotland, having retired to live with his daughter in Lockerbie.
Robert de Brus Lord of Skelton in the Cleveland area of Yorkshire, was a notable figure at the court of King Henry I of England, where he became intimate with Prince David of Scotland, that monarch's brother-in-law.
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The name Loch Mhabain is possibly a corruption of Loch Mhaol Bheinn ("Lake on the bare mountain"), or may mean "Loch of Mabon", an ancient Brythonic god, as the Roman name of the area was Locus Maponi, according to the Ravenna Cosmography.
The lake is believed to be the last remaining native habitat of the vendace (Coregonus vandesius) fish from the 4 originally known sites: Bassenthwaite Lake and Derwent Water in the Lake District and the Castle Loch & Mill Loch in Lochmaben.