There is a story connected to Loch Druich and three brothers who happened across a troupe of merfolk. One night the brothers were by the loch side when they saw a group of seals come up onto the beach and shred their furry skins. Beneath the skins were naked people, who danced together on the shore.
Until the middle of the 18th century bulls were sacrificed on August 25th (St Maerlrubha’s Day) to dragons that dwelt in the lake. These may have been akin to the creatures still reported in other Scottish Lochs to this day.
Taken from an article by Richard Freeman.