Potentially harmful blue-
The bloom has the potential to discharge onto the adjacent Melbost Beach.
Western Isles Council warned parents to keep children away from the algal scum.
Dog walkers using the beach are also urged to ensure their pets do not come into contact with the bloom.
A council spokesman said: "It is a sensible precaution for you, your children and your animals to avoid contact with the scum and the water close to it."
He added: Swallowing the water or algal scum can cause stomach upsets or more serious health effects.
"Contact with the water or algal scum can cause skin problems.
Warning over potentially toxic algae on island loch
27 May 2016
Melbost beach