A warning has been issued of an Algal Bloom in Loch Nan Ritheanan, Keose, in North Lochs.
People are advised that swallowing the water or algal scum can cause stomach upsets or more serious health effects.
And contact with the water or algal scum can cause skin problems.
It is therefore a sensible precaution for you, your children and your animals to avoid contact with the scum and the water close to it.
For further information, contact the Environmental Health Team of Comhairle Nan Eilean Siar on 01851 822694.