Shetland Islands Council’s Environmental Health has received notification from SEPA to confirm that there is Blue Green Algae in Loch of Cliff, Unst, Shetland.
Notices will be posted on 17 June 2016 next to the Loch of Cliff warning that contact with algal scum should be avoided.
Adjoining landowners and fishing interests have been advised of the situation, as has NHS Shetland.
At this stage there is no adverse effect on water supplies.
Fishermen have been told to stop taking shellfish from the Kyles of Eriskay in the Outer Hebrides because of health risks.
Western Isles Council has identified raised levels of shellfish toxins, following routine sampling on behalf of Food Standards Scotland.
The toxins are known to accumulate within shellfish such as mussels, cockles and razor clams and at certain levels consumption may pose a risk to health, said the council.
“Commercial shellfish harvesters in these areas have been contacted by the council and steps taken to postpone harvesting until algae levels subside,” said a spokesman.
“It is a sensible precaution to avoid eating shellfish from these areas until further notice.
“The council is monitoring the situation and will inform the public when the situation improves.”
An injured fisherman was airlifted from a boat off the Sutherland coast today with a badly crushed hand.
The alert was raised by the crew of the Wick-registered Sparkling Line at about 6.40am when it was 20 miles north of Cape Wrath.
The man, who had injured his hand during 13ft high sea swells, was winched onboard a coastguard helicopter from Stornoway on Lewis.
He was flown to Aberdeen Royal Infirmary. His condition is unknown.