Poisonous algae appears in Esthwaite Water
A warning has been issued after potentially dangerous blue-green algae was spotted in a Cumbrian lake.
The Environment Agency said people and animals should avoid Esthwaite Water, close to Windermere, after concerns were raised by South Lakeland Council.
Swallowing the water or algae can cause stomach upsets and skin irritation.
Last year the toxic algae was responsible for the cancellation of the Great North Swim when it polluted Windermere.
South Lakeland's principal environmental health officer, Andrew Smith, said, "Blue-green algae can potentially make people feel quite ill if swallowed or even by just swimming in it.
"We just want people to be aware of the affects and are asking people to be extra careful and vigilant when using the lakes and rivers for recreational purposes during the summer months.
"The public should observe any notices near affected areas and avoid contact or drinking the water."