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Poisonous blue-green algae has been found at Pen y Fan Pond, Caerphilly County Borough Council has confirmed.

It is the second time in little over a year that blue-green algae has been discovered at the pond, which is near Oakdale.

Blue-green algae, also known as cyanobacteria, occurs naturally in rivers, streams and lakes and can multiply and form ‘blooms’ during periods of hot weather.

The algae can produce toxins harmful to both humans and animals, causing rashes and irritation.

The RSPCA and the British Veterinary Association have both reported deaths to animals associated with blue-green algae, including pets.

In a statement, the council urged residents to keep themselves and their pets away from the water.

“Should pets come in contact with the water, owners are advised to thoroughly wash the animal with clean water and seek precautionary advice from a qualified vet,” the statement said.

Numerous water-based activities take place at the pond, such as paddle boarding and fishing – but these have been advised against while the poisonous algae remains in the pond.

Councillor Nigel George, Cabinet Member for Environment and Neighbourhood Services, said: “This advice certainly isn’t intended to cause undue concern and worry, however it is important that no recreational activities, including fishing or public access takes place and that residents and visitors are aware that animals should not be allowed to enter the water of Pen y Fan Pond.

“Signage has been placed around the Pond and regular inspections of the body of water will continue to take place. We will continue to work alongside Natural Resources Wales to address this issue”.

Anyone with concerns about blue-green algae can contact Caerphilly County Borough Council’s Environmental Health team on 01443 811 355.