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

It is the fourth time in around three years 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, the council has urged owners to thoroughly wash the animal with clean water and seek advice from a vet.

Councillor Chris Morgan, cabinet member for waste, leisure and green spaces, 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.

He added: “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”.