TOXIC blue green algae was discovered at Muckross Bay while dogs "paddled" in the water. 

The report, which was lodged to DAERA by a concerned local man on Wednesday of this week, shows substantial amounts of the substance, including thick coatings on nearby rocks. 

Blue green algae can be highly poisonous and even fatal to dogs, and is harmful to humans. 

It understood that both people and dogs were "paddling" in the water at the time. 

The report on DAERA's 'Bloomin Algae' app stated: "Evident potential blue green algae visible along shoreline and on the surface of Muckross Bay. 

"Bright green coating on stones and strand.

"People using shoreline for paddling and swimming. Dogs also in water. Spotted in passing." 

Muckross bay is a popular destination for tourists and local people alike. 

The report follows another report of the substance at Crevenish Castle, Kesh on the same date.

 This was verified and "considered correct" by the Department. 

A spokesperson from Fermanagh and Omagh District Council said: "The Council advises residents and visitors to be aware of the potential presence of blue green algae in all waterways throughout the District at this time due to the potential risk to the health of humans and animals."