A public health warning has been issued over a bacteria that can be deadly to pets and livestocks.
Bathers and animal owners are being warned of the danger posed by blue-green algae amid forecasts of hot weather.
The bacteria was recently discovered in the Forest of Ae at Loch Ettrick, a spot popular with swimmers and paddleboarders.
Public health consultant, Dr Andrew Rideout, said: “The recent spate of warm weather may see people tempted to cool off in ponds and lochs, and for owners to allow dogs to take a dip or have a
drink.
“There are dangers around swimming in natural waters at any time, but at this time of year a key concern is the presence of blue-green algae.
“Blue-green algae emits toxins.
“A human or pet swimming through it with their head just above the water can be at serious risk.
“For that reason, if people are wishing to swim to cool down in the hot weather we would advise using public swimming pools.
“Anyone who does venture into natural waters should be extremely vigilant for the presence of this algae, which may not always be immediately apparent.
“Walking past waters with blue green algae should not pose a risk, but anyone who does enter these waters and starts to feel unwell should seek medical advice immediately.”
Blue-green algae can only be seen when it clumps together and looks like green flakes or bundles or brown spots.
When it blooms, it can appear as if a blue-green scum has appeared on the surface of the water and may look like foam.
Dead fish can sometimes be seen in areas of water with high concentration of the toxic
bacteria.
Pets should not be allowed to drink from these waters.
The council reported on Wednesday that the algae had been discovered at Loch Ettrick.
A spokesman said: “Whilst is good to be active and enjoy the outdoors it’s a sensible precaution for you, your children, and animals not to drink from the loch and to avoid contact with the algae and water near it.
“This advice remains in place throughout the season as Loch Ettrick blooms fairly regularly each year.”