N.S. reminds residents to be cautious of blue-green algae in freshwater lakes

Blue-green algae in this undated file image.

The Nova Scotia government is reminding residents to be cautious of blue-green algae.

Also known as cyanobacteria, blue-green algae is found in freshwater lakes. The government says the plant-like substance is more likely to grow in warm weather.

“Algae blooms can look like fine grass clippings in the water, spilled paint, pea soup or sometimes like a thick scum on the surface,” reads a news release from the province.

“Algae mats can be found in shallow areas of lakes and rivers and along the shoreline; they often look like clumps of vegetation and may appear black, brown or dark green in the water.”

The province says testing is unreliable in large bodies of water because blue-green algae can move around, reform and recur.

The government warns mats may detach from the bottom and wash up on the shoreline, where they look grey and have a foul odour that may attract dogs. Ingesting blue-green algae can be fatal for pets.

When people come in contact with contaminated water it can cause itchy eyes and skin. The province says symptoms worsen if the water is swallowed or breathed in, which can lead to headaches, fever, stomach pain, diarrhea, nausea or vomiting.

“Climate change is causing more blue-green algae in our lakes and other freshwater bodies. As summer approaches, we are reminding Nova Scotians about the tools available to help them recognize and prevent exposure so they can enjoy our lakes and other freshwater safely,” said Timothy Halman, minister of Environment and Climate Change, in the release.

To reduce your risk, the province recommends:

• scanning the water and shoreline for blue-green algae before going into fresh water or letting children and pets play in it
• avoiding contact with blooms
• not drinking fresh water when swimming or enjoying lakes
• calling a veterinarian if a pet comes into contact with a bloom
• reporting sightings by calling 1-877-936-8476

For more Nova Scotia news, visit our dedicated provincial page