Algae Precautions Recommended
A bloom of potentially toxic algae is now gone from one of three affected Nova Scotia lakes, but people should not swim in, or drink from, water sources where the algae is present.
The algae's scientific name is cyanobacteria, also called blue-green algae or pond scum. It usually has a bluish-green, grassy or soupy appearance when it occurs on the water's surface. It may have a distinct odour.
Department of Environment and Labour inspectors reported last week that the algae was present in Lake Fanning and Parr Lake, Yarmouth County, and in Porcupine Lake, Digby County. Department inspectors confirm it is no longer detected in Lake Fanning but, under certain conditions, the algae could grow in any fresh water.
Department of Environment and Labour specialists and medical officials recommend that surface water never be used for drinking without proper filtration and disinfection.
"Drinking water which contains cyanobacteria may cause stomach ache, diarrhea, vomiting and nausea," said Dr. Richard Gould, medical officer of health. "Direct contact can cause skin irritation, nose irritation, throat and eye irritation. The health risk is fairly low, but if symptoms persist after a few days, you should consult a physician."
The algae thrives on nutrients. Algae blooms may be triggered by increased nutrient levels, certain water temperature, water flow conditions, or a combination of those factors. Although nutrients occur naturally, sources such as household fertilizers, agricultural run-off, effluent from waste-management systems, faulty septic systems, and others can contribute to nutrient levels.
"People should not use water suspected of containing cyanobacteria to prepare or cook food. It's important to remember that boiling the water will not eliminate the toxins," said Dr. Gould.
Animals can also be affected.
For more information, visit the Department of Environment and Labour website at www.gov.ns.ca/enla/water .