Health Unit confirms Blue-Green Algae Bloom at Weismiller Bay on Lake Muskoka

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Muskoka Post Staff

Residents and visitors to Weismiller Bay on Lake Muskoka, in the Township of Muskoka Lakes are being cautioned about a small confirmed blue-green algae bloom.

The Simcoe Muskoka District Health Unit is asking resident and visitors to exercise caution where blue-green algae is visible and to take the following precautions:

* Do not use the lake water for the preparation of infant formula

* Do not allow pets or livestock to drink or swim in the water where an algae bloom is visible

* Be cautious about eating fish caught in water where blue-green algae blooms occur

*Do not use herbicides, copper sulphate or other algaecides that may break open algae cells and release toxins into the water.

Swimming and other water sport activities should also be avoided in areas where algae is visible. Blooms may make the water look bluish-green, or like green pea soup or turquoise paint. Many species of blue-green algae (also called cyanobacteria) have the potential to produce toxins that are harmful to the health of humans and animals. The Ministry of Environment, Conservation and Parks will be further analyzing samples to determine the presence of any toxins.

Symptoms from consuming toxins from a blue-green algae bloom can include headaches, fever, diarrhea, abdominal pain, nausea and vomiting, and can be more serious if water is swallowed in large quantities. The health unit and the Ministry of Environment, Conservation and Parks will continue to work together to monitor the algal bloom and updates will be provided on our website ( as we receive new information.

To learn more about blue-green algae visit the health unit website at, or call Health Connection weekdays from 8:30 a.m. to 4:30 p.m. at 705-721-7520 or 1-877-721-7520.

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