Blue-green algal bloom confirmed in the French River

Samples from a bloom of blue-green algae taken from the French River have been confirmed to be a species of cyanobacteria that can produce toxins. (File)

Samples from a bloom of blue-green algae taken from the French River have been confirmed to be a species of cyanobacteria that can produce toxins.

The sample of the blue-green algae bloom was taken Sept. 16, Public Health Sudbury & Districts said in a news release Monday.

"Blue-green algal blooms could also appear in other parts of the river," the health unit said.

"Because blooms are not anchored, they can move from one location to another through wind and water currents. New blooms can also form. All residents on lakes and rivers should look for blooms in their area."

Blue-green algal blooms have an unsightly pea soup appearance and foul smell and can produce toxins. Residents should avoid using or drinking water from areas where blooms are visible.

The highest concentrations of toxins are usually found in blooms and scum on the shoreline.

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"These dense accumulations pose the greatest potential risks to people and pets," the release said.

"The algae toxins can irritate a person’s skin and, if ingested, cause diarrhea and vomiting. If a person ingests high levels of toxin, they could suffer liver and nervous system damage."

Public Health said it advises people using lakes and rivers to be on the lookout for algal blooms.

For more information on blue-green algae, including a list and map of water bodies with confirmed blooms, visit the health unit's website or call 705-522-9200, ext. 464, or toll-free 1-866-522-9200.