FRANCAIS

August 07, 2003

The Office of the Chief Medical Officer of Health, in consultation with Manitoba Conservation, has issued advisories and posted signs at both Sandy Hook and Albert beaches because of severe algae blooms.

At Sandy Hook Beach, tests have shown elevated levels of an algae toxin called microcystin. Manitobans are advised to remain out of the water and to not drink the water until further tests show that toxin levels have dropped and the algae bloom dissipates.

Microcystin test results from the algae bloom are considered safe at Albert Beach, but Manitobans are advised to avoid drinking or swimming in water where severe algae blooms are visible.

Algae blooms can contain toxins which can be harmful to the liver or the nervous system if large amounts of water are ingested. Drinking water containing algae can also cause an upset stomach and diarrhea, and external exposure to algae blooms has been reported to cause skin irritation.

In the absence of algae bloom, recreational use of the water is considered safe. However, Manitobans should take the following precautions if significant algae blooms are noticed in the water:

• Avoid swimming or other contact with the water.
• Do not drink the water--boiling or chlorination will not make the water safe.
• Prevent pets or livestock from drinking the water along the shoreline as this could be fatal to animals.
• Do not eat fish from the lake that appear to be unhealthy.

Algae are a sign of a healthy lake, as they provide food and oxygen for many aquatic life forms. However, too much algae development can cause water quality problems for consumption and recreational purposes when levels reach higher proportions.

When algae become abundant and form floating clumps or scums along shorelines, they are called algae blooms. The water looks like thick pea soup and may emit a strong, unpleasant odour.

Manitobans should be aware that late summer is the most common time of year for algae blooms on Manitoba beaches. Optimum conditions for algae growth include clear and calm water conditions and warmer temperatures.

The last advisory regarding algae blooms occurred at Lake Dauphin in 2001.

People can report severe algae blooms to Health Links at 788-8200 or toll-free at 1-888-315-9257. For more information on algae, visit the Web site at:

http://www.gov.mb.ca/conservation/watres/water-guide/quality/algae.html

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