The algae usually produce a visible bluegreen sheen, which appears as surface scum.
The Capital Regional District advises that water samples taken from Eagle Beach at Elk Lake have tested positive for a type of blue-green algae that can produce dangerous toxins.
Visitors are advised to avoid swimming at Elk Lake and to keep animals on a leash to prevent them from drinking or swimming in the lake until the advisory has been lifted. There currently are no signs of toxic blue-green algae at Beaver Lake.
The algae usually produce a visible blue-green sheen, which appears as surface scum.
These algae are known toxin producers and these compounds have been detected previously at the park.