PARKS Victoria has warned people not to swim in Lake Charlegrark after blue-green algae was detected.
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Warning signs have been installed at the lake, and Parks has urged people to avoid direct contact with the water.
The algae bloom comes just a week after the Lake Charlegrark Country Music Marathon, which attracted hundreds of people to the area.
Parks Victoria has advised that any fish caught in the lake should have their gills and guts removed prior to cooking.
They said direct contact with blue-green algae could cause allergic reactions such as skin rashes and itchiness, sore eyes, ears and nose.
They advised anyone who comes into contact with the water to wash their skin immediately in fresh water.
Staff have also warned irrigators to take extra care to avoid spray drift, the pooling of water, or inhaling mist from blue-green algae-affected water.
Parks staff will monitor the conditions and remove signs once the lake is safe for use.