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gvwireState water authorities on Thursday raised the warning level about toxic algae at San Luis Reservoir, saying no one should swim there or eat fish caught in the lake.
The Department of Water Resources boosted the advisory level at the reservoir from warning to danger after detecting increased levels of a toxin called microcytins in blue-green algae.
People looking to enjoy a day at the Merced County reservoir can safely ride atop the water in boats but must avoid any contact with the water, the water resources department said. The alert will remain in place until further notice.
Exposure to toxic blue-green algae, also known as cyanobacteria, can cause eye irritation, allergic skin rash, mouth ulcers, vomiting, diarrhea, and cold- and flu-like symptoms. Pets can be especially susceptible because they tend to drink while in the water and lick their fur afterward.
Algae bloom conditions can change swiftly, with wind or waves shifting the bloom or changing its concentration.
The water resources department recommends that people near a body of water with algae bloom take precautions:
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