MADISON, Wis. — The Wisconsin Department of Natural Resources is warning swimmers and boaters to watch out for blue-green algae blooms.

The agency says bloom reports typically spike in August because the water has warmed up and conditions are most conducive for algae growth.

Some algal species produce toxins that can cause a range of ailments, including stomach aches, flue-like symptoms, rashes and hives.

DNR experts say people wade in up to their knees and can't see their feet they should get out of the water. People also should wash off after swimming in any lake or pond and rinse their pets off to prevent them from ingesting any blue-green algae on their fur.