Algal blooms commonly occur during calm, hot weather in areas of lakes and reservoirs with shallow, slow moving or still water that has sufficient nutrients. The blooms can last up to three weeks and can be pushed around the lake or reservoir by the wind. Direct contact or unintended consumption of algae-contaminated water can cause red skin, sore throat, cramps, nausea, vomiting and diarrhea. If you have any concerns, consult with your health care provider. Caution should be taken when considering the consumption of fish or shellfish caught in areas of a water body where a bloom exists; the internal organs of the fish should not be eaten.