The city of Naples and Collier County are experiencing a bloom of Trichodesmium algae along the coastline. City staff received reports on Sunday from Seagate Beach and offshore along Gordon Pass and Keewaydin Island. The bloom can appear brown, green and reddish pink in color. It is commonly called sea sawdust and has a smell like rotting hay, and is commonly mistaken for an oil or sewage spill. It typically blooms offshore and hits Collier beaches almost every year in May and June. Occasionally wind, and currents bring it to the beaches and even into some back bays. Researchers haven’t documented any negative effects of Trichodesmium on marine life or people in Florida, city officials said, but the Florida Department of Health does not recommend swimming in algae blooms.