Periodic testing of water samples and clams provides an early warning of bloom occurrences and shellfish toxicity and minimizes the risk of human exposure to saxitoxins.
Effects of the toxin producer known as golden algae have been localized within the state to small ponds and the Intracoastal Waterway.
A bloom of Aureoumbra lagunensis that began in July 2012 discolored water in the northern Indian River Lagoon.
Discolored water and fish kills occurred along the Collier County coast in July 2011. Investigations revealed blooms of the nontoxic dinoflagellate Takayama tuberculata. An isolated bloom appeared in Lee County with no negative effects reported.
Samples of discolored water and "froth" reported in February 2011 along Okaloosa and Walton county coastlines revealed a bloom of the nontoxic dinoflagellate but no adverse effects.
Peridinium quinquecorne is a nontoxic dinoflagellate that bloomed alongshore of southwest Florida in 2010.
Fish kills associated with a bloom of the marine microalgae Pyrodinium bahamense occurred in Old Tampa Bay in late July 2008.
In September of 2007 through January of 2008, a Karenia brevis
bloom occurred on the northeast coast of Florida, but it was not the first time.
Based on results of analyses conducted since mid-January 2006, FWC/FWRI researchers have attributed the aquatic animal mortalities in Choctawhatchee Bay to post-bloom brevetoxin exposure.
In 2005, a Florida red tide became trapped in bottom waters causing widespread deaths of benthic, or bottom-dwelling, organisms.
In early 2002, a dark water event, also called "black water" by the media, occurred off the coast of southwest Florida. Samples of the water, which was described as dark brown-black-green, showed a dominance of large, centric diatoms.
A dolphin mortality event was initially reported from St. Joseph Bay in northwest Florida in March 2004. By the end of April, dolphin mortalities totaled 107. Dolphin tissues contained elevated brevetoxin levels and trace amounts of domoic acid.