Red Tide Bloom (image) North Carolina State University Caption A red tide bloom off the coast of Florida. Blooms of Karenia brevis algae become more toxic when access to phosphorus is limited. Credit Photo courtesy of the Florida Fish and Wildlife Research Institute. Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.