Florida Red Tide (IMAGE) NASA/Goddard Space Flight Center Caption These MODIS satellite images show the Karina brevis (red tide) in shallow (less than 50 meters or 164 feet) regions of the west Florida shelf. The colors of dark green, yellow, and red show high concentrations of algae. The second date on each image indicates the water sample collection time by the Florida Fish and Wildlife Commission (FWC). Letters represent different red tide concentrations as follows: N –below detection limit; P – present; L – low; M – medium; H – high; V – very high. Credit USF/NASA/FWC Usage Restrictions None License Licensed content 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.