![]() Immense crater may have been found deep under Greenland's ice sheet.Deep inside Earth, scientists find weird blobs and mountains taller than Mount Everest.Anyone who experiences these symptoms after eating seafood or going near the ocean should seek immediate medical treatment. Swimmers who may inadvertently have been exposed to affected water should rinse off with fresh water, and the same goes for pets that may have been exposed.Ĭommon symptoms of red tide poisoning include breathing problems, tingling sensations, rapid heartbeat and problems with coordination. But beachgoers should be aware that red tides can affect coastal areas in late summer and early fall and they should be vigilant about what they eat and when and where they go to the beach. When a red tide strikes, local authorities often post written warnings at beaches and marinas, and restaurants take off the menu fish and shellfish that could be affected. Similar toxins can be produced by other algal blooms. The algae that cause red tides in Florida produce brevetoxins, which attack the nervous systems of fish, shellfish and birds as well as humans and other mammals. Algal blooms can be worsened by fertilizer runoff from farming and waste from sewage treatment plants, but Frankovich says that doesn’t seem to be the case with red tides in Florida. In addition to warm waters, Frankovich says red tides are fueled by naturally occurring upwellings of nutrient-rich water. “But a lot of times they persist throughout the entire year and make the next year's bloom even larger.” Fish are washed ashore the Sanibel causeway after dying in a red tide on Aug. “They seem to start up in the late summer, then they persist for about four months into late fall, and then they die back,” he says of red tides in Florida. Thomas Frankovich, a Florida International University biologist who studies algal blooms around Key Largo, Florida, says red tides occur when water temperatures are high. But algal blooms can be caused by many different species of algae. In Florida and Texas, red tides are caused by an alga called Karenia brevis. They’re also common along the coast of California and in the Gulf of Maine. In the United States, they are common along the Texas coast, and they occur almost every summer along the Gulf Coast of Florida. Red tides occur in coastal waters all over the world. Spanish explorers heard stories of “red water” from Florida Indians in the 16th century. The earliest reports of red tides are from Japan in the 8th century.
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