Causes of Red Tide
Red tide is the result of a massive production of tiny, single celled algae called K. brevis. This form of algae is usually found in warm saltwater, but can exist in lower temperatures. It is a natural phenomenon, and is said to be unrelated to pollution caused by man. In high concentrations, K. brevis may create a brownish red color on the surface of the water.
No one can predict when or where red tide will appear or how long they will last since they are affected by different variables such as weather and currents.