A "red tide" is a phenomenon caused by the rapid growth of certain types of algae in the ocean, often resulting in a discoloration of the water. These algae, known as phytoplankton, can produce toxins that are harmful to marine life and humans. Red tides can occur in both coastal and open ocean waters, and their occurrence is influenced by factors such as nutrient availability, water temperature, and salinity. While the term "red tide" suggests a red color, the water can also appear green, brown, or yellow, depending on the species of algae involved. Some harmful algal blooms can lead to fish kills and affect the health of marine ecosystems. Additionally, consuming contaminated shellfish can pose health risks to humans, making monitoring and management of red tides important for public safety.