Why is the term red tide a misnomer?

The term "red tide" is a misnomer because it suggests a harmful algal bloom is always associated with a red coloration, which is not accurate. These blooms can appear in various colors, including green, brown, or even clear, depending on the species of algae and environmental conditions. Moreover, the phenomenon can occur in freshwater as well as marine environments, further complicating the terminology. Thus, "red tide" inaccurately generalizes a complex and diverse ecological event.