"Red Tides" is a comprehensive technical book that addresses the global phenomenon of red tide, which is increasingly perceived as a marine threat. It particularly focuses on the massive fish and shellfish die-offs caused by poisoning. The book highlights the history of red tide in the Seto Inland Sea, the largest semi-enclosed sea in Japan, which has been affected by these outbreaks since the late 1950s. It provides a detailed analysis of biological research findings on the taxonomy of cysts and vegetative cells of the organisms responsible for red tide. Additionally, it presents ecological and physiological studies conducted using ecological modeling. This book is a valuable resource for scientists and students in the fields of biological oceanography, marine environmental sciences, and aquaculture, as well as for government researchers involved in the protection of the marine coastal environment.