👉 Cyanose is a biological process that occurs in certain species of algae, particularly those belonging to the genus Cyanobacteria. This process refers to the reduction of the oxygen levels in the water column due to the presence of dissolved organic matter, which can lead to anoxic conditions. In aquatic environments, cyanose causes a rapid decline in oxygen levels, leading to hypoxia and toxic effects on marine life. It is a critical factor that affects the growth and survival of many species of algae,