What kind of bloom occur.
Various kinds of nutrients effective for growth of red tide causative phytoplankton tend to increase in coastal areas and inner bays through inflow of river water containing domestic waste or industrial discharged water and also through elution of the nutrient from bottom sediment containing much amount of organic substances. If environmental conditions, such as water temperature, salinity and day time length, become optimum, phytoplankton growth accelerates considerably. Furthermore, if grazing zooplankton in a certain enclosed area, water color often changes usually due to pigments of the phytoplankton and then people call discolored water as a red tide.
Schematic diagram of red tide occurrence mechanism
-Revised from Japan Fisheries Resource Conservation Association-
（Please click a figure to get larger）
