セクションアウトライン

    • A phenomenon in which phytoplankton in seawater proliferate abnormally, causing the sea to appear to change color

      • Diatoms, raphidophytes, and dinoflagellates are representative groups

      • Different types of plankton produce different colors, such as reddish-brown and dark brown

    • Reported frequently in inner bays of western Japan, such as the Seto Inland Sea and Ariake Sea

    • Red tides increased dramatically during the period of rapid economic growth due to the discharge of nutrients (nitrogen and phosphorus) and organic matter
      • The number of outbreaks has been decreasing due to stricter effluent standards

    • Causing damage to fisheries

      • Fish become unable to breathe due to gill damage
      • Oxygen is consumed to break down the plankton, resulting in oxygen deprivation
      • Toxins produced by the plankton act

    • This red tide was observed in the open sea, not in closed sea areas, and has never been reported in Japan, has it?