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Sea Environment in Yokohama
Last update date April 5, 2021
Water quality change at Yokohama Port
Before the high economic growth, coastal fisheries and seaweed cultivation were active, and the scenery of seaweed Inui was seen in various places.
Subsequently, during the period of rapid economic growth, the close relationship between the sea and rivers and people's lives was lost, and at the same time, water quality deteriorated due to the inflow of domestic wastewater and industrial wastewater.
The water quality of Yokohama Port has improved significantly due to the development of public sewers and regulations on factory wastewater, but in recent years it has been flat, and issues such as red tides, an aerobic sea area, and odor generation are still left.
Enriching Seas Business
Together with citizens, companies, and local governments in the Tokyo Bay basin, we are promoting the creation of the future sea of Yokohama, which is loved and loved by everyone, with citizens, companies, and local governments in the Tokyo Bay basin. doing.
Initiatives for Enriching Seas
About the red tide
The red tide is a phenomenon in which seawater is discolored due to abnormal growth of plankton. When the ocean is polluted and nutrients such as phosphorus and nitrogen are increased in the sea, plankton increases abnormally due to temperature and other effects. Seawater may discolor reddish brown or orange, and sometimes blue-green due to the growth of plankton. Such plankton is called red tide plankton.
For inquiries to this page
Environmental Conservation Department, Green Environment Bureau
Phone: 045-453-2550
Phone: 045-453-2550
Fax: 045-453-2560
Email address: mk-kanken@city.yokohama.lg.jp
Page ID: 323-267-429
