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- Press Release FY2021
- The number of exotic species increases in the clean river! ~ The 15th City River Biological Survey Results Report ~
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The number of exotic species increases in the clean river! ~ The 15th City River Biological Survey Results Report ~
Last Updated April 28, 2021
Press release materials
April 28, 2021
Environmental Planning Bureau Institute of Environmental Science
Hideo Momose
Phone number: 045-453-2550
Fax: 045-453-2560
Yokohama City conducted a survey on fish, benthic animals, aquatic plants, and attached algae about once every three years from 1973 for six rivers flowing through the city. We evaluate the water quality of rivers. This is the 15th survey. Compared to past survey results, the number of species confirmed has increased as the water quality of rivers has improved, but on the other hand, the number of species of alien species that appear has been increasing year by year.
Press release materials
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Page ID: 341-606-212
