River area biopharmaceutical survey

The Institute for Environmental Science evaluates the comprehensive water environment, including the water quality of the waters in the city's waters, and shows changes in the biota, so that citizens can raise their interest in rivers and the sea. For the purpose, almost every three years since 1973, we have been investigating creatures that live in rivers and the sea in the city.
In the river area, the 15th survey was conducted in FY2018 and FY2019.
Over the past 40 years, some creatures have returned to the river in Yokohama, even though they disappeared once, due to improvements in water quality due to the spread of sewerage and improvement of the river environment by installing fishways. While the types of fish, shrimp, and crabs that come and go through rivers and the sea are increasing, the number of alien species is also increasing, so it is necessary to pay attention to future trends.

We investigate fish, benthic animals, aquatic plants, adhering algae, and water quality, and evaluate river water quality from living creatures.
In recent years, we have been conducting surveys at each location once in summer and winter.