Sea biopharmaceutical survey

The Institute for Environmental Science has comprehensively evaluated the water environment based on the water quality and biota of rivers and seas in the city, and in order to raise the interest of citizens, in 1973 (Showa 48). Every three years, we investigate creatures that live in rivers and the sea.
In the sea area, the 15th survey was conducted in FY2020 and FY2021 (Reiwa 2nd and 3rd year).
Since the start of the survey, the majority of fish caught in the small bottom seine nets in the inner bay have been tended to be muddy, such as Hatatate Numeri, Tenjikudai, Komochi Jaco, Shiroguchi (Ishimochi), and Makogaray. However, in recent years, Hatatate Numeri, Komochi Jaco and Makogaray have decreased. On the other hand, in this survey, many plankton-eating horse mackerel and Konoshiro, whose spring survey overlapped with the spawning season, were captured.
In this survey, three species of fish, spider, Igodakahodeli, and Kutsuwa goby, were first identified, all of which were rare in Tokyo Bay, where the open sea is the main distribution area. In addition to fish, several organisms have seen a phenomenon in which the distribution area expands toward the inner part of the bay.

We investigate fish, coastal animals, benthic animals, seagrass and seaweeds, planktons, and environmental factors (water quality and bottom sediment), and evaluate water quality based on biological indicators.
In fiscal 2021, the survey was conducted twice in spring and summer.