抄録
Biological indicatior system etc. of eutrophic level according to phytoplankton was applied as classification of several marine regions (Dokai Bay and Hibiki Nada, Osaka Bay, Suho Nada, and Miho Bay). Plankton samples collected in the stratification period were used in the present examination. The degree of eutrophication in these regions was judged by usiug a list of phytoplankton as eutrophic level indicator as clarified in the previous paper, and considering three more spplementary characteristics, vis., the total number of cells in the phytoplankton, the coloration of marine water, and transparency.
Dokai Bay and the inner part of Osaka Bay discharged by a large quantity of domestic and industrial waste water were classified as the extremely eutrophic regions, Miho Bay where oceanic water and smaller quantity of waste water flowed was classified as the region berween oligotrophic and eutrophic and eutrophic ones.
These results showed good agreement with those of classification of the eutrophic levels according to physico-chmical indicators of water.
