The water quality and phytoplankton communities of the coastal waters of Inchon were investigated 4 times from May, 1995 to January, 1996. The characteristic of the study was shallow muddy bottom environment with high SS concentration. The water qualities were belong to the category of I-grade in DO, Ⅱ to Ⅲ grade in COD and Ⅲ-grade in inorganic nutrients such as T-N and T-P. Total 136 species of phytoplankton were observed in this study and species richness was on the decrease compared with the results of previous studies. The mean of phytoplankton species diversities was 1.93, decreased in recent years and the value in autumn was slightly higher than that in other seasons.

• 여환구(한서대학교 환경공학과) | Hwan-Goo Yeo (Dept. of Environmental Engineering, Hanseo Univ.)
• 강헌(수원대학교 환경공학과) | Hun Kang (Dept. of Environmental Engineering, Univ. of Suwon)