Abstract: From May to September 2007, a survey was conducted to investigate the species composition, community characteristics, and dominant species of meso a
nd microzooplankton in the macrojellyfish bloom areas of Southern Yellow Sea(121°15′E122°09′E, 31°53′N-32°53′N). Zooplankton net (0.160 mm mesh size) was used to collect the samples from six investigation sites (St.1, St.2, St.3, St.4, St.5, and St.6). A total of 58 species belonging to 11 groups and 5 phyla were identified, among which, Copepod was the most dominant group, consisting of 8086% of the total abundance of zooplankton. The average abundance of the zooplankton was 783.17 ind·m^-3 (ranging 452.23-1241.86 ind·m^-3), with the highest density at St.4, and the mean value of diversity index (H′) was 2.76 (2.44-2.95), being higher at southern part (St.4--St.6) than at northern part (St.1-St.3). Paracalanus parvus was the most dominant species and concentrated at St.4, with the average abundance being 263.76 ind·m^-3 (152.23-451.89 ind·m^-3). The total abundance and gross biomass of the zooplankton in the investigated areas depended on the abundance of P. parvus. There was a significant positive correlation between zooplankton biomass and gross catchper unit effort (CPUE), and a significant negative correlation between macrojellyfish CPUE and gross CPUE, and between macrojellyfish CPUE and Pseudosciaena polyactis CPUE.

Key words: Macrophytes, Constructed wetland, COD, Total Nitrogen, Purification