Abstract: Based on the investigation of oceanographic environment of Lüsi fishery (31.90°N-32.10°N, 121.70°E-121.95°E) in June 2008, this paper studied the species distribution pattern, dominant species, quantitative distribution, diversity, and other ecological parameters of diet zooplanktons in the fishing ground. A total of 31 diet zooplankton species (excluding planktonic larva and coelenterate) were observed, and planktonic copepods were dominant both in species number and in abundance. The total biomass of the zooplankton was averagely 845.54 mg·m^-3, with 895.58 mg·m^-3during spring tide and 795.49 mg·m^-3during neap tide. During spring tide, the biomass was higher in the north than in the south; while during neap tide, the biomass was the highest in the middle of the ground. In June, the dominant species were Labidocera euchaeta, Calanus sinicus, Paracalanus parvus, Acartia pacifica, Schmackeria poplesia, Peraclis reticulata, and Acanthomysis longirostris. During spring tide, both L. euchaeta and C. sinicus had the highest dominance of 0.19; during neap tide, the highest dominance of L. euchaetawas 0.40. In short, the biomass of the diet zooplanktons in Lüsi fishing ground was very rich, and the zooplanktoic community was composed of many dominant species, suggesting that the community structure of the diet organisms was stable, being able to provide a fine diet surrounding for the growth of juvenile small yellow croaker.

Key words: Phytoremediation, Soil, Organic pollutants