Abstract: In this paper,the ecological characteristics of zooplankton in feeding grounds of mackerel and scads from Southern Yellow Sea and East China Sea were studied by comparing methods. It showed that the extreme difference and variation coefficient of zooplankton biomass in southern foeding ground were less than those in northern feeding ground. The average value was higher in southern than in northern feeding ground,if the influence of biomass in a few stations could be negleoted. In northern feeding ground,community indices as diversity,homogeneity,abundance and simplicity were higher,and in southern feeding ground,they are to the contrary. The number of dominant species of zooplankton was less in northern than in southern feeding ground,but most of dominant species had higher aggregated intensity. On the contrary,the dominant degree in southern feeding ground was lower,and association density was also lower.

Key words: Zooplankton, Biomass, Community indices, Dominant species, East China Sea, Yellow Sea