Filter-feeding omnivorous fish was the common fish in southern China.In order to evaluate the influence of the fish on zooplankton community,the changes in species composition,abundance of zooplankton community after filter-feeding omnivorous fish stocking were studied in this study.The results showed that after the fish stocking,there was a rapid decrease in abundance of Cladocera(Diaphanosoma dubium and Moina micrura) and Copepoda(Thermocyclops mongolicusand and Tropodiaptomus australis).The density of Rotifera increased one week after stocking,and then high density was maintained.The dominant species of Rotifers were also changed,with Brachionus dominating in the first two weeks and Trichocereidae pusilla,Polyarthra trigla and Anuraeopsis fissa dominating during the rest of the study period.Our study demonstrated that filter-feeding omnivorous fish can impose a significant impact on zooplankton community,and large-sized zooplankton suffered a more significantly negative effect leading to the dominance of small-sized individuals and species in zooplankton community.
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