Diversity investigation and assessment of zooplankton from Huanghua Harbour in 2008 summer

We carried out an investigation of the zooplankton from Huanghua Harbour of Hebei province in summer of 2008. The samples were collected by medium plankton net. 24 species were found: 2 Protozoa, 11 Copepods, 2 Opossum shrimp, 1 Acetes, 1 gammarid, 2 Acanthomysis, 1 Chaetognaths, 1 tunicate, 2 larvae and 1 medusa. The average biomass of zooplankton is 320.6 mgm-3, ranging from 75.2 to 1 310.6 mgm-3. The diversity index of zooplankton in coastal waters is significantly higher than that in offshore; the dominant species are Sagitta crassa(0.33), Paracalanus parvus(0.31), Acartia pacifica(0.12), Calanus sinicus(0.38), Labidocera euchaeta(0.34) and Tortanus Spinicaudatus(0.04).