A primary investigating and study on plankton and zoobenthos in Qilihai waters

A survey was conducted to investigate the plankton and zoobenthos of Qilihai offshore in May 2011.The results showed that there were 2 phyum,9 genera,and 13 species of phytoplankton.The average cell abundance of phytoplankton was 808 cells/L,ranging from 773 to 843 cells/L,the dominant species was Pleumsigma belonged to Bacillariophyta.Among zooplankton,four species of the zooplankton belonged to 3 genus were identified.The average abundance of zooplankton was 6.2 cells/L,ranging from 5.0 to 7.4 cells/L,the dominant species were Ookopleura spp and Sagitta crassa.A total of 6 taxa belonging to 3 genera of benthos in the study waters were identified and the dominant species were Aglaophamus sinensis and Goniada japonica.The average biomass of benthos is 2.638 g/L,ranging from 1.405 to 3.650 g/L.Concents of chlorophyll-a is 0.005 6 mg/L in this sea area.Take all into consideration,this sea area is polluted in some extent,it is extremely urgent that we shoud take necessary measures to recover the entironment.