Distribution characteristics of zooplankton biomass in the East China Sea

Based on 4 cruises seasonal data of comprehensive oceanographic investigation during October.1997 to March 2000 in the East China Sea(23°30'～33°00'N,118°30'～128°00'E) the research was focused on analyzing and approached dynamic of quantitative temporal and spatial distribution of total biomass of zooplankton and the relationship of fishing grounds of anchovy(Engraulis japoicus).The study results show the seasonal mean value of total biomass of zooplankton(65.32 mg/m³) only.Among them total biomass in autumn(86.18 mg/m³) is greater than in summer(69.18 mg/m³) greater than in spring(55.67 mg/m³) greater than in winter(50.33 mg/m³);average value of diet biomass of zooplankton is 40.9 mg/m³ which is about 60% of total biomass of zooplankton.Among them,total biomass in autumn(56.84 mg/m³) is greater than in summer(46.10 mg/m³) greater than in winter (30.82 mg/m³) greater than in spring(29.82 mg/m³).Total biomass distribution trends toward to similar with diet biomass.Distribution scale of high biomass(200~500 mg/m³) is minimum,which is only about 1%~4% of the whole surveying area.Seasonal variation of biomass in the coastal water of the East China Sea is obviously(west of 125°E,norther n part of 29°N).The distributio n of diet zooplankton biomass depends on distribution of abundance of crustacean.The diet zooplankton biomass is related to the center fishing ground of Anchovy(Engraulis japonicus) and its larvae and young fish.In spring,the center fishing ground of Engranlis japonicus(>100 kg/h) and its high concentration area are located at high concentration area of the highest zone of zooplankton of south region and central region.