Four comprehensive surveys with different depths and subjects were performed byState Oceanic Administration (SOA), China in the centre of the South China Sea(12°-19°30′N, 111°-118°E) from September 1983 to January 1985. According to the data,the vertical distribution pattern of the total biomass and species of zooplankton down to a4000 m depth was for the first time reported and analysed, and the vertical composition ofpopulation was studied.
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