SURVEYS ON THE CAUSAL ORGANISMS OF RED TIDE IN DALIAN WAN

13 surveys on causal plankton of red tides were made from April to October 19T9in Dalian iTan. It revealed that the biomass of SkeLetanema castatem (Greville) Clovereached a coxicentration more than10⁴ cells/rnl in 5 surveys, while the hiornass of DactyliosoLera mediterraa Peragallo, Mesodisziwm rurxcm (Lohnzann) and Prorocen-tram micrcas Ehernberg reached more than 103 cells/ml in few surveys and morethan ten. species of common red tide causal organisms were also observed.