Very high cell densities of Cylindrospermopsis raciborskii were detected in low salinity prawn ponds for Litopenaeus vannamei in Pearl River Delta areas,Guangdong Province,South China from 2002 to 2003.More than 20 prawn ponds were surveyed,and the density of C.raciborskii reached to 7.74×107 filaments·L-1,with an average dominance of 47%.The water temperature in the prawn ponds was 30.3℃;pH is 8.6;salinity was 1.4‰; transparency was 19 cm and the chemical oxygen demand(COD) was 24.3 mg·L-1.It is obvious that C.raciborskii bloom occurs in the environmental condition of high water temperature,high value ofpH,high level of COD and low salinity;moreover,stirring the water in the ponds facilitates the forming of C.raciborskii bloom.In general,the bloom occurs in the middle or late term of water eutrophication in the prawn ponds. C.raciborskii cells can restrain the growth of other algae and microbes in the prawn ponds;some other algal species such as Dactylococcopsis acicularis and Cyclotella sp.can dominate with C.raciborskii.The spiral C.raciborskii is the dominant algal species in the low salinity prawn ponds in Pearl River Delta area,South China.
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