The result showed that the average biomass of Oocystis borgei in the early, middle and late period of prawn culture was 98.02 %, 78.89% and 45.12%, respectively of the total microalgae.

• 结果表明：养殖前、中、后期，波吉卵囊藻平均生物量占浮游植物总生物量分别为98．02%25、78．89%25和45．12%25，成为虾池中的绝对优势种；