Abstract:Phaeocystis globosa scherffel has a polymorphic life cycle alternating between free-living cells and colonies. Phaeocystis usually lacks the abilities to form the colonies under lab-controlled conditions. In this work, we investigated the effects of air bubbling and turbulence on the growth and colony-forming of P. globosa. Both air bubbling and turbulence favored P. globosa to form more colonies. However, only turbulence greatly enhanced the colony size and colonial cell numbers, whereas air bubbling did not exhibit significant impacts. Nonetheless, the colonies developed in the lab still had lower diameters than the natural ones.