 Because this ascidian broods its embryos and the larvae are free-swimming for only a brief time, natural dispersal of "D. vexillum" is limited in extent.Dispersal to new habitats in far flung parts of the world is likely to be through its accidental conveyance on the hulls of boats or other floating structures, or its introduction to aquaculture installations, perhaps with commercial oyster spat, seed mussels or aquaculture equipment.Like other colonial ascidians, "Didemnum vexillum" is a suspension feeder.