Peer-reviewed papers from the Fifth International Conference on Marine Bioinvasions, held at the Massachusetts Institute of Technology, May 21-24, 2007. The papers contained in this volume are a peer-reviewed selection from among those presented at the meeting and represent a range of topics, while also providing state-of-the-art insight into our current understanding of the ecological, economic, and evolutionary impacts of marine bioinvaders. J.A. Pederson & A.M.H. Blakeslee; Fifth international conference on marine bioinvasions -- J.E. Lawrence. Furtive foes: algal viruses as potential invaders -- Extended abstract J.E. Byers & J.M. Pringle. Going against the flow: how marine invasions spread and persist in the face of advection -- S. Behrens Yamada & G.E. Gillespie. Will the European green crab (Carcinus maenas) persist in the Pacific Northwest? -- A.C. Mathieson, J.R. Pederson, C.D. Neefus, C.J. Dawes, & T.L. Bray .Multiple assessments of introduced seaweeds in the Northwest Atlantic -- D.A. Reusser & H. Lee II .Predictions for an invaded world: a strategy to predict the distribution of native and non-indigenous species at multiple scales -- M.C. Tyrrell, M. Dionne, & J.A. Edgerly. Physical factors mediate effects of grazing by a non-indigenous snail species on saltmarsh cordgrass (Spartina alterniflora) in New England marshes -- J.R. Cordell, S.M. Bollens, R. Draheim, & M. Sytsma. Asian copepods on the move: recent invasions in the Columbia-Snake River system, USA -- J.L. Martin & M.M. LeGresley. New phytoplankton species in the Bay of Fundy since 1995 -- L.A. Auker & C.A. Oviatt. Factors influencing the recruitment and abundance of Didemnum in Narragansett Bay, Rhode Island -- M.M. LeGresley, J.L. Martin, P. McCurdy, B. Thorpe, & B.D. Chang. Non-indigenous tunicate species in the Bay of Fundy, eastern Canada -- P.A.L.D. Nunes & A. Markandya. Economic value of damage caused by marine bio-invasions: lessons from two European case studies -- T.W. Therriault & L-M. Herborg A qualitative biological risk assessment for vase tunicate Ciona intestinalis in Canadian waters: using expert knowledge -- T.W. Therriault & L-M. Herborg. Predicting the potential distribution of the vase tunicate Ciona intestinalis in Canadian waters: informing a risk assessment -- M.L. Campbell. Organism impact assessment: risk analysis for post-incursion management -- C.M. Denny Development of a method to reduce the spread of the ascidian Didemnum vexillum with aquaculture transfers -- G.A. Hopkins & B.M. Forrest. Management options for vessel hull fouling: an overview of risks posed by in-water cleaning -- List of referees.