This protocol gives two methods for prophage induction in heterotrophic bacterioplankton; one with no viral reduction and the other with viral reduction (see guidelines).Paul, J. H., and M. Weinbauer. 2010. Detection of lysogeny in marine environments, p. 30\u201333. In S. W. Wilhelm, M. G. Weinbauer, and C. A. Suttle [eds.], Manual of Aquatic Viral Ecology. ASLO.