This protocol gives a method for isolating temperate phages from marine viral concentrations.\u00a0This protocol uses the conventional plaque agar overlay and looking for turbid or haloed plaques, a hallmark of temperate phages.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.Please see the full chapter for additional details.