SLICE treatments of farmed salmon in the Broughton Archipelago, British Columbia, Canada from November 1999 to December 2009 (Marty et al. 2010 PNAS). A treatment on a farm is indicated by a red circle at the farm location. Untreated farms are shown by green circles, and farms fade from red to green over the four month efficacy period of SLICE treatments (see main text). Fallowed farms (i.e., no salmon in net pens) are indicated by beige circles with an 'x'. Data that were used in the analysis of louse population dynamics before and after treatments (see main text) are circled in thick black. The period of juvenile wild salmon outmigration is indicated by purple arrows along approximate migration routes.