Figure 2

(a) box-plot for the mean abundances of adult female L. salmonis on farms, in Muchalat Inlet, limited to the February-May (t-1) window for each study year (2007–2016; n = 140); (b) box-plot for the distribution of the prevalence of infestation with L. salmonis on out-migrating Chum (%) in Muchalat Inlet, during the March–June (t) window for each study year. Prevalence values were estimated for each wild site-year-month instance (n = 365). Each box represents the interquartile range including the median line. Whiskers represent the lowest and highest adjacent values. Small circles represent outliers. *In plot (b), two outliers for lice prevalence have been removed to improve clarity in visualising the distributions. These two values of 100% and 75% occurred with very low sample sizes (3/3 in 2010, and 3/4 in 2016, respectively).