Figure 2 . (A) Correlation plot showing deviation from 1:1 agreement between counts in water (standardised method) and counts in air (simulating the regular ‘farmer’ method). The blue line (linear fit) having a lesser slope than the dashed green line (1:1 agreement) indicates that counts in air tend to result in fewer detections than counts in water. Each point represents an individual fish. Overlapping points are indicated by opacity (more opaque = more overlapping points). (B) Marginal predictions from Model 1 showing estimated louse densities according to louse class and counting method (standardised in-water count or farmer in-air count). The model was fitted to counts from two sampling occasions (Samples 2 and 4), while the plotted predictions are conditional on louse levels at Sample 2.
