Fig. 5

Detections per tag type. a Median number of detections for 22 individual double-tagged steelhead (Oncorhynchus mykiss) on the Discovery Islands array that arrived before day 42 post tag activation (when 50% of 180-kHz tags were predicted to have expired). The central lines show medians, boxes show the inter-quartile range (central 50% of data points), whiskers bracket 1.5 times the interquartile range, and closed circles identify outliers. b The same data subdivided into count categories. Zero and single detections of 180-kHz tags are known because of the presence of the 69-kHz tag. Single detections are often excluded in telemetry studies and would increase the fraction of undetected 180-kHz tags