Fig. 4

Tag expiry time and time of arrival of double-tagged steelhead (Oncorhynchus mykiss). The red line predicts the proportion of 180-kHz tags that were still transmitting as the fish migrated north, based on the tag failure time distribution (see “Methods”). The dotted lines show the estimated dates at which 95%, 50%, and 5% of the 180-kHz tags were estimated to have remained active, and the kill date (day 54). The numbers on each dotted line are the percentiles of fish arriving at each array by these expiry dates, based on the 69-kHz tag detections. For example, 72% of the fish had arrived at the Discovery Islands array and 43% arrived at the Johnstone Strait array by the median time of 180-kHz tag expiry (day 42)