Fig. 3

Detection efficiency estimates and associated 95% confidence intervals for 180-kHz tags relative to 69-kHz tags implanted into steelhead (Oncorhynchus mykiss) smolts. Estimates for the 69-kHz tags were made using all detections. Estimates for the 180-kHz tags were made using all tagged fish that had arrived at the array before day 42 post tag activation (when 50% of 180-kHz tags were predicted to have expired). Corrected estimates (cor.) account for premature tag expiry (see “Methods”). Note that the single-line configurations (subarrays) were designed to function together rather than as independent replicates