Estimating detection probability and detection range of radiotelemetry tags for migrating sockeye salmon (Oncorhynchus nerka) in the Harrison River, British Columbia

Radiotelemetry is a commonly used tool for tracking migration rates, estimating mortality, and revealing fish behaviour. However, researchers risk misinterpreting tag detection data by not appropriately accounting for signal detection probability or detection range of fixed antennas. In this study, I use generalized linear mixed effects models to estimate signal detection probability and detection range of six radiotelemetry tags at four fixed antenna sites. Detection probability differed among the four telemetry fixed sites despite identical techniques and similar receiver site equipment in a relatively small geographic area. The interaction of depth and distance demonstrated the greatest impact on detections at all sites. I conclude that rigorous testing of detection probabilities and detection range of test tags at individual receiver sites should be standard protocol for telemetry studies to optimize study designs and to ensure that appropriate inferences are drawn when telemetry data are used to support management decisions.