Precision and interpretation of data collected using a new measurement technique for microhabitat features at fish locations determined by radio telemetry

We developed a microhabitat sampling methodology for investigating fish hab itat use by radio telemetry. The technique is based on the concept of an ar ea of probable occurrence (APO; a circular confidence interval around an es timated fish location) with measurements of depth, velocity, substrate, and cover features to describe the habitat in the vicinity of a fish's locatio n. We conducted a test of precision and observer agreement of data obtained by this technique and found that the statistical precision of data varied among habitat variables and was low for features that were visually estimat ed. However, when data were interpreted within the context of several biolo gically relevant research questions, observer agreement was high indicating that the data led to consistent conclusions regarding microhabitat feature s within an APO.