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Concurrent Sessions A: Passage Effectiveness Monitoring in Small Streams I - Motivation and Movement at Stream-Road Crossings: Observation and Experiments With Fish in the Pacific Northwest

Abstract
We studied fish movements at stream-road crossings restored to the Forest Service stream simulation standard at four locations on the Siuslaw National Forest in 2011 and 2012. Patterns of fish movement at these crossings were tracked using implanted passive integrated transponder tags. Tag locations were recording using arrays of stationary antennas, complemented with periodic tracking with mobile antennas. We found that some fish frequently moved through crossings, as expected with a stream simulation design. With these data, we evaluated the efficacy of individual telemetry as a means of tracking movement responses to crossings. This included an evaluation of the numbers of fish captured in a site versus our ability to track their locations, as well as the motivation of individuals to move. We also conducted an experiment to manipulate the latter, which successfully increased the rates of movements observed through crossings over a period of just a few days.
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2013-06-27
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