Abstract
AbstractWe present a new, low‐cost, low‐power, half/full‐duplex passive integrated transponder (PIT) tag interrogation antenna for use in detecting fish movements in small streams. New technology by Allflex‐USA allowed us to develop a reading system with an antenna 279.4 cm wide × 60.9 cm high that reads both common tag types used in fisheries today for about US$1,000. An instream antenna of this size and price makes high‐resolution tracking of fish movement in small streams feasible where cost and tag‐type restrictions were prohibitive. For evaluation, we placed the antenna upstream of a small estuary on the central California coast to observe the diel movements of juvenile steelhead Oncorhynchus mykiss between the estuary and upstream habitats in both spring and fall months.
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