Efficiency of Portable Antennas for Detecting Passive Integrated Transponder Tags in Stream-Dwelling Salmonids

• Published in: PloS one 2016-02, Vol.11 (2), p.e0149898-e0149898
• Main Authors: Banish, Nolan P, Burdick, Summer M, Moyer, Katherine R
• Format: Article
• Language: English
• Subjects: Animal Identification Systems - instrumentation; Animals; Antennas; Appendages (Animal anatomy); Behavior, Animal - physiology; Biology and Life Sciences; Confidence intervals; Conservation of Natural Resources - methods; Cottus cognatus; Creeks & streams; Ecology and Environmental Sciences; Efficiency; Engineering and Technology; Fish; Fisheries; Fishing; Geology; Logistic Models; Medicine and Health Sciences; Models, Theoretical; Oncorhynchus mykiss; Oncorhynchus mykiss - physiology; Oncorhynchus mykiss gairdnerii; Physical Sciences; Physiological aspects; Portability; Rivers; Salmo trutta; Salmon; Salmonidae; Salmonids; Species; Statistical analysis; Studies; Tags; Trout; Trout - physiology
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0149898

Portable antennas have become an increasingly common technique for tracking fish marked with passive integrated transponder (PIT) tags. We used logistic regression to evaluate how species, fish length, and physical habitat characteristics influence portable antenna detection efficiency in stream-dwelling brown trout (Salmo trutta), bull trout (Salvelinus confluentus), and redband trout (Oncorhynchus mykiss newberrii) marked with 12-mm PIT tags. We redetected 56% (20/36) of brown trout, 34% (68/202) of bull trout, and 33% (20/61) of redband trout after a recovery period of 21 to 46 hours. Models indicate support for length and species and minor support for percent boulder, large woody debris, and percent cobble as parameters important for describing variation in detection efficiency, although 95% confidence intervals for estimates were large. The odds of detecting brown trout (1.5 ± 2.2 [mean ± SE]) are approximately four times as high as bull trout (0.4 ± 1.6) or redband trout (0.3 ± 1.8) and species-specific differences may be related to length. Our reported detection efficiency for brown trout falls within the range of other studies, but is the first reported for bull trout and redband trout. Portable antennas may be a relatively unbiased way of redetecting varying sizes of all three salmonid species.