Efficiency of portable antennas for detecting passive integrated transponder tags in stream-dwelling salmonids

PLoS ONE
By: , and 

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Abstract

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.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Efficiency of portable antennas for detecting passive integrated transponder tags in stream-dwelling salmonids
Series title PLoS ONE
DOI 10.1371/journal.pone.0149898
Volume 11
Issue 2
Year Published 2016
Language English
Publisher Public Library of Science
Publisher location San Francisco, CA
Contributing office(s) Western Fisheries Research Center
Description e0149898, 10 p.
Country United States
State Oregon
County Klamath County, Lake County
Other Geospatial Boulder Creek, Brownsworth Creek, Klamath River basin, Leonard Creek
Online Only (Y/N) N
Additional Online Files (Y/N) N