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Comparative Performance of Sham Radio-Tagged and PIT-Tagged Juvenile Salmon

机译:假无线电标记和pIT标记少年鲑鱼的比较表现

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Various fish marking methods are being used to estimate juvenile salmon survival in the Columbia River Basin, including PIT tags (passive integrated transponder tags) and balloon tags. In some locations, methods are limited because of lack of sampling and detection capabilities downstream or availability of adequate numbers of fish. In these situations, radiotelemetry has been proposed because high detection rates allow the use of smaller sample sizes, and because radiotelemetry monitors are easily deployed. To ensure that the presence of the radio transmitter and antenna do not compromise the performance of smolts, and thus do not provide biased estimates of survival, the National Marine Fisheries Service and the U.S. Geological Survey compared migration rates, detection probabilities, and survival of hatchery yearling chinook salmon (O. tshawytscha) tagged with either gastrically or surgically implanted sham radio tags to those of their cohorts tagged only with PIT-tags.

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