PIT-Tag Effects on Hatchery Salmonids: Carson National Fish Hatchery Spring Chinook Salmon

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PIT-Tag Effects on Hatchery Salmonids: Carson National Fish Hatchery Spring Chinook Salmon

Coded-wire-tags (CWT) and passive integrated transponder (PIT) tags are used extensively throughout the Columbia River Basin to address a wide variety of management and research questions. A recent study by Knudsen et al. (2009) found that dual-tagged (CWT and PIT-tagged) hatchery spring Chinook salmon smolts released in the Yakima River had lower smolt-to-adult return rates (SARs) compared to CWT smolts, indicating that PIT-tags may impart a survival bias relative to smolts tagged with CWTs. Given the widespread use of CWT and PIT-tags, further evaluations of potential tag effects would be informative for quantifying the level of bias, if present, associated with each of these two tag types. Towards this end, we initiated the PIT-Tag Effects Study (PTES) at Carson National Fish Hatchery (NFH) with the marking of the brood year 2009 release. The objectives are 1) to determine the effects of PIT-tags on spring Chinook salmon SARs and 2) to determine PIT-tag loss rates throughout the complete salmon life-cycle.

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Author(s)
William Brignon
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Type of document
Annual Report
Facility
Coho Salmon eggs incubating and hatching at Quilcene NFH in WA State.
Columbia River Fish and Wildlife Conservation Office
The Columbia River Fish and Wildlife Conservation Office collaborates with local, state and Tribal partners to conserve, restore, and improve native fish and aquatic resources throughout Oregon and along the Columbia River. We study wild and hatchery aquatic organisms and their populations, support...
Conservation Office
Vancouver,WA
Adult Chinook Salmon swimming in McAllister Springs in WA State
Carson National Fish Hatchery
Welcome to Carson National Fish Hatchery! Constructed in 1938 by the Civilian Conservation Corp, we raise and release 1.52 million spring Chinook salmon each year to mitigate fishery losses due to hydroelectric dams on the Columbia River. Furthermore, we belong to a Complex of hatcheries along the...
National Fish Hatchery
Carson,WA
Program
Juvenile Northern Pike in aquarium at Gavins Point National Fish Hatchery, South Dakota
The Fish and Aquatic Conservation program leads aquatic conservation efforts for the U.S. Fish and Wildlife Service. We are committed to tackling the nation’s highest priority aquatic conservation and recreational challenges to conserve, restore, and enhance fisheries for future generations.
Program
Falls Church,VA
Species
FWS and DOI Region(s)
Pacific