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Factors influencing spawner success in a spring Chinook salmon (Oncorhynchus tshawytscha) reintroduction program

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https://ir.library.oregonstate.edu/concern/articles/wd375x98t

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Abstract
  • Dams have contributed to the decline of migratory fishes by blocking access to historical habitat. The active transport (trap and haul) of migratory fish species above existing dams can sometimes support population recovery when the use of fish ladders or dam removal is infeasible. However, little is known about the efficacy of trap and haul conservation strategies. Here we used genetic parentage assignments to evaluate the efficacy of reintroducing adult Chinook salmon above Cougar Dam on the South Fork McKenzie River, Oregon, USA from 2008-2011. We found that mean reproductive success (RS) declined as adults were released later in the spawning season in 2009 and 2010; however release location did not affect RS. In 2010 and 2011, we tested for RS differences between hatchery and natural origin (HOR and NOR) adults. HOR males were consistently less fit than NOR males, but little evidence for fitness differences was apparent between HOR and NOR females. Interestingly, the effect of origin on RS was not significant after accounting for variation explained by body length. Our results indicate that release date and location have inconsistent or no effect on the reproductive success of reintroduced adults when active transport strategies are employed for migratory fishes.
  • This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Canadian Science Publishing, NRC Research Press and can be found at: http://www.nrcresearchpress.com/doi/10.1139/cjfas-2015-0007#.VuHGB3rci0j
  • Keywords: hatchery and natural origin, reproductive success, genetic parentage, reintroduction, active transport
  • Keywords: hatchery and natural origin, reproductive success, genetic parentage, reintroduction, active transport
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  • Sard, N. M., O’Malley, K. G., Jacobson, D. P., Hogansen, M. J., Johnson, M. A., & Banks, M. A. (2015). Factors influencing spawner success in a spring Chinook salmon (Oncorhynchus tshawytscha) reintroduction program. Canadian Journal of Fisheries and Aquatic Sciences, 72(9), 1390-1397. doi:10.1139/cjfas-2015-0007
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  • 72
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  • 9
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  • This work was funded by the U.S. Army Corps of Engineers, Portland District, with administrative assistance provided by David Griffith.
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