Evaluation and Statistical Review of Idaho Supplementation Studies :1991-2001.

Lutch, Jeffrey; Steinhorst, Kirk; Beasley, Chris

doi:10.2172/827649

Cited by 7 publications

(2 citation statements)

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“…Straying occurs when an adult salmon spawns in a nonnatal stream, or in the case of hatchery stocks, when an adult salmon of hatchery origin spawns naturally in a stream. Stray rates among naturally produced fish in the Salmon River are unknown, but stray rates can be very high for hatchery fish, as evidenced by the results of a study that identified 67% of the Chinook salmon carcasses recovered on spawning grounds of the South Fork of the Salmon River over a 7-year period, to be of hatchery origin (Lutch et al 2003). These strays probably originated from McCall Hatchery (HSRG 2009).…”

Section: Discussionmentioning

confidence: 99%

Genetic Monitoring Reveals Genetic Stability within and among Threatened Chinook Salmon Populations in the Salmon River, Idaho

Doornik

Waples

Baird

et al. 2011

N American J Fish Manag

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Identifying and understanding temporal genetic changes within fish populations is important for the management of these populations, especially those of conservation concern. Such changes are often the result of genetic drift, which can be exacerbated when the size of a population decreases. Using molecular‐genetics techniques, we monitored nine populations of Chinook salmon Oncorhynchus tshawytscha in the Salmon River, Idaho, to determine how the genetic characteristics within and among these populations have changed over time. We found no evidence of change in the level of heterozygosity or allelic richness over three to four generations in eight of the populations. This is probably due to the fact that the populations all maintained a sufficiently large effective size, even though a few of the populations did show a decline in effective size. Also, the genetic structure among the populations did not change appreciably over time. Populations that had been supplemented with hatchery‐reared fish showed genetic similarity to the within‐basin hatchery source population, presumably because of the extensive use of native fish for hatchery brood stocks and minimal out‐of‐basin stock transfers. The lack of a detectable decline in these populations’ levels of genetic diversity is encouraging, given the species’ threatened status under the U.S. Endangered Species Act.Received September 22, 2010; accepted December 8, 2010

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Section: Discussionmentioning

confidence: 99%

Genetic Monitoring Reveals Genetic Stability within and among Threatened Chinook Salmon Populations in the Salmon River, Idaho

Doornik

Waples

Baird

et al. 2011

N American J Fish Manag

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“…While this may have some bearing on our findings, this was a necessary compromise to maintain the integrity of our reference populations and reflects the reality that supplementation will often operate concurrently with harvest mitigation programs. For a complete account of the study design and data collection methodologies see Bowles and Leitzinger (1991), Lutch et al (2005), and Venditti et al (2015a).…”

Section: Methodsmentioning

confidence: 99%

Effects of hatchery supplementation on abundance and productivity of natural-origin Chinook salmon: two decades of evaluation and implications for conservation programs

Venditti

Kinzer

Apperson

et al. 2018

Can. J. Fish. Aquat. Sci.

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Hatchery supplementation has been developed to conserve salmonid populations and provide fisheries. We evaluated supplemented and reference Chinook salmon (Oncorhynchus tshawytscha) populations prior to, during, and after supplementation ceased for 22 years in two major drainages in Idaho, USA. Basin-level analyses showed supplementation increased abundance at some life stages, but effects did not persist into the postsupplementation phase and had no apparent influence on productivity. Natural-origin juvenile abundance increased during supplementation but results for adults were ambiguous. After supplementation ceased, abundance and productivity in supplemented and reference populations returned to their presupplementation relationships. Intensive analyses of supplemented populations with weirs showed abundance increased at some life stages with the addition of female spawners. However, the rate of increase varied with female origin (natural > supplementation ≥ nontreatment hatchery), and effects diminished through the life cycle. Based on these findings, we provide guidance for conservation programs. Supplementation alone is not a panacea because it does not correct limiting factors, which must be addressed to achieve population levels capable of sustaining ecological function and harvest.

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