2016
DOI: 10.7755/fb.115.1.1
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Abundance estimates and confidence intervals for the run composition of returning salmonids

Abstract: Abstract-In 2-stage fishery sampling, abundance is often estimated by using a primary sampling gear and total abundance is then partitioned into groups of interest by applying data on composition derived from a secondary sampling gear. However, the literature is sparse on statistical properties of estimates of run composition. We examined the accuracy and precision of estimators of composition of wild steelhead (Oncorhynchus mykiss) in the Snake River, in the Pacific Northwest. We simulated estimators, using p… Show more

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Cited by 7 publications
(17 citation statements)
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“…A daily abundance estimate (Whitlock, Deweber, & Peterson, 2019) was used to expand candidate SNP genotypic proportions in the weekly strata. We estimated the abundance and 95% confidence intervals of the candidate genotypes using a bootstrapping method (Steinhorst, Copeland, Ackerman, Schrader, & Anderson, 2017) that was automated in R for a broad set of fisheries applications that require stratified sampling (Thomas Delomas, PSMFC/IDFG, https://github.com/delomast/fishCompTools)". One biological complexity was that a portion of the adults encountered before May probably overwintered and experienced shrinkage in body size due to advanced maturation (Beamish, 1980).…”
Section: Methodsmentioning
confidence: 99%
“…A daily abundance estimate (Whitlock, Deweber, & Peterson, 2019) was used to expand candidate SNP genotypic proportions in the weekly strata. We estimated the abundance and 95% confidence intervals of the candidate genotypes using a bootstrapping method (Steinhorst, Copeland, Ackerman, Schrader, & Anderson, 2017) that was automated in R for a broad set of fisheries applications that require stratified sampling (Thomas Delomas, PSMFC/IDFG, https://github.com/delomast/fishCompTools)". One biological complexity was that a portion of the adults encountered before May probably overwintered and experienced shrinkage in body size due to advanced maturation (Beamish, 1980).…”
Section: Methodsmentioning
confidence: 99%
“…Samples were collected at a trap located on the Lower Granite Dam adult fish ladder (Steinhorst et al. ). The trap is operational 24 h/d, and a trap gate opens 4 times/h such that a daily systematic sample (by time) is taken from the fish ascending the fish ladder.…”
Section: Methodsmentioning
confidence: 99%
“…Steinhorst et al. () provide additional details about the program and adult trap operations at Lower Granite Dam. Repeat spawners collected in the systematic sample of upstream‐migrating steelhead were identified by scale analysis.…”
Section: Methodsmentioning
confidence: 99%
“…In both scenarios, escapement estimates were generated by multiplying the trapping proportions of each rearing type for each stratum by the window count for that stratum and summing over the season. A parametric bootstrap was used to find confidence intervals on the estimated escapement of the different categories (scenario 1: H, N, and HNC without PBT; scenario 2: H, N, and HNC with PBT) (Steinhorst et al 2017). The parametric bootstrap used the number of adults trapped in each stratum along with the estimated multinomial proportions for rearing type in that stratum to produce bootstrap pseudo-values for numbers of fish by rearing category.…”
Section: Adult Escapement By Originmentioning
confidence: 99%
“…Biological data includes observations of marks and tags that are used to indicate whether a fish is of natural or hatchery origin and tissue for genetic analysis which identifies sex (via a sex-linked marker) and genetic stock of origin the within the Snake River basin (Camacho et al 2019). Window counts and trap data and are then combined to estimate escapement of Chinook Salmon and Steelhead by size, genetic stock, and source of origin: natural or hatchery (adipose clipped and unclipped) (Steinhorst et al 2017;Camacho et al 2019). Accurate estimates of escapement for natural-origin salmon and Steelhead basin-wide as well as decomposed by genetic stock and sex is of critical importance to conservation and management efforts (Wainwright and Kope 1999;Chasco et al 2014;Hess et al 2014) as these data represent at least two of four key parameters that are presently used to assess salmonid population viability and ESA status (population abundance, growth rate, spatial structure, diversity; McElhany et al 2000).…”
Section: Introductionmentioning
confidence: 99%