Estimating Ages of Utah Chubs by Use of Pectoral Fin Rays, Otoliths, and Scales

Griffin, Kayla M.; Beard, Zachary S.; Flinders, John M.; Quist, Michael C.

doi:10.3398/064.077.0206

Cited by 2 publications

(7 citation statements)

References 18 publications

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“…Average depth in Henrys Lake is about 4 m, with a maximum depth of around 6 m. The lake supports a renowned trophy salmonid fishery for Brook Trout, Rainbow Trout × Yellowstone Cutthroat Trout O. clarkii bouvieri hybrids, and Yellowstone Cutthroat Trout (Griffin et al. ).…”

Section: Methodsmentioning

confidence: 95%

“…Utah Chub commonly live 5–8 years but have been documented to live over 12 years (Sigler and Sigler ; Griffin et al. ; A. Ward, Utah Division of Wildlife Resources, personal communication).…”

Section: Methodsmentioning

confidence: 99%

“…The black circles represent the locations where gill nets were set. × Yellowstone Cutthroat Trout O. clarkii bouvieri hybrids, and Yellowstone Cutthroat Trout (Griffin et al 2017).…”

Section: Methodsmentioning

confidence: 99%

“…Utah Chub are native to the upper Snake River, Idaho and Wyoming, and the Lake Bonneville basin, Utah (Sigler and Sigler 1996). Utah Chub commonly live 5-8 years but have been documented to live over 12 years (Sigler and Sigler 1996;Griffin et al 2017;A. Ward, Utah Division of Wildlife Resources, personal communication).…”

Section: Methodsmentioning

confidence: 99%

“…Three sinking gill nets and three floating nets were set at dusk and fished for 12 h. Collected fish were measured for TL (mm) and were weighed (g). The leading left pectoral fin was removed as close to the pectoral girdle as possible for all fish (Koch et al 2008;Griffin et al 2017). Fin rays were stored in paper coin envelopes and allowed to air dry.…”

Section: Methodsmentioning

confidence: 99%

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Population Ecology and Evaluation of Suppression Scenarios for Introduced Utah Chub

Roth

Beard

Flinders

et al. 2020

N American J Fish Manag

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Introduced Utah Chub Gila atraria were first sampled in Henrys Lake, Idaho, in 1993, and their presence in the system is a concern given possible interactions with sport fishes. Our objective was to describe the population dynamics of Utah Chub in Henrys Lake. A total of 362 Utah Chub was sampled via gill nets, with an average catch rate of 20.5 fish/net‐night (SE = 6.0) during May 2016. Average TL was 210 mm (SE = 3), and average weight was 134 g (SE = 5). Pectoral fin rays were used to provide estimates of growth and age structure. Utah Chub varied in age from 2 to 12 years, and recruitment was stable (recruitment coefficient of determination = 0.96). Estimated total annual mortality was 40% (SE = 4%). Fecundity of Utah Chub in Henrys Lake increased with length and varied from 6,232 to 156,797 eggs/female. Age‐structured population models were constructed using the demographics data, and estimated average population growth rate over a 10‐year period was 1.17. This study provides a comprehensive description of Utah Chub population dynamics and insight on their management in systems where they are not native. This information is not only useful for guiding management actions but also serves to further our understanding of Utah Chub ecology.

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Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

“…The black circles represent the locations where gill nets were set. × Yellowstone Cutthroat Trout O. clarkii bouvieri hybrids, and Yellowstone Cutthroat Trout (Griffin et al 2017).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Population Ecology and Evaluation of Suppression Scenarios for Introduced Utah Chub

Roth

Beard

Flinders

et al. 2020

N American J Fish Manag

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Proposed Standard Weight (W_s) Equation and Length Categories for Utah Chub

Black

Beard

Flinders

et al. 2021

N American J Fish Manag

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Condition indices, such as relative weight (Wr), provide a simple method for comparing length–weight relationships among populations. However, no standard weight (Ws) equation has been developed for Utah Chub Gila atraria, a species of important management focus in the Intermountain West. We obtained length–weight data for 30,541 Utah Chub from 24 populations in Idaho, Montana, Utah, and Wyoming. We used the regression line percentile (RLP), linear empirical percentile (EmP), and quadratic EmP methods to develop average (50th percentile) and above average (75th percentile) Ws equations. Additionally, Froese’s method was used to develop another Ws equation for Utah Chub. Length‐related biases were detected in Ws equations developed using the RLP, 50th percentile quadratic EmP, and Froese methods. The linear EmP Ws equations did not exhibit length‐related biases for the 50th and 75th percentiles. We propose using the 75th percentile linear EmP Ws equation for Utah Chub between 90 and 410 mm TL. The EmP 75th percentile equation was log10(Ws) = −4.938 + 3.031·log10(TL), where Ws is weight in grams and TL is in millimeters. The English equivalent of this equation is log10(Ws) = −3.335 + 3.031·log10(TL), where Ws is weight in pounds and TL is in inches for 4–16‐in Utah Chub. Additionally, we propose that minimum TLs of 100 mm (4 in; stock), 200 mm (8 in; quality), 250 mm (10 in; preferred), 300 mm (12 in; memorable), and 380 mm (15 in; trophy) be used to calculate proportional size distribution (PSD) indices. Better understanding Utah Chub populations using Wr and PSDs will aid managers in assessing management strategies (e.g., biological controls) focused on Utah Chub.

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Estimating Ages of Utah Chubs by Use of Pectoral Fin Rays, Otoliths, and Scales

Cited by 2 publications

References 18 publications

Population Ecology and Evaluation of Suppression Scenarios for Introduced Utah Chub

Population Ecology and Evaluation of Suppression Scenarios for Introduced Utah Chub

Proposed Standard Weight (W_s) Equation and Length Categories for Utah Chub

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Estimating Ages of Utah Chubs by Use of Pectoral Fin Rays, Otoliths, and Scales

Cited by 2 publications

References 18 publications

Population Ecology and Evaluation of Suppression Scenarios for Introduced Utah Chub

Population Ecology and Evaluation of Suppression Scenarios for Introduced Utah Chub

Proposed Standard Weight (Ws) Equation and Length Categories for Utah Chub

Contact Info

Product

Resources

About

Proposed Standard Weight (W_s) Equation and Length Categories for Utah Chub