Virtual Population Analysis, Episodic Recruitment, and Harvest Management of Paddlefish with Applications to Other Acipenseriform Fishes

Scarnecchia, Dennis L.; Lim, Youngtaik; Ryckman, L. Fred; Backes, K. Michael; Miller, Shannon E.; Gangl, R. Scott; Schmitz, Brad J.

doi:10.1080/10641262.2013.830592

Cited by 19 publications

(36 citation statements)

References 27 publications

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“…shoreline of 2,120 km. The reservoir level has fluctuated by as much as 8 m since filling, depending on drought and flood conditions (Scarnecchia et al., ).…”

Section: Methodsmentioning

confidence: 99%

“…Some northern and southern stocks have been shown to exhibit highly episodic recruitment (Scarnecchia et al., ). The causes of the highly differential success in year‐class strength are thought to be related to river discharges and reservoir levels (higher water levels and trophic upsurge; Scarnecchia et al., , ).…”

Section: Introductionmentioning

confidence: 99%

“…For effective management of these two stocks and others, the underlying factors that lead to differential age‐0 survival and recruitment, perhaps involving energy acquisition, use, and associated food web factors (e.g. competition, predation; Scarnecchia et al., ), need to be much better understood.…”

Section: Introductionmentioning

confidence: 99%

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Energy acquisition and retention by age-0 and age-1 paddlefishPolyodon spathula(Walbaum, 1792) in relation to size, growth, and rearing conditions in two Great Plains reservoirs and hatchery ponds

Hemingway¹,

Scarnecchia

2016

J. Appl. Ichthyol.

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The objective of this study was to investigate lipid accumulation and storage in age-0 and age-1 paddlefish Polyodon spathula (Walbaum, 1792) in relation to age, stock,year, and growth. Juvenile paddlefish were collected from three locations in North Dakota and Montana, USA, during July and August of 2011 and 2012 and proximate analysis was used to determine lipid content. RNA/DNA ratios were used as an index of growth rates. Differences in age-based lipid accumulation and storage in juvenile paddlefish suggest a split allocation between growth and lipid storage, with growth being the highest initial priority and emphasis on energy storage occurring at a larger size, later in life. Differences in lipid allocation between stocks indicate that allocation is influenced by hatchery/wild rearing conditions. Differences within and betweenyear-classes are consistent with field evidence observed in 2012 of a strong 2011 yearclass, and indicate that during productive times, paddlefish may allocate energy to both body growth and lipid reserves, and that allocation differs among years. The lack of a relationship between RNA/DNA ratio and lipid does not support a physiologically exclusive allocation strategy between growth and lipid. Evidence from this and other studies suggests rather that an emphasis on growth, some energy storage, and a large rostrum size in relation to overall fish length in age-0 and age-1 fish, may be adaptive in avoiding predation while accruing necessary energy reserves for overwintering.Although this study also provides reference information regarding proximate composition of wild and hatchery origin juvenile paddlefish, much more study is needed into the relationships among growth, low and high lipid groups, lipid allocation in juvenile paddlefish as well as the existence and timing of allocation changes between growth and storage. To aid in understanding paddlefish survival and year-class strengths, these relationships also need to be linked to inter-annual differences in early rearing environments for age-0 and age-1 fish.

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“…shoreline of 2,120 km. The reservoir level has fluctuated by as much as 8 m since filling, depending on drought and flood conditions (Scarnecchia et al., ).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy acquisition and retention by age-0 and age-1 paddlefishPolyodon spathula(Walbaum, 1792) in relation to size, growth, and rearing conditions in two Great Plains reservoirs and hatchery ponds

Hemingway¹,

Scarnecchia

2016

J. Appl. Ichthyol.

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“…Species declines throughout the range have resulted, in part, from habitat loss or fragmentation due to dams, which can prevent access to upstream habitats or result in sedimentation of habitats for reservoir stocks (Sparrowe, ). For stocks with unrestricted access to natural rivers and associated spawning habitats, springtime river discharge and benthic habitat form a critical role in episodic recruitment of the species, where recruitment success is cyclical or variable and closely aligned with opportunistic hydrological events (Braaten, Fuller, & Lott, ; Scarnecchia et al., ; Schooley, Scarnecchia, & Crews, ).…”

Section: Introductionmentioning

confidence: 99%

“…For stocks with unrestricted access to natural rivers and associated spawning habitats, springtime river discharge and benthic habitat form a critical role in episodic recruitment of the species, where recruitment success is cyclical or variable and closely aligned with opportunistic hydrological events (Braaten, Fuller, & Lott, 2009;Scarnecchia et al, 2014;Schooley, Scarnecchia, & Crews, 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimation of paddlefish (Polyodon spathulaWalbaum, 1792) spawning habitat availability with consumer-grade sonar

Schooley¹,

Neely

2017

J Appl Ichthyol

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Summary The paddlefish (Polyodon spathula Walbaum, 1792) is a springtime migrant that requires discrete abiotic conditions such as water temperature, discharge, and substrate composition for successful spawning and recruitment. Although population declines have prevailed throughout much of the species range, Oklahoma paddlefish are abundant and support popular recreational snag fisheries – most notably in Grand Lake. This stock utilizes the Grand Lake's two primary headwaters, the Neosho and Spring rivers, with only episodic recruitment success. However, relationships between suitable spawning habitat and water level have not been evaluated in this system. Using consumer‐grade sonar equipment, this study identified and quantified hard river substrates (such as cobble and bedrock) and investigated proportional habitat availability at a variety of simulated river conditions. Sonar data were used to construct 49‐m2 grids of depth and bottom hardness (H) ranging from 0.0 (soft) ‐ 0.5 (hard). Ground‐truthing samples of bottom composition were collected with a grab sampler and by visual identification. Substrate types were pooled into two categories: soft substrates (H < 0.386) and spawning substrates (H ≥ 0.386) allowing for estimation of available spawning habitat in each river. Spawning habitat comprised 69% of total available habitat for the Neosho River (6.5 ha/km) and 58% for the Spring River (7.9 ha/km). Estimated spawning habitat was simulated over a range of river stages and predictive models were developed to estimate proportional spawning habitat availability (PHA). Although the Spring River contains more concentrated spawning habitat in closer proximity to Grand Lake, the Neosho River contains a greater quantity over nearly twice the distance to the first migration barrier, has a larger watershed, and demonstrates greater PHA at lower river stages. Model results were validated in context of known high and low recruitment years, where a greater frequency and duration of days with ≥90% PHA were observed in good recruitment years, particularly in the Neosho River. In total, results suggest the Neosho River has greater value for paddlefish reproduction than the Spring River. Research‐informed harvest management will remain critical to the conservation of wild‐recruiting stocks for continued recreational use in Oklahoma.

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Fisheries Volume 47 Number 9 September 2022

2022

Fisheries

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Virtual Population Analysis, Episodic Recruitment, and Harvest Management of Paddlefish with Applications to Other Acipenseriform Fishes

Cited by 19 publications

References 27 publications

Energy acquisition and retention by age-0 and age-1 paddlefishPolyodon spathula(Walbaum, 1792) in relation to size, growth, and rearing conditions in two Great Plains reservoirs and hatchery ponds

Energy acquisition and retention by age-0 and age-1 paddlefishPolyodon spathula(Walbaum, 1792) in relation to size, growth, and rearing conditions in two Great Plains reservoirs and hatchery ponds

Estimation of paddlefish (Polyodon spathulaWalbaum, 1792) spawning habitat availability with consumer-grade sonar

Fisheries Volume 47 Number 9 September 2022

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