Standard Weight (<i>W<sub>s</sub></i>) Equation and Length Categories for Shovelnose Sturgeon

Quist, Michael C.; Guy, Christopher S.; Braaten, Patrick J.

doi:10.1577/1548-8675(1998)018<0992:swwsea>2.0.co;2

Cited by 27 publications

(43 citation statements)

References 18 publications

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“…Regardless, other studies have also reported difficulties sampling small shovelnose sturgeon, which has commonly led to high size structure indices reported for shovelnose sturgeon populations. For instance, Quist et al (1998) analyzed data from 32 populations of shovelnose sturgeon and reported that 31 populations had a PSD greater than 79. Hamel and Steffensen (2006) reported that no gears (e.g., gill nets, trammel nets, otter trawls) were effective at sampling substock (i.e., ≤ 249 mm) and stock-length (i.e., 250-379 mm) shovelnose sturgeon in the Missouri River.…”

Section: Discussionmentioning

confidence: 99%

“…Fecundity was estimated by weighing and counting three subsamples of eggs from each third of both preserved ovaries (i.e., eighteen subsamples per fish). where W s is the length-specific standard weight in grams and FL is fork length in millimeters (Quist et al 1998). Size structure of shovelnose sturgeon sampled from each pool was assessed using proportional size distributions (PSDs; Anderson and Neumann 1996;Guy et al 2007;Neumann and Allen 2007).…”

Section: Methodsmentioning

confidence: 99%

“…Size structure of shovelnose sturgeon sampled from each pool was assessed using proportional size distributions (PSDs; Anderson and Neumann 1996;Guy et al 2007;Neumann and Allen 2007). Proportional size distribution was calculated as the number of fish greater than or equal to quality length (380 mm) divided by the number of fish greater than or equal to stock length (250 mm; Quist et al 1998). Additional proportional size distribution indices were calculated as the number of fish greater than or equal to a specified length divided by the number of stock-length fish.…”

Section: Methodsmentioning

confidence: 99%

“…Additional proportional size distribution indices were calculated as the number of fish greater than or equal to a specified length divided by the number of stock-length fish. Specified lengths included preferred (PSD-P; 510 mm), memorable (PSD-M; 640 mm), and trophy lengths (PSD-T; 810 mm; Quist et al 1998). Subsampled age data were extrapolated to the entire sample using an age-length key (DeVries and Frie 1996).…”

Section: Methodsmentioning

confidence: 99%

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Effects of Commercial Harvest on Shovelnose Sturgeon Populations in the Upper Mississippi River

Koch

Quist

Pierce

et al. 2009

N American J Fish Manag

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Shovelnose sturgeon Scaphirhynchus platorynchus have become an increasingly important commercial species in the upper Mississippi River (UMR) because of the collapse of foreign sturgeon (family Acipenseridae) populations and bans on imported caviar. In response to concerns about the sustainability of the commercial shovelnose sturgeon fishery in the UMR, we undertook this study to describe the demographics of the shovelnose sturgeon population and evaluate the influence of commercial harvest on shovelnose sturgeon populations in the UMR. A total of 1,682 shovelnose sturgeon were collected from eight study pools in 2006 and 2007 (Pools 4, 7, 9, 11, 13, 14, 16, and 18). Shovelnose sturgeon from upstream pools generally had greater lengths, weights, and ages than those from downstream pools. Additionally, mortality estimates were lower in upstream pools (Pools 4, 7, 9, and 11) than in downstream pools (Pools 13, 14, 16, and 18). Linear regression suggested that the slower growth of shovelnose sturgeon is a consequence of commercial harvest in the UMR. Modeling of potential management scenarios suggested that a 685‐mm minimum length limit is necessary to prevent growth and recruitment overfishing of shovelnose sturgeon in the UMR.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effects of Commercial Harvest on Shovelnose Sturgeon Populations in the Upper Mississippi River

Koch

Quist

Pierce

et al. 2009

N American J Fish Manag

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“…However, it is unknown what the mean condition factor should be for pallid sturgeon. Quist et al (1998) suggested relative weight target values between 80 and 90 for the sympatric shovelnose sturgeon (Scaphirhynchus platorynchus) excluding the large adults found in Montana. Although fairly similar in body shape, this recommendation may not be valid for the piscivorous pallid sturgeon, especially for the larger PSD size classes (i.e.…”

Section: Discussionmentioning

confidence: 99%

Assessment of pallid sturgeon relative condition in the upper channelized Missouri River

Steffensen

Mestl

2016

Journal of Freshwater Ecology

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During the spring 2015 sampling efforts on the Missouri River, several adult pallid sturgeon (Scaphirhynchus albus) were captured in a visually emaciated condition. As pallid sturgeon recovery efforts continue throughout the Missouri River, this may negatively impact the local population and hamper recovery. Therefore, the objectives were to (1) assess the annual variation in pallid sturgeon condition, (2) determine how condition varies amongst gender and reproductive status and if condition affects fecundity, (3) determine the annual proportion of reproductive female pallid sturgeon, and (4) test several hypothesized factors which may contribute to variations in pallid sturgeon condition. Overall, the relative condition of pallid sturgeon has significantly declined over the past 12 years, except for the large adult-sized fish (> 840 mm fork length). Pallid sturgeon condition began to decline in 2013 then rapidly declined in 2014 and even more in 2015. The mean annual pallid sturgeon condition reached record lows in 2015. Females had a higher overall Kn compared to males and sexually reproductive fish had a significantly higher Kn for both genders. Overall, 28% of the females captured have been in reproductive condition; however, that frequency appears to be declining with condition. Also, relative condition was not correlated with the number of eggs released by reproductively ready females. Correlation between pallid sturgeon condition and hypothesized variables did not result in any statistically significant relationships that would explain the variations in pallid sturgeon condition. As pallid sturgeon recovery continues throughout the lower Missouri River, concern arises over whether or not the current habitat available and river management can support a viable pallid sturgeon population.

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Population Characteristics of Shovelnose Sturgeon During Low‐ and High‐Water Conditions in the Lower Platte River, Nebraska

Hammen

Hamel

Rugg

et al. 2018

N American J Fish Manag

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Cycles of low‐ and high‐water periods (i.e., years) in river systems are natural occurrences, but a clear understanding of how cyclical climatological patterns affect fishes, especially long‐lived species, is lacking. We compared Shovelnose Sturgeon Scaphirhynchus platorynchus population dynamics between a low‐water period (2001–2004) and a high‐water period (2009–2012) in the lower Platte River, Nebraska. Low‐flow periods in the lower Platte River can cause disconnections between upstream and downstream reaches, resulting in isolated pools and elevated water temperatures that create stressful situations for aquatic life and potentially lead to mortality. Our data showed no measurable differences in key population indices between flow condition periods, which is consistent with current paradigms for long‐lived fish species. Shovelnose Sturgeon relative weights were generally greater than 80 during both low‐ and high‐water periods, and size structure did not differ between the two periods. Shovelnose Sturgeon abundances, however, were significantly greater during high‐water conditions compared to low‐water conditions. Shovelnose Sturgeon may have migrated to more suitable habitats during low‐water periods to seek refuge, later returning after conditions improved. Shovelnose Sturgeon and other riverine fishes have evolved in a variable environment and have been able to endure relatively minor anthropogenic changes within the lower Platte River. Rivers like the lower Platte River that have retained much of their original physical features and flow regimes are likely key components for the resistance and resilience of riverine species. However, as alterations to landscapes continue, and given the uncertainty surrounding future climate predictions, it is unknown how these riverine species will be able to adapt to future changes. Reducing anthropogenic changes that disrupt flow regimes and increasing connectivity among river systems could provide greater amounts of refuge for fish during stressful conditions, thus helping to protect these riverine species.

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Standard Weight (W_s) Equation and Length Categories for Shovelnose Sturgeon

Cited by 27 publications

References 18 publications

Effects of Commercial Harvest on Shovelnose Sturgeon Populations in the Upper Mississippi River

Effects of Commercial Harvest on Shovelnose Sturgeon Populations in the Upper Mississippi River

Assessment of pallid sturgeon relative condition in the upper channelized Missouri River

Population Characteristics of Shovelnose Sturgeon During Low‐ and High‐Water Conditions in the Lower Platte River, Nebraska

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Standard Weight (Ws) Equation and Length Categories for Shovelnose Sturgeon

Cited by 27 publications

References 18 publications

Effects of Commercial Harvest on Shovelnose Sturgeon Populations in the Upper Mississippi River

Effects of Commercial Harvest on Shovelnose Sturgeon Populations in the Upper Mississippi River

Assessment of pallid sturgeon relative condition in the upper channelized Missouri River

Population Characteristics of Shovelnose Sturgeon During Low‐ and High‐Water Conditions in the Lower Platte River, Nebraska

Contact Info

Product

Resources

About

Standard Weight (W_s) Equation and Length Categories for Shovelnose Sturgeon