Fort Peck paddlefish population survival and abundance in the Missouri River

Glassic, Hayley C.; Guy, Christopher S.; Rotella, Jay J.; Nagel, Cody J.; Schmetterling, David A.; Dalbey, Steven R.

doi:10.1111/jai.14067

Cited by 4 publications

(7 citation statements)

References 42 publications

(57 reference statements)

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“…The low total annual mortality rates observed in this study (A = 15% for males and 12% for females, including harvest) are very similar to the low rates for the stock estimated from jaw tag recoveries (18% for males and 8% for females; Glassic et al 2020). In both studies, females had higher survival.…”

Section: Mortality Ratessupporting

confidence: 82%

“…DEMOGRAPHICS OF AN ISOLATED PADDLEFISH STOCK TABLE 1. Age (years) summary for harvested Paddlefish of the Fort Peck stock, Montana, 1992-2020. Data were not collected in 1997, 1999, 2001, 2003 Von Bertalanffy growth curves indicated that females were much larger than males over comparable ages in terms of BL (Figure 5) and weight (Figure 6).…”

Section: Age and Growthmentioning

confidence: 99%

“…Such a population expansion after reservoir filling occurred in the better-monitored Yellowstone-Sakakawea stock, the next stock downriver, after the filling of Lake Sakakawea (Scarnecchia and Stewart 1996;Scarnecchia et al 2009). Efforts at population estimation for the Fort Peck stock have included recent Jolly-Seber estimates with POPAN parameterization by Glassic et al (2020) as well as Schnabel multiple mark-recapture estimates (D. L. Scarnecchia and coworkers, University of Idaho, unpublished data). Both approaches indicate a stock size for 2016-2020 of between 12,000 and 25,000 adult fish.…”

mentioning

confidence: 99%

“…The number of harvest tags annually allocated is designed to result in a harvest of about 500 fish (Scarnecchia et al 2021). Historical estimated natural and harvest mortality rates based on recoveries of jaw-tagged fish have been low (1973)(1974)(1975)(1976)(1977)(1978)(1979)(1980)(1981)(1982)(1983)(1984)(1985)(1986), harvest rates of 1.5-3.5%: Needham and Gilge 1986; harvest rates of 2.6% for females, 2.9% for males: Glassic et al 2020; annual total survival S = 0.92 for females, 0.82 for males: Glassic et al 2020).…”

mentioning

confidence: 99%

“…Sound management is of added importance because of increasing interest in Paddlefish snagging (Scarnecchia et al 2008;Nagel 2017) and potential illegal harvest for the species' caviar (De Meulenaer and Raymakers 1996;Williamson 2003). As part of MFWP's management plan for this stock (Scarnecchia et al 2021), key informational needs for stock population assessment include estimates of abundance (Glassic et al 2020), sex-specific age structure, growth rates, reproduction, and recruitment (Scarnecchia et al 2014(Scarnecchia et al , 2019a(Scarnecchia et al , 2019b.…”

mentioning

confidence: 99%

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Demographics and Management of the Isolated Upper Missouri River Paddlefish Stock of Fort Peck Reservoir, Montana

Scarnecchia

Nagel

Lim

et al. 2021

N American J Fish Manag

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Paddlefish Polyodon spathula inhabiting Fort Peck Reservoir and the upper Missouri River, Montana, are members of the northern-most and western-most isolated group of the species. These isolated fish support a recreational, river-based snag fishery on migratory adults. We provide population demographics for the Fort Peck Paddlefish stock, including age structure, growth, reproductive success, recruitment, and population trends developed from creel surveys, adult fish tagging, and reservoir surveys of age-0 and age-1 fish over the period 1992-2020. Of 5,108 fish (2,560 males; 2,558 females), mean annual male age ranged from 18.5 to 21.5 years; mean age of females ranged from 24.3 to 30.8 years. Males did not mature until at least 9-12 years, whereas females did not mature until at least ages 16-19. Females were longer and much heavier than males at a given age and throughout adult life. Males exhibited both annual and biennial spawning, whereas almost no females showed consecutive-year spawning but commonly showed biennial spawning. Annual survival rates estimated from cumulative catch curves were 85% for males and 88% for females. Low counts of age-0 and age-1 fish in the reservoir as well as the modest numbers of young male recruits to the fishery indicate that the Fort Peck stock is characterized by a fairly steady but modest recruitment. This isolated stock continues to be managed as a recreational fishery with harvest while maintaining adult population size, sex, and age structure consistent with its recruitment.The Paddlefish Polyodon spathula, an ancient, filterfeeding zooplanktivore of the Mississippi and Missouri River drainages (Russell 1986;Grande and Bemis 1991;Jennings and Zigler 2009), has declined in abundance in many portions of its range in the past century as a result of dams (Hoover et al. 2019), large-river habitat alterations (Sparrowe 1986), and overfishing (Bettoli et al. 2009). Peripheral declines (i.e., edges of the native range) have been especially obvious (Gengerke 1986). In peripheral locations, initial numbers were often lower than in

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Section: Mortality Ratessupporting

confidence: 82%

Section: Age and Growthmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Demographics and Management of the Isolated Upper Missouri River Paddlefish Stock of Fort Peck Reservoir, Montana

Scarnecchia

Nagel

Lim

et al. 2021

N American J Fish Manag

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A flexible Bayesian approach for estimating survival probabilities from age‐at‐harvest data

et al. 2023

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Understanding survival probabilities is critical for the sustainable harvest of wildlife and fisheries populations. Age‐ and stage class‐specific survival probabilities are needed to inform a suite of population models used to estimate abundance and track population trends. However, current techniques for estimating survival probabilities using age‐at‐harvest methods require restrictive assumptions or incorporate potentially unknown parameters within the model. Using a Bayesian approach, we developed a flexible age‐at‐harvest model that incorporates either age‐ or stage‐structured populations, while accounting for uncertainty in age structure, population growth rates and relative selectivity. Survival probabilities can vary by age or stage class, as well as by environmental covariates, and both population growth rates and selectivity for each age or stage class can be specified as fixed and known or these parameters can be specified as informative priors, allowing for the incorporation of expert opinion. We evaluated our model with simulations and empirical data from harvested bobcats Lynx rufus and American paddlefish Polyodon spathula. Models fit to simulated age‐at‐harvest data yielded unbiased estimates of survival probability when population growth rates and selectivity were centered on the data‐generating parameter. We obtained unbiased estimates of survival probability even with biased prior estimates of selectivity and random departures from the assumed stage distribution, although the latter increased uncertainty in those estimates. We found biased estimates of survival probability when the prior distribution for population growth rate was not centered on the data‐generating value. When fit to empirical harvest data, our proposed age‐at‐harvest model produced estimates of survival probability congruent to those reported in the literature within similar geographic regions. We demonstrate the utility of a novel age‐at‐harvest model that estimates survival probability and realistically account for uncertainty in model parameters, transcending the restrictive assumptions and auxiliary data requirements of other methods. Furthermore, we advise collecting information about population trends and age structure alongside age‐at‐harvest data to help reduce bias. Although our model cannot replace more rigorous methods, we believe our model will be transformative for wildlife and fisheries practitioners who collect age‐at‐harvest data to estimate age‐ or stage‐specific survival probabilities to help inform management decisions.

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Factors affecting the catch and harvest rates of paddlefish downstream of Gavins Point Dam, South Dakota, 2000–2020

Radigan

Fopma

Sorensen

et al. 2022

Fisheries Management Eco

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The North American paddlefish Polyodon spathula (Walbaum) is likely the only remaining extant species of paddlefish because the Chinese paddlefish Psephurus gladius (Martens) likely went extinct between and 2010(Zhang et al., 2020. Globally, paddlefish are among the most commercially valuable species of fishes (Gessner et al., 2013), and paddlefish are imperiled worldwide due to growing black caviar markets (Onders & Mims, 2015;Pikitch et al., 2005) and overfishing (Glassic et al., 2020;Jennings & Zigler, 2000). In the United States, paddlefish are native to lotic systems, such as both the Missouri and Mississippi River basins (Carlson

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Fort Peck paddlefish population survival and abundance in the Missouri River

Cited by 4 publications

References 42 publications

Demographics and Management of the Isolated Upper Missouri River Paddlefish Stock of Fort Peck Reservoir, Montana

Demographics and Management of the Isolated Upper Missouri River Paddlefish Stock of Fort Peck Reservoir, Montana

A flexible Bayesian approach for estimating survival probabilities from age‐at‐harvest data

Factors affecting the catch and harvest rates of paddlefish downstream of Gavins Point Dam, South Dakota, 2000–2020

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