Population characteristics of bighead and silver carp on the northwestern front of their North American invasion

Hayer, Cari‐Ann; Breeggemann, Jason J.; Klumb, Robert A.; Graeb, Brian D. S.; Bertrand, Katie N.

doi:10.3391/ai.2014.9.3.05

Cited by 46 publications

(37 citation statements)

References 46 publications

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“…In other studies, similar patterns have been qualitatively discussed (Hayer et al. ) as well as the combination of high discharges and temperatures above 17°C in the upper Mississippi River promoting strong year‐classes (Garvey et al. ; DeGrandchamp et al.…”

Section: Discussionsupporting

confidence: 69%

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Factors Regulating Year‐Class Strength of Silver Carp Throughout the Mississippi River Basin

et al. 2018

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Recruitment of many fish populations is inherently highly variable interannually. However, this variability can be synchronous at broad geographic scales due to fish dispersal and climatic conditions. Herein, we investigated recruitment synchrony of Silver Carp Hypophthalmichthys molitrix across the Mississippi River basin. Year‐class strength (YCS) and synchrony of nine populations (maximum linear distance = 806.4 km) were indexed using catch‐curve residuals correlated between sites and related to local and regional climatic conditions. Overall, Silver Carp YCS was not synchronous among populations, suggesting that local environmental factors are more important determinants of YCS than large‐scale environmental factors. Variation in Silver Carp YCS was influenced by river base flow and discharge variability at each site, indicating that extended periods of static local discharge benefit YCS. Furthermore, river discharge and air temperature were correlated and synchronized among sites, but only similarities in river discharge were correlated with Silver Carp population synchrony, indicating that similarities in discharge (i.e., major flood) among sites can positively synchronize Silver Carp YCS. The positive correlation between Silver Carp YCS and river discharge synchrony suggests that regional flood regimes are an important force determining the degree of population synchrony among Mississippi River Silver Carp populations.

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Section: Discussionsupporting

confidence: 69%

“…), and processes such as source–sink dynamics are thought to regulate populations (Hayer et al. ). Thus, fish dispersal from downstream to upstream habitats may synchronize recruitment at local scales (i.e., <70 km; Prechtel et al.…”

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confidence: 99%

Factors Regulating Year‐Class Strength of Silver Carp Throughout the Mississippi River Basin

et al. 2018

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“…; Klumb ; Hayer et al. ). Silver Carp pose a major threat to the native biota found in river basins (Kolar et al.…”

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confidence: 99%

A Comparison between Conventional Boat Electrofishing and the Electrified Dozer Trawl for Capturing Silver Carp in Tributaries of the Missouri River, Missouri

Hammen

Pherigo

Doyle

et al. 2019

N American J Fish Manag

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Silver Carp Hypophthalmichthys molitrix are elusive fish that can be difficult to capture with conventional management tools. New tools must be developed to help increase the capture of Silver Carp, thereby improving the understanding and management of the species. An electrified dozer trawl was developed in an attempt to increase the capture of Silver Carp while reducing the amount of sampling effort needed to successfully assess a population and inform management actions. We compared Silver Carp catch rates, sample run time, and Silver Carp length frequency distributions from the electrified dozer trawl with those from conventional boat electrofishing. Silver Carp capture was greater and sample time was shorter for the electrified dozer trawl compared to conventional boat electrofishing. Length frequency distributions were similar between gears. The electrified dozer trawl can shorten sample run times and potentially improve Silver Carp capture, thus facilitating management. Use of the electrified dozer trawl should be expanded beyond Missouri River tributaries to further understand the gear's potential for sampling Silver Carp in a diverse array of environments.

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“…Seasonal sampling variation has been documented for various freshwater fishes, with higher catches generally reported during spring and fall in response to environmental conditions (Pope and Willis 1996). Substantial research has been devoted to documenting Silver Carp expansion and subsequent increases in density (e.g., Irons et al 2007;Hayer et al 2014a). However, information on Silver Carp seasonal sampling variation in relation to environmental conditions is lacking.…”

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Intra‐Annual Variability of Silver Carp Populations in the Des Moines River, USA

Sullivan

Camacho

Weber

et al. 2017

N American J Fish Manag

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Since their introduction in the 1970s, Silver Carp Hypophthalmichthys molitrix have spread throughout the Mississippi River basin. Management of any species relies on an accurate understanding of population characteristics and dynamics. However, Silver Carp seasonal sampling variation is unknown. Sampling during periods of peak catch rates would facilitate Silver Carp assessment and management, improving monitoring and removal techniques. The objective of this study was to evaluate adult Silver Carp seasonal sampling variation with boat electroshocking and trammel nets. Silver Carp were collected monthly (April–October) during 2014 and 2015 from four locations in the Des Moines River, Iowa. Trammel nets rarely captured Silver Carp (mean ± SE = 4.9 ± 1.6 fish/net; 60% of fish were captured in 6.3% of net sets) and therefore were not included in analyses. Electroshocking catch rates (CPUEs) exhibited a bimodal distribution, with peak CPUEs generally occurring in May, June, and September and lower catch rates observed during July and August. Catch rates were positively related to river discharge at upstream sites but not at downstream sites. Silver Carp size structure was similar among months and sites except at Cliffland, where fish were smaller during August and October compared to earlier in the year. Finally, Silver Carp condition peaked during April and May and decreased throughout the year except at Keokuk, where peaks were observed during both May and August. Although spatiotemporal variability was substantial, these results suggest that sampling of Silver Carp via electroshocking in May–June and September–October generally produces higher catch rates compared to July–August sampling and generates a more representative size structure. Using site‐specific knowledge, monitoring and surveillance programs could more effectively sample during these periods of high vulnerability and densities in order to manage the spread and impacts of Silver Carp at statewide and regionwide scales. Received December 7, 2016; accepted May 11, 2017Published online June 30, 2017

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Population characteristics of bighead and silver carp on the northwestern front of their North American invasion

Cited by 46 publications

References 46 publications

Factors Regulating Year‐Class Strength of Silver Carp Throughout the Mississippi River Basin

Factors Regulating Year‐Class Strength of Silver Carp Throughout the Mississippi River Basin

A Comparison between Conventional Boat Electrofishing and the Electrified Dozer Trawl for Capturing Silver Carp in Tributaries of the Missouri River, Missouri

Intra‐Annual Variability of Silver Carp Populations in the Des Moines River, USA

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